<VV> hot motor oil

[Mark Durham]

Ken, take a look at the msds sheets for the oils in question. The
corvair engine was designed for oil at a viscosity of 9.3 to 12.5 cSt
at 100 degrees C , or 212 degrees F Per Richard widmans article. It is
a standard test. So, look for oils in that range, but stick to the
higher cSt end. Oils loose their ability to hold viscosity over time.
True synthetics are less prone to this so can do a better job for
longer change intervals.
People have used full synthetic up to 18 cSt at 100 degrees c, however,
which is the Mobil 1 15w50 oil. Maybe because it is more slippery? Mark
Durham

Sent from my Windows Phone
From: Ken Clark
Sent: 1/5/2012 19:20
To: Matt Nall; virtualvairs at corvair.org
Subject: Re: <VV> hot motor oil

The Mobil 1 I used was 10w40 as all my Covair oils are and one of the
questions was what kind of viscosity will we see when we compare a
Mobil 1 oil vs a dino oil when the Corvair engine is at running temp.
Has anyone ever checked to see which might be thinner when drained
from a hot engine.  By the way that engine was taken out and replace
by the correct designated engine.
Ken C



> To: virtualvairs at corvair.org
> From: patiomatt at aol.com
> Date: Wed, 4 Jan 2012 20:07:09 -0500
> Subject: Re: <VV> hot motor oil
>
>
>
>
> Since the motor oil topic came up again I have a question concerning oil when it
> gets hot(engine running temp Corvair). A few years back I made a 1000 mi. round
> trip to Helen Ga show. The engine did not use excessive oil, maybe a qt. in 400
> mi. I was told Mobil 1 was the way to go, so changed to MObil 1 before the
> trip. Used about 8 qts round trip. A Mobil(expert) tells me that the oil is
> thin as water and runs right through the engine. My thought is that any oil is
> thin at engine temp. Changed back to 10W40 Quaker ST. and did not have usage
> problem. Any thoughts on this situation?
> By the way, everyone(almost) used STP back in the 60's and did you ever take an
> engine apart that had been using it? I've taken pans off that were covered with
> 1/2 inch of sludge. I 'm told that was from STP and other additives. Not sure,
> but know what I've seen.
> Ken C
>
> ============================================================
>
>
> Ken 400 miles per qt is excessive! Your piston rings are worn..even if no smoke is visible.
>
>
> Normal is well over 1,000 miles.
>
>
> Then.. saying "Mobil 1" means nothing... it's the weight /s of the oil
>
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> had you used 10w40 M1... it would /should be the same...
>
>
> Regardless of what is "Best" for our engines...
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> When rings are worn.. thicker is better..
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>
> I remember Joe C. consuming 15 qts' from Mich. to Fla... 5w30
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> Told him to start adding 20w50.... only 5 qts. on the way back.. no more smoke...
>
>
>
> Matt Nall
> Charleston, Oregon
> http://tinyurl.com/The-Patio
> http://tinyurl.com/Matts-Tech-Pages
>
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