| Engine oil & filter | 0W-40 or 5W-40 full synthetic to MB 229.5 · 9 qt with filter (AMSOIL) | Then every 10,000 mi or yearly (Euro Premium Parts' M157 guidance) | Shorter intervals protect the cam adjusters and turbos. Check the level again after the refill, as AMSOIL advises.Liqui Moly 0W-40 oil change kit, 9 L + Hengst filter (listed 2013–18 G63) · FCP Euro ↗ |
| Air filters | 278 094 00 04 elements | Now, then about every 20,000 mi; sooner on dusty trails | Twin turbos draw a lot of air, and a clogged filter shows up as lost boost.Mann air filter 278 094 00 04 (listed 2013–18 G63) · FCP Euro ↗ |
| Cabin filter | W463 cabin filter | Now, then yearly | Mahle LAK120 cabin air filter · FCP Euro ↗ |
| Spark plugs & coils | 8 plugs (Mercedes 004 159 81 03) · coils checked or replaced together | Now if no record; about every 40,000–50,000 mi | Check coil boots and the cam-magnet plugs for oil while you're there.Genuine Mercedes spark plug kit 004 159 81 03 (×8, listed 2013–18 G63) · FCP Euro ↗Bosch ignition coil kit 276 906 05 01 (×8, listed 2013–18 G63) · FCP Euro ↗ |
| Engine coolant (high-temperature circuit) | MB 325.6-approved coolant, 50/50 · ≈14.6 qt (AMSOIL) | Now if history is unknown; then about every 4 years | Pressure-test and inspect the turbo coolant lines and the plastic expansion tank.Genuine Mercedes coolant, MB 325.6, 1 gal · FCP Euro ↗Mahle/Behr coolant expansion tank 204 500 09 49 · FCP Euro ↗ |
| Charge-air cooling (low-temperature circuit) | Separate circuit · ≈3.1 qt (AMSOIL) | Check the level now; bleed after any work | Low-speed heat soak on the trail is when this circuit works hardest. FCP Euro lists a Pierburg auxiliary water pump for 2013–16 G 63s.Pierburg auxiliary water pump 000 500 04 86 (listed 2013–16 G63) · FCP Euro ↗ |
| Automatic transmission (7G-TRONIC 722.9) | MB 236.15 ATF · 9.5 qt total fill (AMSOIL) | Now if no record; Euro Premium Parts suggests every 40,000 mi | Drain the pan and converter, fit a new filter, and set the level at temperature with a scan tool.FUCHS 722.9 transmission service kit (filter, pan gasket, 2×5 L ATF) · FCP Euro ↗FUCHS ATF 7134 FE (MB 236.15), 1 L · FCP Euro ↗ |
| Transfer case | confirm in manual: AMSOIL lists no recommendation | Now, if no record | Look for leaks at the output seals (a common G 63 job, according to au7o).Genuine Mercedes transfer case input shaft seal 015 997 08 47 · FCP Euro ↗ |
| Front & rear differentials | Hypoid gear oil, GL-5 · front ≈3 pt, rear ≈3.8 pt (AMSOIL) | Now, then with the transfer case | Loosen the fill plug before draining, check the breathers, and test each locker afterwards.Red Line 75W-90 GL-5 gear oil (1 qt) · FCP Euro ↗Genuine Mercedes differential drain plug 901 997 05 35 · FCP Euro ↗Genuine Mercedes differential cover gasket 601 351 00 80 · FCP Euro ↗ |
| Front knuckles, wheel bearings & seals | Inspect bearings and axle seals; repack | If no record | Oil on brakes this large needs fixing right away.Genuine Mercedes front wheel bearing, outer 009 981 48 05 · FCP Euro ↗Genuine Mercedes front wheel seal 463 334 01 59 · FCP Euro ↗Genuine Mercedes front axle shaft seal 009 997 28 47 · FCP Euro ↗ |
| Power steering fluid | MB 236.3 power-steering fluid | Now | Recirculating-ball box; check the damper and tie-rod ends at the same time.Febi power steering fluid (MB 236.3) · FCP Euro ↗Stabilus steering damper 463 463 00 32 · FCP Euro ↗ |
| Brake fluid | DOT 4 Plus (MB sheet 331.0, per AMSOIL) | Now, then every 2 years | The six-piston front calipers hold a lot of fluid, so flush until it runs clean.Genuine Mercedes DOT 4 Plus brake fluid, 1 L · FCP Euro ↗ |
| Battery | Group 49 AGM | Test now | Start/stop, COMAND and the locker electronics all react badly to low voltage.Bosch S6 AGM battery, group 49 · FCP Euro ↗ |