[TR] Starting a dry engine advice sought

[Don Hiscock]

Valvoline Racing Oil has always had high ZDDP levels, as far as I know.
Certainly it has for the almost ten years I've used it.
https://www.valvoline.com/about-us/faq/racing-oil-faq



On Sun, Sep 9, 2018 at 7:14 AM, Paul Dorsey <dorpaul1 at gmail.com> wrote:

>  Five or 10 years ago I didn’t think there was much of an  zinc ingredient
> in  Valvoline racing oil. Have things Change D?
>
> On Sun, Sep 9, 2018 at 8:09 AM TERRY SMITH <terryrs at comcast.net> wrote:
>
>> I have, on occasion, had too much of a good time, so yes I'm guessing yes
>> anything has a surfeit of advantage.  If you're running a zinc additive I
>> don't think you'd need to also use racing oil.  I'm just too lazy to mess
>> with it.  And too, I have to top off the oil with fair frequency and don't
>> want to have to track the dilution factor by adding zinc everytime.
>>
>> On September 9, 2018 at 7:56 AM Paul Dorsey <dorpaul1 at gmail.com> wrote:
>>
>>  Why do you think the synthetic  oil  might have done that? I ordered
>> some ZDVP from Moss, So I guess Valvoline racing one might be overkill for
>> me. Can you have too much zinc?
>>
>> On Sun, Sep 9, 2018 at 7:46 AM TERRY SMITH < terryrs at comcast.net> wrote:
>>
>> Just my experience, but on my last engine rebuild, my lifters were toast,
>> having traded much metal with the cam lobes.  I'd run exclusively Valvoline
>> synthetic, an otherwise fine oil except for the zinc content.  Now I'm
>> running Valvoline 20-50 racing oil.  So far no problems, but we'll know for
>> sure at the next tear down.
>>
>> Terry Smith, '59 TR3A
>> New Hampshire
>>
>> > On September 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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>>
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