I've always been a Castrol 20W50 guy and tend to resist change.
This 'zinc' topic has been interesting, but somewhat over my head. Could
someone give a brief explanation of this and the pros/cons of making a switch
to Rotella?
Sloane :)
69'Six.> >>>>>>>>>>>>>>>>>>>>>> Bob,> With the introduction a couple of years
ago of ILSAC specification GF-4 and> API specification SM for gasoline-only
engine oils, the amount of> phosphorous in the oil had to be reduced to
prolong the life of catalytic> converters. Zinc-based anti-wear compounds,
which also contain phosphorous,> were reduced as well. These zinc compounds
work well to protect flat tappet> engines from excessive wear, so the modern
gasoline-only engine oils are not> as effective in this regard as they once
were.> > Diesel engine oils don't suffer from the same requirements to
protect> catalytic converters, so the amount of zinc-based anti-wear
additives> remained high. Products like Shell Rotella T Oils, which also carry
API> S-series licenses for gasoline engines, have found favor for flat tappet>
engines.> > Shell Rotella T oils contain approximately 1200 ppm zinc. At that
level,> Shell Rotella T Oils still have at least 50% more of these anti-wear>
additives as most current gasoline-only engine oils. These levels of zinc>
have historically offered good protection in flat tappet applications.> >
Thank you for your interest in Shell Rotella Products!> > Regards,> Edward
Calcote> Staff Chemist, Shell Lubricants US Technical Information Center>
http://www.rotella.com/> >>>>>>>>>>>>>>>>>>>>>>>
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