Creating a list for a major maintenance on my vehicle before winter storage. The vehicle is a 2009 C300 4matic sport and has 130k on the motor. If I miss anything or recommend other things please do chime in.

1. oil/filter change (I'll do this myself with MOTUL 8100 X-CESS)
2. tranny oil change (last done at 70k)
3. front and rear differential oil change (never have been done)
4. power steering fluid change (never have been done)
5. brake fluid change (done last 2020)
6. coolant flush (need input about this as manual says 150k or 15 years)
7. fuel filter change (need input about this again as I don't see it listed in the manual)
8. really thinking of changing the brakes as I still have the original rotor and pads and I still have 4mm front and 5mm back (LOL). It has not tripped yet.
9. preventive maintenance on the following:
- thermostat (changed at around 67k)
- want to change the water pump (still original), tensioners, idler pulley and serpentine belt (changed around 70k)
10. motor and tranny mounts (should I!?) I feel some minor vibrations when car is idle after cold starts or when the steering wheel is turned in a specific way while standing still and on Park position.

Spark plugs was changed at 90k as per the dealer so I am assuming it is still good until 180k. Front shocks,mounts and links got replaced few months ago as well and it is dead silent like new. Anything "gasket wise" that you guys think I need to replace even though nothing is leaking? Engine filter and cabin filter was changed last year so those are good. So what else did I miss?

Planning to keep this car until like forever so I do not mind spending a little fortune to keep it running like new. Besides a new C-class is no W204 not to mention the car payment attached to a new car.

 

1-5) all good. 6) I change my coolant every 2nd year anyway, so I would say yes. A lot of the others are just good maintenance so that you can start off in Spring without problems. Also, run fuel down to ¼ tank just before storing, then add fuel stabilizer and fill tank. When the car is at storage point, remove the serpentine belt and set it on the floor in front of the driver’s seat. Some suggest that the cylinders need to be lubricated. That’s really difficult, though, just for a winter.

 

Hi
If you decide to do the brakes I would recommend replacing the 4 front suspension arms in the front and front sway bar link arms.
What I found with my 2008 sport was the rubber in the bushes cracked and let the fluid out of the front caster bushes and on the sway bar links the rubbers perished on the ball joint ends all due age.

I would also look at the air and cabin filters but would probably give the fuel filter a miss.