ZDDP has no impact on valve seat recession. It is effective
in slip and slide (cam and lifter) movies only.
art d
----- Original Message -----
From: "Barrie Robinson" <barrie@look.ca>
To: "Paul Osborne" <paul@ece.rochester.edu>; "Barney Gaylord"
<barneymg@mgaguru.com>
Cc: <mgs@autox.team.net>
Sent: Sunday, August 29, 2010 12:03 PM
Subject: Re: [Mgs] OIL
>I was paid by Shell to test out their oil on my brand newly restored Austin
>Healey. It was meticulously measured for the dreaded valve seat recession
>and I put a lot of miles on. After this Shell measured again (they made a
>special tool to fit the engine) - and voila! - no signs of wear! This
>during a period when some companies were pushing additives
>
>
> At 10:54 AM 8/28/2010, Paul Osborne wrote:
>>I'm with Barney, why all of these exotic oils and lube mixes??? Have been
>>using NAPA 20-50 too and with 100,000 + and in 2 cars , regular
>>changes all is just fine. Guess there is a need to spend $$ .
>>paul
>>
>>
>>>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.
>>>>....
>>___
>>
>>--
>>Paul Osborne
>>University of Rochester
>>Engineering & Technical Services
>>Department of Electrical and Computer Engineering
>>201 Hopeman Bldg River Campus
>>Rochester, New York 14627
>>585-275-5226
>>paul@ece.rochester.edu
>>_______________________________________________
>>
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>
> Regards
>
> Barrie
> barrie@look.ca
> 705--721-9060 _______________________________________________
>
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