Mobil 1 0W-40 user must read! - PeachParts Mercedes-Benz Forum

uberwgn · #1 04-04-2007, 05:10 PM

Quote:

Originally Posted by loubapache

Your Mobil 1 viscosity, after 10k miles, is shearing down to a xW-30 viscosity oil. It started with a viscosity at 100 deg C around 14 cSt. Yours are around 11 - 12. Most xW-30 oil have this around 10.0 - 12.5 range.

The Elf, however, held much better in that department.

I am not a big fan of oil analysis, not because it does not make sense but it can report only to one significant figures in many areas. What is the difference between Fe 8 and 9? Not much.

I understand about the UOA scene -- I just wanted some validation that the 10 - 12K mile intervals were acceptable for this car and they are. The UOA can also show evidence of serious problems.

Don't put too much faith in the first set of data pertaining to the viscosity. The car had been sitting at the selling dealer for nearly a year and was shuffled about the parking lot many times and left idling for extended periods. There was definitely fuel present in the first UOA, none in the subsequent tests. "Lot" cars lead a hard life. The 2nd and 3rd analyses depict a good running car

Yes, the ELF appears to be a fine product - - it's a high HT/HS oil and meets 229.xx, of course. Either oil appears to yield nice wear numbers.

loubapache · #2 04-04-2007, 05:15 PM

Quote:

Originally Posted by uberwgn

I understand about the UOA scene -- I just wanted some validation that the 10 - 12K mile intervals were acceptable for this car and they are. The UOA can also show evidence of serious problems.

Don't put too much faith in the first set of data pertaining to the viscosity. The car had been sitting at the selling dealer for nearly a year and was shuffled about the parking lot many times and left idling for extended periods. There was definitely fuel present in the first UOA, none in the subsequent tests. "Lot" cars lead a hard life. The 2nd and 3rd analyses depict a good running car

Yes, the ELF appears to be a fine product - - it's a high HT/HS oil and meets 229.xx, of course. Either oil appears to yield nice wear numbers.

Yes, I saw the fuel dilution. That is why I always change my oil in the spring after our severe winter here in Micgihan. I have a 3-mile commute and that does not help either. Short trip in cold weather is very bad to the oil and I do not think the FSS gived enough of a penalty to this.