Quote:
Originally Posted by GoodtoGo
I went back and looked through some of the specs again. There are two aspects to ash. The first is the starting ash content of the oil that you were referring to and the second is the propensity of the oil to create and deposit ash/carbon/soot when heated. I was more referring to the latter, especially considering issues with carbon deposits on intake valves.
In any case, regarding starting ash content:
BMW LL01 ACEA A3/B4 max ash content is 1.6% (not 1%)
Rotella T6 API CJ-4 and ACEA E9 both have a max ash content of 1%
This is what Shell says of T6 related to the proposity of the oil to create and deposit ash/carbon/soot:
"Shell Rotella T6 helps control the impact of soot on your
engine through increased levels of high-performance ashless
chemistry that keeps soot particles apart. You get up to 36%
improvement in soot control at typical motor-oil-soot
levels.* This helps keep the oil free flowing for good startup and
continued energy efficiency, and helps prevent sludge, deposits
and wear."
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True yet the min ash for A3/B4 is 1%. It's a HDEO and advertised for that market.
Shell has some GTL oils which are interesting. I just wish they were C3 with Low
NOAK.