[TR] Starting a dry engine advice sought

[Paul Dorsey]

Thanks for the info.

On Wed, Sep 5, 2018 at 1:59 PM Randall <tr3driver at ca.rr.com> wrote:

>
> > I've been told that Valvoline Racing oil has zinc in it.
> > It's odd that the newer cars don't require it.  In fact, why
> > is it important?
>
> Lots of opinions, here are mine:
>
> In a nutshell, it helps protect critical surfaces (like cam lobes and
> lifters) in case the oil film breaks down (gets rubbed away by the relative
> motion of parts).
>
> The TR camshaft (along with many other performance cars) is actually pretty
> aggressive in terms of force developed between the camshaft lobe and lifter
> during high rpm engine operation.
>
> Newer engines either use roller lifters (to eliminate the rubbing between
> lobe and lifter) or less aggressive camshafts (that are less likely to rub
> away the oil film).
>
> Honestly, I'm not absolutely convinced that the TR motor needs the extra
> ZDDP.  But it seems clear that many older engines do (even those not
> particularly high performance by today's standards); and it hardly seems
> worth taking a chance by using a lower ZDDP oil.  (AFAIK, all modern motor
> oils still contain some ZDDP, they just have lower amounts.  The oil
> industry has been searching for a suitable substitute, but I haven't heard
> of them finding one yet.)
>
> -- Randall
>
>
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