The 2018 RAM 1500 belongs to the 4th generation DS (2009-2018), built with 3.6L Pentastar V6, 5.7L HEMI V8, or the 3.0L EcoDiesel V6. It takes 5W-20 full synthetic on the gas engines, 5W-40 on the EcoDiesel. Oil changes run 8,000 - 10,000 miles on gas, shorter on the diesel. This is the final model year of that generation, usually the most sorted version of the design before the redesign that followed.
A 2018 RAM 1500 is 8 years old in 2026, which at an average 12,000 miles a year puts it around 96,000 miles - the interval that decides its future. At roughly 96,000 miles a vehicle enters the window that most separates the ones that reach 200,000 miles from the ones that do not. Keeping up with whatever its own manufacturer schedule calls for here is what avoids expensive failures later. On that mileage estimate it is already past its 90,000-mile service, a repeat of the 30,000-mile service. The next milestone on its own schedule is 100,000 miles, under a year away at average use, listed as: Replace spark plugs (5.7L HEMI / 3.6L Pentastar), Inspect PCV valve, Inspect water pump.
The fault most worth knowing about on this generation is EcoDiesel emissions system faults and EGR cooler problems. Owners also report HEMI lifter and camshaft failure, the signature expensive fault, often preceded by a tick; and Exhaust manifold bolt breakage on the HEMI causing a cold-start ticking sound. None of these are certainties on any individual vehicle - they are the patterns worth checking for when you buy or when a symptom appears.
Track your 2018 RAM 1500 service history free with the ServiceSage maintenance tracker, or compare it against other model years on the RAM 1500 maintenance schedule hub.
| Interval | Service |
|---|---|
| Every 5,000 mi (severe duty / towing) | Engine oil & filter change, Rotate tires, Inspect brakes and driveline, Inspect for fluid leaks |
| Every 10,000 mi / 12 months | Engine oil & filter change (5W-20 HEMI/Pentastar; 5W-40 EcoDiesel), Rotate tires, Inspect brake pads, rotors, and suspension, Inspect steering and driveshafts |
| Every 20,000 mi | Replace cabin air filter, Inspect brake linings, Replace fuel filters (3.0L EcoDiesel) |
| Every 30,000 mi | Replace engine air filter, Inspect drive belt and hoses, Inspect coolant condition |
| Every 36 months (brake fluid) | Replace brake fluid (DOT 3) |
| Every 60,000 mi | Front and rear axle fluid change (sooner for heavy towing), Transfer case fluid change (4WD), Automatic transmission fluid service (severe duty) |
| Every 100,000 mi | Replace spark plugs (5.7L HEMI / 3.6L Pentastar), Inspect PCV valve, Inspect water pump |
| Every 120,000 mi | ZF 8-speed transmission fluid & filter (normal duty), Inspect accessory drive |
| Every 150,000 mi | Engine coolant flush (Mopar OAT / HOAT), Inspect entire cooling system |
The table above is indexed by service interval. This is the same schedule indexed by odometer reading, for when you know your mileage and want the list. If your odometer sits between these figures, work back to the last one you passed and catch up anything skipped.
| Odometer | Service due |
|---|---|
| 30,000 mi (48,000 km) | Engine oil & filter change (5W-20 HEMI/Pentastar; 5W-40 EcoDiesel), Rotate tires, Inspect brake pads, rotors, and suspension, Inspect steering and driveshafts, Replace engine air filter, Inspect drive belt and hoses, Inspect coolant condition. The every-20,000 mi service runs on its own cycle - the nearest fall at 20,000 and 40,000 miles. |
| 60,000 mi (97,000 km) | Engine oil & filter change (5W-20 HEMI/Pentastar; 5W-40 EcoDiesel), Rotate tires, Inspect brake pads, rotors, and suspension, Inspect steering and driveshafts, Replace cabin air filter, Inspect brake linings, Replace fuel filters (3.0L EcoDiesel), Replace engine air filter, Inspect drive belt and hoses, Inspect coolant condition, Front and rear axle fluid change (sooner for heavy towing), Transfer case fluid change (4WD), Automatic transmission fluid service (severe duty). |
| 90,000 mi (145,000 km) | Same as the 30,000 mi service. The every-20,000 mi service runs on its own cycle - the nearest fall at 80,000 and 100,000 miles. |
| 100,000 mi (161,000 km) | Engine oil & filter change (5W-20 HEMI/Pentastar; 5W-40 EcoDiesel), Rotate tires, Inspect brake pads, rotors, and suspension, Inspect steering and driveshafts, Replace cabin air filter, Inspect brake linings, Replace fuel filters (3.0L EcoDiesel), Replace spark plugs (5.7L HEMI / 3.6L Pentastar), Inspect PCV valve, Inspect water pump. |
| 120,000 mi (193,000 km) | Engine oil & filter change (5W-20 HEMI/Pentastar; 5W-40 EcoDiesel), Rotate tires, Inspect brake pads, rotors, and suspension, Inspect steering and driveshafts, Replace cabin air filter, Inspect brake linings, Replace fuel filters (3.0L EcoDiesel), Replace engine air filter, Inspect drive belt and hoses, Inspect coolant condition, Front and rear axle fluid change (sooner for heavy towing), Transfer case fluid change (4WD), Automatic transmission fluid service (severe duty), ZF 8-speed transmission fluid & filter (normal duty), Inspect accessory drive. |
| 150,000 mi (241,000 km) | Engine oil & filter change (5W-20 HEMI/Pentastar; 5W-40 EcoDiesel), Rotate tires, Inspect brake pads, rotors, and suspension, Inspect steering and driveshafts, Replace engine air filter, Inspect drive belt and hoses, Inspect coolant condition, Engine coolant flush (Mopar OAT / HOAT), Inspect entire cooling system. The every-20,000 mi service runs on its own cycle - the nearest fall at 140,000 and 160,000 miles. |
| 200,000 mi (322,000 km) | Same as the 100,000 mi service. |
| Part | Fitment note | Buy |
|---|---|---|
| Mopar 5W-20 Full Synthetic Motor Oil (7 qt) | For the 3.6L Pentastar V6 or 5.7L HEMI V8 | Check price on Amazon |
| Mopar 5W-40 Full Synthetic Motor Oil (1 gal) | For the 3.0L EcoDiesel V6 only | Check price on Amazon |
| Mopar Engine Oil Filter Kit 68191349AC | Fits the 3.6L Pentastar V6 and 5.7L HEMI V8 (DS and DT) | Check price on Amazon |
| Mopar 68492616AA Oil Filter | For the 3.0L EcoDiesel V6 only | Check price on Amazon |
| Mopar 53034051AD Engine Air Filter | 4th gen DS (2009-2018) only | Check price on Amazon |
| Mopar 68000487AA Cabin Air Filter | 4th gen DS (2009-2018) only | Check price on Amazon |
| Champion SP149173AB Spark Plug (set of 16) | 5.7L HEMI V8 - twin plug per cylinder, 16 total, at 100,000 mi | Check price on Amazon |
| Champion SP14ZSR15 Spark Plug (set of 12) | 3.6L Pentastar V6 - twin plug per cylinder, at 100,000 mi | Check price on Amazon |
| Mopar 68163849AB 10yr/150k OAT Coolant 50/50 (1 gal) | Use only Mopar OAT purple/violet - do not mix coolant types | Check price on Amazon |
| Mopar 8 and 9 Speed ATF | ZF 8-speed automatic, every engine | Check price on Amazon |
| Mopar BW44-44 Transfer Case Fluid (1 qt) | 4WD transfer case | Check price on Amazon |
| Valvoline Full Synthetic 75W-140 Gear Oil GL-5 (1 qt) | Rear 9.25 in axle | Check price on Amazon |
| Valvoline Full Synthetic 75W-90 Gear Oil GL-5 (1 qt) | Front 9.25 in axle (4WD) | Check price on Amazon |
| Chrysler 4318080AD Mopar DOT 3 Brake Fluid (12 oz) | Time-based change every 36 months regardless of mileage | Check price on Amazon |
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| Fastener | Torque | Size |
|---|---|---|
| Lug nut | 130 ft-lbs (176 Nm) | 22mm |
Maintenance keeps these away, but when the dash does light up these are the codes this vehicle throws most often - each with what it means and what the repair actually costs.