How about a partial synthetic like Brad Penn Grade 1 20w-50. It has high
zinc content, and it supposedly provides outstanding protection for flat
tappet cams. It is the same refinery as the old Kendall GTX green oil. At
about $4.50 per quart it is about the same price as most full synthetics. I
have used it now for about 6 months with no increased leakage.
www.bradpennracing.com
John Cohen
76 TR6
http://www.triumphowners.com/701
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.
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