DRIVEDEX / Mercedes-Benz / C-Class
2001–2005
Mercedes-Benz C-Class
3.2L V6 (M112) M112 Sedan (W203)
The twin-plug V6 that runs forever if you keep the oil in it and service the 722.6.
Engine Oil
Viscosity‼
✓ verified
MB 229.3 also approved for this era — 229.5 is the better sheet
src: MB BeVo 229.5 sheet + AMSOIL lookup
Capacity (with filter)
7.5 L (4MATIC: 7.4 qt / 7.0 L)✓ verified
Total system ~8.0 L — check level after refill
src: AMSOIL lookup + Motor Reviewer M112 specs
Oil filter
✓ verified
OEM A 000 180 26 09 — same element as M272/M273 cars
src: FCP Euro HU718/5x listing + AMSOIL lookup
Drain plug torque‼
— in verification queue
Being confirmed — don't guess on this pan
Fluids
Transmission
✓ verified
src: Blauparts 722.6 kit fitment + MB Medic 722.6 DIY
ATF spec & service‼
Total fill ~7.5 L (7.9 qt)✓ verified
236.14 supersedes the original 236.10/236.12. Ignore 'lifetime fill'
src: Blauparts 722.6 guide + MB Medic
Coolant‼
✓ verified
NEVER mix with the newer pink MB 325.5 — they gel
src: MB BeVo 325.0 sheet + Blauparts coolant guide
Brake fluid‼
✓ verified
src: MB BeVo 331.0 sheet + genuine fluid listings
Filters & Ignition
Engine air filter
◐ pending
WIX 46799 pair cross-listed — replace both
src: AMSOIL lookup
Cabin filter
— in verification queue
Part number being confirmed — replace with Service B
Spark plugs
✓ verified
OEM part number being confirmed — use MB-approved plugs only, ~100k interval
src: Pelican Parts W203 plugs DIY + AMSOIL lookup
Electrical
Battery
— in verification queue
Group size/location being confirmed — AGM if originally AGM
Key fob battery
◐ pending
Match the cell inside your fob before buying
src: MB of Fresno key fob guide
Wheels & Wipers
Lug bolt torque‼
130 Nm✓ verified
Star pattern, two passes; re-check after ~50 km
src: Ricks Free Advice + Sparky X MB torque tables
Tire pressure
— in verification queue
Use the driver's door-jamb placard — varies by tire size
Wiper blades
— in verification queue
Being confirmed
Service
Oil change interval
◐ pending
Flexible Service System — follow the dash countdown
src: MB maintenance schedule (dealer guides)
Fuel
✓ verified
src: MBUSA fuel FAQ / owner's manual
Service reminder reset
— in verification queue
Procedure varies by cluster — being confirmed
🔧 Mechanic's Notes
- Oil consumption on a high-mile M112 is usually valve stem seals or the crankcase breather, not rings — fix the cheap stuff before condemning the engine.
- The oil/coolant heat exchanger seals are this engine's known weep point. Oil in the engine valley = start there.
- Skip the 'lifetime fluid' myth on the 722.6 — fluid and filter every 40–60k is what keeps the valve body shifting right.
- Budget tune-ups honestly: twin-spark means 12 plugs, so parts cost is double what the parts-counter guy quotes for a normal V6.
Field patterns from a working mechanic — diagnose your own car before buying parts.
Open Recalls
Checking NHTSA…
Other C-Class generations
Sources shown per value. Specs can vary by build date, market and trim — for anything critical (torque, fluids), confirm against YOUR owner's manual or door sticker before wrenching. Spotted an error? — corrections jump the queue.