Andy and list,
I called the Castrol tech line and inquired about having a flat tappet cam and
what oil would they recommend. The answer was to use Syntec 20W-50 only due to
the zinc content of 1200 ppm (0.12%). I asked about the Castrol GTX 20W-50
that I have used for years. The reply was that the new API spects have
significantly reduced zinc content and that the GTX was not recommended for
flat tappet engines. I believe that the Syntec 20W-50 is a full synthetic oil.
Leading to the question of switching to full synthetic oil in the following
e-mail.
Greg Perry
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