<VV> Corvair oil

[Jim Davis]

It is hard to apply recommended oil across different engines much less 
different manufactures.  It was interesting to listen at the three oil 
engineers from Ashland oil (Valvoline) on their recommendations for oils 
for Corvair engines.  This was at the Lexington convention.   Their 
consensus was, they had no recommendations.  Ashland had not tested 
their oil in an aircooled engine since 1966, while they had changed oil 
formulations about every two years.  They felt that applying their 
findings for small and medium sized, water cooled engines was not 
applicable to air cooled engines.  They also stated, the use of fuel 
injection cause the most change in engine formulations because it 
eliminated oil dilution by gasoline from a cold start.

  As for differential oil, they recommended their GL-5.  When ask about 
what it would do to the brass syncro blocker rings in Corvair manual 
transmissions, they stated the sulfur compounds were tied-up in the 
molecules and would not attack brass.

As a side note, the wife's 2009 Jetta TDI has 42 different brands of 
oils approved for use in the clean diesel (five quarts 0W-30, every 
10,000 miles).  The only one sold in the US is Castrol SLX Gold.  Try 
ordering that at your FLAPS.   Fortunately there are many Internet sources.
Jim Davis




7/18/2012 11:36 AM, Ron wrote:
> Mercedes recommends Mobil 1 for the Crossfire with a 7000 mile change
> interval so they must have a lot of confidence in it.
> RonH