2021 Mercedes AMG C63S - 10k miles - M1 FS 0w40

[OVERKILL]

With a flashpoint of 430 (I've seen a VOA of M1 0W40 that shows virgin FP of 435), we have no way of knowing for sure how much viscosity loss is due to fuel vs. mechanical shear. This is one case where it would make a lot of sense to do the next UOA with a lab that uses gas chromatography.

Yep, that's why I suggested Polaris/OAI.

 

[himemsys]

Just based on the high flashpoint and twin turbos, I'd guess the viscosity loss is more due to shear than fuel. Although, the lower flashpoint and viscosity of the factory fill makes it less clear. Anyone know the starting viscosity of the factory fill?

 

[TiGeo]

My VOA of M1 0W40 showed 100C viscosity of 13.0 cst. This is 10.97 cst so a ~16% drop which is about what I usually see on any xW40 oil I've used.

 

[dparm]

Just based on the high flashpoint and twin turbos, I'd guess the viscosity loss is more due to shear than fuel. Although, the lower flashpoint and viscosity of the factory fill makes it less clear. Anyone know the starting viscosity of the factory fill?

Hard to find this data, but the previous 5w40 MB-branded oil was made by XOM and had KV@40 of 82.84 and KV@100 of 13.59. PQI tests in 2018 showed it to be pretty darn close to the claimed spec:

PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM

The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality of lubricants in the marketplace. Our mission is to serve the consumer of lubricants by randomly sampling and independently testing lubricants taken from the field. Test...

pqiadata.org

 

[Nesterenko]

Confusing title. I was expecting a 10,000 mile oil run.

5k intervals look good to me. PLENTY of buffer room.

Yes, title should be different. 10k miles would be a good interval but I guess in a new vehicle it may prudent to OCI early.

 

[tyman]

jay suisse dat calcium doe

 

[Rhill]

Just popped in to say that's a bloody awesome car!
A friend had the baby C43 with a mild reprogram.....and it was a fire breather.

I can't imagine the C63S