[Fot] Zinc Additive.

[RACER BUD]

I use Mobil 1 15-50.synthetic off the shelf oil..It was recommended to me a 
few years ago by a friend who operates a race shop...
RB
----- Original Message ----- 
From: "Enquiries Road & Track" <enquiries at roadandtrack.net.au>
To: <fot at autox.team.net>
Sent: Monday, October 31, 2011 8:01 PM
Subject: Re: [Fot] Zinc Additive.


>i have been using quite ordinary oils in my race 2500/TR6 engines for
> almost 30 years and never had an oil related failure, eg cam lobes worn 
> off
>
> in recent years i have used off-shelf Mobil 1 (not the racing version). 
> The
> current version is called 15-50. See this table to check out its zinc &
> phosphorous levels.
> http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf
>
> In my engine machine shop business we have seen this occur with flat 
> tappet
> V8 engines, especially old Ford side-valve ones and more recently Chevs,
> but usually owners have filled them with very modern oils.
>
> The "tappet" problem that people refer to is not restricted to old 
> engines.
> nearly every modern engine has a tappet (now days called a cam bucket), 
> but
> most modern OHC engines have very soft cam profiles and very large 
> diameter
> tappets. none-the-less, the oil shear problems can still occur .
>
> .Terry
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