[Amc-list] oil protection

[Brien Tourville <hh7x@xxxxxxxxxxx>]

there's been an oil thread over on the strokers list.  if you're
trying to protect your older engine from cam wear and failure, what it
comes down to is zinc and phosphorus levels; they've been reduced as
they slowly poison catalysts, and modern roller tappet valvetrains
don't need it anyway.  [maybe cause and effect?]  the article kyung
linked to is especially enlightening; the old zinc phosphate levels
were apparently set from research published in a 1977 sae paper it
mentions.

in short, what most of us want to look for is an API rating of SG, SH,
SI, or if necessary CI.  or add a can of GM EOS with every change.



=== . ===



All other ratings for the ZDDP package are
defunct - no longer applicable other than CI-4.

The new API CI-4 rating for the ZDDP package
is only in Mobil 1 Truck & SUV / DELVAC
or Shell Rotella T.

BMW OIL - is relabled Mobil 1 DELVAC - and used in
BMW cars - trucks - motorcycles.

The only reason it will 'slowly poison' catacytics is if
your engine is BURNING OIL.






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