There are also other manufacturers claiming "high" or "adequate"
amounts of ZDDP. Why are they so bashful about giving an
objective answer. If it is less than 1200 ppm the risk of
cam/lifter damage goes up.
art d
----- Original Message -----
From: "Simon Matthews" <simon.d.matthews@gmail.com>
To: "Max Heim" <max_heim@sbcglobal.net>
Cc: "MG List" <mgs@autox.team.net>
Sent: Saturday, August 28, 2010 9:25 PM
Subject: Re: [Mgs] OIL
> 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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