<VV> SL or? SM? oil in Corvair....

[Secular]

  The current API standard is SM, and calls for 0.06-0.08% Zn and P.

  Here are the running averages for all the oils tested thus far, listed by 
  their API rating:
      
    API                P (ppm)                Zn (ppm)
    ----                ---------                 -----------

    SE-SJ               1301                    1280

    CI-4                1150                     1374

    SL                     994                     1182

    CJ-4                  819                     1014

    SM                    770                        939

  I do not recommend the use of any SM or CJ-4 motor oils in any aircooled Porsche, 
  or any vehicle that can benefit from the added anti-wear additives such as 
  pre-ODBII (On board diagnostic system) vehicles...

  ----

  Source:

  What motor oil is best for my aircooled Porsche? 
  (or any high performance engine)
  by Charles Navarro
  Last Updated 07/31/08

  http://www.lnengineering.com/oil.html#Z10


  http://tinyurl.com/api-oil 


  Regards,


  Tony Irani