Amsoil sell a 100% synthetic oil which claims a "high zinc formula"
which they recommend for flat tappet engines.
Simon
On Sat, Aug 28, 2010 at 2:30 PM, Max Heim <max_heim@sbcglobal.net> wrote:
> It's not the bottom end that suffers, it's the cam and lifters.
>
> When my B motor had approximately 70-80K miles the cam lobes were worn down
> to nubs, and the lifters were spalled all to pieces. I didn't do the initial
> breakin -- it supposedly had under 10,000 miles when I installed it (I did
> pull a main cap at the time and the bearings looked brand new). While I have
> had it it it has used 20W50 Castrol. But over that period Castrol reduced
> the amount of ZDDP several times.
>
> Since I put in the new cam I have been adding STP with every oil change,
> since I can't find a motor oil with a documented adequate level of zinc. I
> won't run racing oil because it's a year-round daily driver (over 210K so
> far), not a 500 mile/year driveway queen.
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