Yeah, but why can't they define "high zinc"? Why make the customer guess,
unless it's just marketing blather?
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 8/28/10 7:25 PM, Simon Matthews at simon.d.matthews@gmail.com wrote:
> 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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