Originally Posted By: tig1
For the time being I am driving my grand daughter's C300 V6, and was wondering what wt of M1 does this car call for? Nothing is on the oil cap, which is a mistake.
It's not a mistake. MB doesn't call for any one specific grade of oil. It calls for an oil meeting MB 229.5 spec, and as such it could be 0w-30, 5w-30, 0w-40, 5w-40, etc.
The spec is key. The grade is secondary.