[Mgs] OIL

[riverside]

how much ZDDP in STP??


art d
----- Original Message ----- 
From: "Max Heim" <max_heim at sbcglobal.net>
To: "MG List" <mgs at autox.team.net>
Sent: Saturday, August 28, 2010 4:30 PM
Subject: Re: [Mgs] OIL


> 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.
>
>
> --
>
> 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 12:35 AM, Barney Gaylord at barneymg at mgaguru.com wrote:
>
>> Chuckle.  Something wrong with "the average LBC"?  My MGA fairly
>> often does 500 miles in a single day.  385,000 miles and
>> counting.  So far I do not worry about ZDDP, except during a new cam
>> break in period.  I run NAPA 20W50 in summer and 10W40 in
>> winter.  Current engine has 75,000 miles, going strong, never had the
>> bottom end apart.
>>
>> Barney Gaylord
>> 1958 MGA with an attitude
>> http://MGAguru.com
>>
>>
>> At 11:23 PM 8/27/2010 -0500, "Ron  S" (<iverside> wrote:
>>> The street version does not contain zddp. VR-1 does contain zddp
>>> and  is labeled for off-road use only but does not contain the high
>>> milage additives of the street version.  It is meant to be changed
>>> after every race, or about every five hundred or so miles. This is
>>> about the milage the average LBC `weekend tourer' does in a driving
>>> season in a moderate climate area.
>>> ....
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