That's just not correct, it's like saying if 0W/40 fully synthetic is right
for high-performance modern engines it must be good enough for ours, which is
definitely *not* correct. There is more than enough evidence out there from
*owners* that modern, low ZDDP oils cause problems, see
http://www.ttalk.info/Zddp.htm and http://lnengineering.com/oil.html#Z13. The
fact that you can quote sources that say SM is fine, and I can quote others
which say it isn't, just goes to show how confusing the whole subject is. It
is a fact that modern Diesel oils have a higher level of protection, and so
conform to the earlier petrol grades, precisely because Diesel engines need
more protection for the little ends than SM can give, similar to flat-tappet
engines.
PaulH.
----- Original Message -----
API motor oil guide says "For automotive gasoline engines, the latest engine
oil service
category includes the performance properties of each earlier category. If an
automotive
owner's manual calls for an API SJ or SL oil, an API SM oil will provide
full protection."
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