<VV> Quaker State "Defy" Oil

[Mark Durham]

Understand, and I agree. I have read some other non corvair forums on
the oils and have read that as long as the ppm levels stay above about
800 for the zinc, it should be fine for a broke in production engine.

I'm going to continue using a good brand of oil and ensure the ppm's of
zinc and phos are in the ranges needed for our older engines And not
take a chance. My engine only has 1300 miles on it and am still running
a 10w30 shell rotella Dino oil with additive, until at least 3000
miles, for break in, the switch to a full synthetic.
Oil is cheap, use the best available.
However, I am going to try the defy oil in a 04 PT Cruiser for a oil
change and watch how it works there. I have been using rotella oils in
that too, because of the slightly higher antiscuff agents, and this
fits in with that profile.
Mark Durham
Sent from my Windows Phone
From: Bryan Blackwell
Sent: 7/11/2012 21:35
To: Mark Durham
Cc: Virtual Vairs
Subject: Re: <VV> Quaker State "Defy" Oil
Correct, I'm not talking about this oil, I'm referring to the
introduction of the low ZDDP SM oils.  These failures occurred
following a standard break in process and the general consensus was
that the oil was to blame, not a problem with the parts or process.  I
thought this was a pretty well known issue.

The fact is that the ZDDP levels are lower for oils marked "Energy
Conserving" than in the past.  That's because there aren't any flat
tappet pushrod engines made anymore for passenger vehicles, and the
zinc is bad for the catalytic convertors.  Non-"Energy Conserving"
oils have more freedom, but still *may* contain lower levels of this
anti-wear additive.  Generally speaking pre-SM oils contained about
1200 ppm of ZDDP, and we know that level worked well, so that's what I
look for.

The only real question as I see it is how much of a concern this is
for an already broken in engine.  Certainly it's going to be less of a
problem in a two carb engine that isn't driven hard, but I have no
desire to experiment on my own engines.

--Bryan

On Jul 11, 2012, at 11:49 PM, Mark Durham wrote:

> Bryan, just to. Clear up any misunderstanding, you are not saying those
> three cams wear on this new on the market oil, are you? You are just
> saying you know three people that had cam failures, Right?
> The cam failures I have read about normally end up being a grind issue
> more than a lack of lubrication, most people are aware that they need
> to use the zinc paste prelube, etc, but galling happens anyway because
> of an inconsistent finish on the cam or lifter faces that we cannot see
> and the additional prelube is incapable of compensating for. Mark Durham