Ram TRX Maintenance Schedule & Parts Checklist: Oil, Filters, Plugs, Fluids & Battery

The Ram TRX is a 702-horsepower, supercharged desert truck, and the fastest way to turn one into an expensive paperweight is to maintain it like a grocery-getter. The 6.2L Hellcat-derived V8 makes boost, lives hot, and — the way most people actually drive a TRX — spends its life on the “severe-duty” side of the ledger. Good news: none of the maintenance is exotic. It’s oil, filters, plugs, fluids and a battery, on a disciplined schedule, with the right parts. This checklist lays out what each service needs and roughly when, so you can keep a shelf stocked and never get caught mid-trip. Numbers here are gearhead rules-of-thumb for a hard-used truck — always confirm the exact interval, spec and capacity in your own owner’s manual and maintenance guide, because that book is the authority for your VIN and model year. For what physically fits, keep the year-by-year fitment guide open alongside this one.

Normal duty vs. severe duty — pick the right column

Every Ram maintenance guide has two schedules: the easy-street one and the severe-duty one (Ram’s “Schedule B”). Severe duty is for trucks that tow, haul, see extreme heat or cold, run in dust or off-road, or do lots of short hops. A TRX that gets used the way it was designed — desert, trails, towing, spirited pavement — is a severe-duty truck. When in doubt, run the shorter intervals. It’s cheaper than a rebuild.

Engine oil & filter — the one you never stretch

The 6.2 supercharged V8 takes a large-capacity fill of full-synthetic 0W-40 meeting Chrysler’s MS-12633 spec — not a generic 5W-30. Two hard rules:

• Interval: let the oil-life monitor guide you, but a hard-driven TRX is well-served treating 5,000 miles or 12 months (whichever comes first) as the ceiling. Boost, heat and desert dust all age oil faster than the monitor’s easy-life assumptions.
• Filter every time: use the correct large TRX/Hellcat-family oil filter, and change it at every oil service — never skip it to save a few dollars on a supercharged engine.

Keep two or three oil filters and a case of the correct 0W-40 on the shelf so an oil change is never a reason to postpone a trip. Browse consumables and service parts in the maintenance category; for genuine Mopar filters and bulk deals, the eBay rail below runs a TRX-6.2-specific filter search.

Air filter & cabin filter — cheap, frequent, high-value

A supercharged engine is very sensitive to airflow, and a TRX inhales dust.

• Engine air filter: inspect often; replace roughly every 15,000–30,000 miles on pavement, but far sooner after dusty desert or trail miles. A clogged or bypassing filter feeds grit straight into a boosted engine — this is not the place to save money. If you run an aftermarket intake, follow that filter’s clean/replace guidance; our cold-air intake buyer’s guide covers filter media and why desert dust changes the math.
• Cabin air filter: every 12,000–15,000 miles or once a year, sooner in heavy dust. Two-minute glovebox job; do it yourself.

Spark plugs — a boosted engine eats them faster

The 6.2 uses sixteen platinum/iridium plugs — two per cylinder, same as the 5.7L HEMI and the rest of the modern HEMI family, not eight — and under boost they work harder than plugs in a naturally-aspirated truck. Don’t blindly trust the 100k “lifetime” number on a generic chart:

• Plan to inspect/replace around 30,000–60,000 miles on a hard-driven truck, sooner if you’ve noticed misfire, hesitation or rough idle.
• Match the exact plug and gap your engine specifies. On a boosted motor, the wrong heat range or an over-wide gap causes real trouble.
• Tuned trucks frequently step to a colder heat range and a tighter gap — if you’ve added a tune or more boost, talk to your tuner about plugs before you chase a misfire.

The eBay rail below runs a 6.2-supercharged spark-plug search so you can source the correct part or a full set.

Brake fluid, coolant & driveline fluids — the forgotten ones

These don’t have a mileage light nagging you, which is exactly why they get skipped.

• Brake fluid: it absorbs moisture over time, which lowers its boiling point — a genuine concern on a heavy truck you actually use hard. Flush on time, roughly every 2–3 years, regardless of pad wear. This pairs with the friction side of the system covered in our brake upgrades guide and brake pad types explained.
• Engine coolant: long-life, but not lifetime. Check the manual for the first-change point (often well past 100k) and then the repeat interval, and use only the correct OAT coolant.
• Automatic transmission fluid: the ZF 8-speed needs a specific ATF spec — do not pour in a generic bottle. Service per the severe-duty schedule if you tow or run hard.
• Differentials & transfer case: front and rear diff gear oil and transfer-case fluid have their own specs and intervals; a truck that sees dirt, water crossings or towing should follow the severe-duty side. If you’ve re-geared for larger tires (see the wheel & tire fitment guide), factor fresh gear oil into that job.
• Supercharger oil: the 2.4L blower has its own oil, separate from the engine. Low-frequency (often checked around 100k or per the manual), but real — and doubly worth watching if you spin the blower harder than stock.

Battery — heat and boost are hard on it

The TRX runs a large-capacity battery, and desert heat plus high electrical demand shorten battery life. Expect a service life in the 3–5 year range and test it before it strands you:

• Have it load-tested annually once it’s a few years old, especially before summer heat or a big trip.
• Keep the terminals clean and tight — a lot of “won’t crank / weird electrical gremlins” complaints trace back to a corroded or loose terminal.
• Replace with the correct group size and cranking rating; don’t downsize to whatever’s on sale.

The shelf checklist — what to keep on hand

For a truck you actually drive, keep these consumables stocked so service is never a reason to park it:

1. Two–three correct oil filters + a case of 0W-40 (MS-12633).
2. A spare engine air filter (and a cabin filter) — cheap insurance after a dusty trip.
3. A set of the correct spark plugs at the right heat range/gap for your setup.
4. The correct brake fluid, coolant, ATF and gear oil specs written down (or bottled) so you’re never guessing at the counter.
5. Battery terminal cleaner/protectant and a note of your install date.

Where to buy

New service parts — filters, plugs, fluids, battery accessories — live in the maintenance category on Amazon; just confirm the 6.2 TRX / DT 1500 application before checkout. For genuine Mopar filters, OEM-spec fluids, factory spark plugs, or bulk multi-packs, eBay Motors is often the better marketplace — the rails below run TRX-6.2-specific searches for oil filters, engine air filters, supercharged spark plugs and cabin filters.

Keep building the reference layer: the year-by-year fitment guide for what fits, the common TRX problems & the parts that fix them guide for the truck’s known weak spots, the brake upgrades guide and brake pad types explained for the stop side, the cold-air intake guide for filtration and airflow, and the wheel & tire fitment guide for the corners.