Truck Preventive Maintenance Schedule Guide

Preventive maintenance is the single most important thing you can do for your truck. I’m not saying that because I’m a mechanic trying to sell you services — I’m saying it because I see the consequences of skipped PMs every single day. I’m Albert, owner of Albert’s Road Service in West Palm Beach, and the difference between a well-maintained truck and a neglected one is the difference between a reliable money-maker and a roadside nightmare.

The industry standard PM system uses three tiers — PM A, PM B, and PM C — with increasing depth and scope at each level. Here’s the complete guide, adjusted for Florida’s climate, which is harder on trucks than any cold-weather state.

Why Florida Demands Shorter PM Intervals

Before I get into the schedule, you need to understand why I recommend shorter intervals for trucks operating in South Florida:

Extreme heat — Ambient temperatures of 90-100°F from May through October mean your engine, transmission, and cooling system operate closer to their thermal limits every day. Oil breaks down faster. Coolant additives deplete faster. Rubber components (hoses, belts, seals) degrade faster.
Humidity — South Florida’s humidity averages 75%+ year-round. This accelerates corrosion on electrical connectors, brake components, and frame hardware. It also introduces moisture into fuel and air systems.
Salt air — Within 20 miles of the coast (which includes most of Palm Beach County), salt air attacks everything metal. Brake drums, frame rails, electrical connections, and exhaust components corrode at 2-3x the rate of inland trucks.
Stop-and-go traffic — I-95 and the Florida Turnpike through South Florida have some of the worst congestion in the country. Frequent braking and idling increase wear on brakes, cooling systems, and transmissions.
No winter break — In northern states, many trucks get reduced usage during winter. In Florida, trucks run hard 12 months a year. There’s no rest period for components.

My recommendation: reduce standard PM intervals by 20-25% for trucks primarily operating in South Florida. A PM A that’s normally done at 25,000 miles should be done at 18,000-20,000 miles. Here’s the full breakdown.

PM A — Basic Service (Every 15,000-20,000 Miles or 4-6 Months)

The PM A is your bread-and-butter service. It’s the most frequent and focuses on the items that change most often. This is also the service where you catch small problems before they become big ones.

Engine Oil and Filter Change

Drain and replace engine oil with OEM-specified grade (typically 15W-40 or 10W-30 for newer engines)
Replace oil filter(s)
Florida note: Oil analysis is highly recommended. Send a sample to a lab every other oil change. In Florida heat, oil degradation happens faster, and oil analysis catches internal engine problems (coolant intrusion, fuel dilution, bearing wear) before they become catastrophic.
Check oil level with dipstick after fill — auto-fill systems can sometimes under-fill

Fuel Filter Replacement

Replace primary fuel filter (water separator)
Replace secondary fuel filter
Drain any water from the fuel filter housing
Florida note: Water contamination in diesel fuel is more common in humid climates. I see water-contaminated fuel regularly, especially from stations with older underground tanks. Change fuel filters on the shorter end of the interval.

DEF Filter (If Equipped)

Inspect DEF filter and replace per manufacturer interval
Check DEF fluid level and quality
Inspect DEF lines for crystallization
Florida note: DEF crystallizes faster in heat. Inspect the DEF dosing injector and lines for white crystalline buildup at every PM A.

Air Filter Inspection

Inspect the primary air filter element — replace if dirty or damaged
Check the air filter restriction gauge/indicator
Inspect air intake system for leaks, loose clamps, or damage
Florida note: Florida’s sandy environment (especially near construction zones and agricultural areas west of Palm Beach) can load air filters faster than expected. Check more frequently if operating in dusty conditions.

Coolant System Check

Check coolant level and top off
Inspect for visible leaks (hoses, connections, water pump weep hole, radiator)
Florida note: Check coolant concentration with a refractometer. Florida heat depletes coolant additives faster. If SCA (supplemental coolant additive) levels are low, add SCA or change coolant.
Inspect radiator and charge air cooler for debris buildup. Florida’s bug population is legendary — a clogged radiator runs hot.

Belt and Hose Inspection

Inspect serpentine belt for cracks, fraying, glazing, and proper tension
Inspect all coolant hoses for softness, swelling, cracks, or leaks
Inspect heater hoses and DEF hoses
Check all clamps for tightness
Florida note: Replace any hose that feels soft or spongy. In Florida heat, hoses fail quickly once they start degrading. A $20 hose replacement prevents a $2,000 breakdown.

Brake Inspection

Measure brake lining/pad thickness on all wheels
Check pushrod stroke (critical for DOT compliance)
Inspect brake drums/rotors for cracks, scoring, and heat checking
Check automatic slack adjusters for proper function
Inspect brake hoses and air lines for leaks, chafing, or damage
Check ABS warning light — if it’s on, diagnose and repair
Florida note: Humidity accelerates brake drum corrosion. Florida trucks develop surface rust on drums faster, which can cause noise and uneven wear. Inspect drums closely at every PM.

Tire Inspection

Check tread depth on all tires (minimum 4/32” steer, 2/32” drive/trailer)
Check inflation pressure (cold, per manufacturer spec)
Inspect for cuts, bulges, embedded objects, uneven wear
Check valve stems and caps
Florida note: In summer, check tire pressure when tires are cold (early morning before driving). Heat expansion can mask underinflation. I recommend running 5-10 PSI above minimum for Florida summer operation to account for heat buildup.

Electrical Check

Test battery voltage (should be 12.4V+ per battery at rest)
Load test batteries if over 1 year old
Check battery cable connections — clean and tighten if needed
Inspect alternator output (13.5-14.5V while running)
Check all exterior lights
Florida note: Batteries in Florida typically last 2-3 years, not 4-5. Test at every PM A and replace proactively at 2.5 years. Apply dielectric grease to all exposed connectors.

Fluid Level Check

Power steering fluid
Transmission fluid (check condition and level)
Differential fluid level (if accessible)
Windshield washer fluid
Clutch fluid (manual transmission)

Lubrication

Grease all chassis fittings per manufacturer specs
Lubricate fifth wheel plate and jaws
Lubricate door hinges, hood hinges, and latches
Florida note: Salt air and humidity wash grease out faster. Use marine-grade or high-moisture-resistant grease on chassis fittings for Florida trucks.

Visual Inspection

Walk around the entire truck and trailer
Check frame rails for cracks or damage
Inspect suspension components (springs, U-bolts, bushings, air bags)
Check exhaust system for leaks or damage
Inspect cab mounting hardware
Check mirrors, windshield, and wipers
Verify fire extinguisher is present and charged
Check safety equipment (triangles, reflective vest)

PM B — Intermediate Service (Every 50,000-60,000 Miles or 12 Months)

The PM B includes everything in PM A plus deeper inspections and additional services. This is your mid-cycle thorough checkup.

Everything from PM A, Plus:

Transmission Service

Check transmission fluid level and condition
Replace transmission filter if equipped
Some manufacturers require fluid change at this interval
Check for leaks at seals and gaskets
Inspect shift quality (automated manual transmissions — check clutch teach-in values)

Coolant System Service

Full coolant analysis (send sample to lab)
Test coolant freeze point, pH, and SCA levels
Add SCA as needed or replace coolant if degraded
Pressure test the cooling system for hidden leaks
Florida note: I recommend full coolant replacement every 2 years / 300,000 miles in Florida, regardless of manufacturer interval. The heat degrades coolant additives much faster than the manufacturer’s lab testing assumes.

Air System Service

Replace air dryer cartridge
Drain all air tanks (supply, primary, secondary, wet tank)
Check air compressor output (should build from 85 to 100 PSI in under 2 minutes)
Test governor cut-in and cut-out pressures
Check all air fittings and connections for leaks
Test low air pressure warning (must activate at 60 PSI or above)
Test parking brake air pressure release
Florida note: Humidity means more moisture in the air system. Replace the air dryer cartridge at every PM B (not annually — by mileage) in Florida. A waterlogged air system corrodes valves and can freeze even in warm weather due to rapid pressure drops.

Steering System Inspection

Check steering wheel free play
Inspect tie rod ends, drag link, and pitman arm for wear
Check power steering fluid level and condition
Inspect power steering hoses for leaks or deterioration
Check king pins for wear (on trucks with king pin suspension)

Exhaust and Emissions System

Inspect DPF for soot loading — force a regen if needed
Check DEF dosing injector for crystallization
Inspect all exhaust clamps, gaskets, and hangers
Check for exhaust leaks under the cab
Inspect turbocharger for play, leaks, and oil seepage
Florida note: If your truck does a lot of local/low-speed driving in South Florida, the DPF may not regenerate effectively on its own. Forced regens at PM B intervals prevent soot-related derates.

Wheel End Inspection

Check wheel bearing adjustment or hub unit condition
Inspect hub seals for leaks
Check lug nut torque on all wheels
Inspect wheel condition — cracks, elongated bolt holes
Florida note: Salt air causes faster hub seal corrosion. Check for rust streaks around hub caps and seals.

Electrical Deep Check

Test all dashboard gauges and warning lights
Check wiring harness routing — look for chafing, heat damage, or rodent damage
Test ABS system — read and clear codes
Check backup alarm functionality
Inspect all ground connections for corrosion

Fifth Wheel Service

Inspect fifth wheel for cracks and wear
Check locking jaw operation and condition
Verify fifth wheel mounting bolts are tight and not cracked
Grease fifth wheel plate thoroughly
Check fifth wheel height adjustment

PM C — Major Service (Every 100,000-120,000 Miles or 24 Months)

The PM C is the big one. It includes everything from PM A and PM B, plus major component inspections and replacements. This is where you invest serious time and money to keep the truck reliable for the next 100,000 miles.

Everything from PM A and PM B, Plus:

Valve Adjustment

Adjust engine valves per manufacturer specification
Inspect valve train components
This is critical on some engines (Detroit DD13/DD15, Cummins X15) for maintaining proper engine performance and preventing valve-related failures
Cost: $300-$600

Coolant System Overhaul

Full coolant flush and replacement
Replace thermostat(s)
Inspect water pump — replace if weep hole is dripping or shaft has play
Replace coolant hoses that are over 5 years old or show signs of deterioration
Inspect and clean the radiator — consider a professional radiator cleaning service
Florida note: This is non-negotiable in Florida. At 100,000 miles in South Florida heat, your coolant has lost significant protective properties, your thermostat is likely sluggish, and your hoses are aging fast.

Brake System Overhaul

Replace brake linings/pads if below 50% remaining
Inspect and measure brake drums/rotors — replace if at or near minimum thickness
Replace brake hardware kits (springs, rollers, pins)
Inspect and replace brake chambers if diaphragms are aged
Rebuild or replace automatic slack adjusters that are not maintaining proper adjustment
Full air brake system leak test
Florida note: Brake hardware (springs, pins, rollers) corrode faster in Florida’s humidity and salt air. Replace all hardware at PM C even if it “looks OK.” Corroded hardware causes premature brake failure.

Suspension Overhaul

Inspect all leaf springs for cracks and sagging
Inspect air springs for cracks, leaks, and aging
Check all U-bolts and center bolts — re-torque or replace
Inspect bushings in spring pins, equalizer beams, and torque arms
Check shock absorbers (if equipped)
Florida note: Rubber bushings deteriorate faster in UV and heat. If bushings are cracked or visibly deteriorated, replace at PM C.

Electrical System Overhaul

Replace batteries if over 2 years old (in Florida)
Test and clean all major electrical connectors
Apply dielectric grease to all connectors
Inspect and test alternator output under load
Check starter draw — replace if drawing excessive amps
Replace windshield wiper blades
Test all light bulbs and replace dim or intermittent ones

Chassis Lubrication Overhaul

Grease all chassis points
Replace king pin bushings if worn beyond spec
Grease or replace spring pins and bushings
Service fifth wheel thoroughly

Differential Service

Check differential fluid level and condition
Replace differential fluid per manufacturer interval
Inspect for leaks at seals and cover
Florida note: Some manufacturers recommend differential fluid change at 250,000 miles, but in Florida’s heat, I recommend checking condition at PM C and changing if degraded.

Additional PM C Items

Inspect frame rails thoroughly for cracks, corrosion, and damage
Check cab mounts and insulators
Inspect fuel tanks for corrosion, leaks, and mounting security
Service A/C system (check refrigerant, clean condenser, check belt)
Inspect clutch (manual) or clutch actuator (automated) for wear
DPF cleaning — remove and have professionally cleaned
Florida note: Professional DPF cleaning at PM C intervals prevents soot-related derates and extends DPF life significantly. Cost is $400-$800 but saves thousands in downtime.

PM Interval Summary Table

Service	Standard Interval	Florida Interval	Key Focus
PM A	25,000 miles / 6 months	15,000-20,000 miles / 4-5 months	Oil, filters, brakes, tires, batteries
PM B	75,000 miles / 12 months	50,000-60,000 miles / 10-12 months	PM A + transmission, coolant analysis, air system, steering
PM C	150,000 miles / 24 months	100,000-120,000 miles / 18-24 months	PM A+B + valve adjust, coolant overhaul, brake overhaul, DPF cleaning

What a PM Costs vs. What It Saves

Here’s the honest math:

PM A Cost (Mobile)

Oil and filters: $200-$400
Labor (1.5-2 hours): $225-$300
Misc parts (belts, bulbs, fittings if needed): $0-$200
Total: $425-$900

PM B Cost (Mobile, in addition to PM A)

Additional filters and fluids: $200-$400
Additional labor (1-2 hours): $150-$300
Total: $775-$1,600 (including PM A items)

PM C Cost (Mobile + some shop items)

Major parts (thermostat, hoses, brake hardware, batteries): $500-$1,500
Additional labor (3-5 hours): $450-$750
DPF cleaning (if included): $400-$800
Total: $2,125-$4,650 (including PM A+B items)

Annual PM Cost for a Truck in Florida

Assuming 100,000 miles/year: 5 PM A services + 1 PM B = roughly $4,000-$7,000/year

What Skipping PMs Costs

Average unplanned breakdown repair: $1,500-$5,000
Average downtime per breakdown: 1-3 days × $500-$1,000/day = $500-$3,000
Average roadside tow: $1,500-$3,000
Average cost per breakdown event: $3,500-$11,000

The average truck that skips PMs has 3-5 unplanned breakdowns per year. That’s $10,500-$55,000 in breakdown costs versus $4,000-$7,000 in PM costs.

Preventive maintenance doesn’t cost money. It saves money. Massively.

Mobile PM Service: How It Works

I offer preventive maintenance service at your location. Here’s how it works:

We schedule around your operation. PMs can be done at night, on weekends, or whenever the truck is parked. No lost revenue.
I come to your yard or lot. Whether you have one truck or twenty, I set up at your location and work through the fleet systematically.
Full documentation. You get a detailed PM report for each truck — what was done, what was found, what needs attention at the next service.
Proactive parts sourcing. If I find something during a PM that needs a part I don’t have, I order it and schedule the repair before it becomes a breakdown.
Consistent records. I maintain PM history for my fleet customers. We know exactly what was done and when, which is critical for DOT compliance and warranty claims.

Get Your Trucks on a PM Schedule

Whether you’re an owner-operator with one Cascadia or a fleet manager with 50 trucks in Palm Beach County, a proper PM schedule is the difference between running a profitable operation and constantly fighting fires.

Call Albert’s Road Service at 561-475-8052. Let’s set up a PM schedule that keeps your trucks rolling and your costs predictable.

Albert is the owner of Albert’s Road Service LLC — a 24/7 mobile truck and trailer repair service based in West Palm Beach, Florida. For preventive maintenance, emergency repair, or fleet service throughout Palm Beach County, Broward County, and the Treasure Coast, call 561-475-8052.

The Complete Preventive Maintenance Schedule for Commercial Trucks in Florida