<VV> 25,000 mile oil change

[J R Read]

Hi Randy,

Head temps typically run in the 275 to 325 degree area for me unless I'm 
PUSHING it - and then can hit 450.  When it goes above 450 I back off the 
skinny pedal.  I do not have an oil temp gauge on either Corvair - but at 
least some of the oil is passing through that hot head, so it must be 
getting pretty dang warm.  This is one of the reasons I use synthetic since 
it does not "coke" in the higher temp areas of the engine.

My '96 Blazer (water pumper) has about 150,000 and my '01 Blazer around 
120,000.  Both have lived on Mobil 1 - 10w30 since their first oil change. 
But, those engines don't need the higher ZDP levels.

If you will look back a month or so on VV, you will see that I had a concern 
about using synthetic oil which was specified as being for diesel engines. 
I don't recall that I got a specific answer at the time.  The conversation 
went off into Accel oil at Wally World or some such.  Well, I think I did 
get a couple of responses saying that it should not be a problem and at 
least one saying - don't do that.  So, what do I do with that?

Anyway, I'm not trying to be a jerk about Amziol.  Now called Amsoil? - 
which seems like an unfortunate name for such a clean product.

If I read your message correctly, you are recommending oil designated for 
diesel engines to be used in Corvairs.  So, I will ask you specifically - 
what problems could occur from using an oil recommended for diesel (no 
spark) engines in an "relatively high heat" air cooled gasoline engine?

Telling me that a trucker went 400,000 on his diesel engine does not relate 
(in my mind) to my Corvair requirements.

Later, JR


----- Original Message ----- 
From: <judynrandy at comcast.net>
To: <VirtualVairs at corvair.org>
Sent: Thursday, March 17, 2011 10:45 PM
Subject: <VV> 25,000 mile oil change


>
>
>
> Hi JR.
> You said our engines are not liquid cooled and run hotter. I say, so what. 
> 260 degrees in a water pumper is still the same as 260 degrees in an air 
> cooled engine. I can only speak from personal experience. I've used 
> nothing but Amsoils' 15w40 Heavy Duty Diesel and Marine Oil for the last 
> 30 years. You asked about shelf life. I'm not really sure about that. But 
> what I am sure of is Amsoil has a testimony of a trucker who ran 409,000 
> miles without an oil change. He used oil analysis and their by-pass 
> filter. Amsoil says to change it every 25,000 miles or one year. Which 
> ever comes first. Now, how many years does it take an 18 wheeler to rack 
> up 409,000 miles on the same oil? And, if I remember the testimony the oil 
> wasn't changed because it failed the analysis, the owner traded the truck 
> in!!!!!!! Obviously Amsoil tells people that to sell more oil. And to 
> cover their warranty issues. (Yes, Amsoil comes with a warranty!!!!)
> So, I would say if you are worried about leaving your oil in your car for 
> 2 or 3 years, you could just do a $20 oil analysis. Or just change it, if 
> it makes you feel better. But why, if it's not necessary. That thing about 
> changing oil every year is for petroleum based mineral oils. NOT 
> synthetics. If it were me, I wouldn't worry about it. I mean, 409,000 
> miles on the same oil and your concerned about shelf life?
>
> Sincerely,
>
> Randy (Cap'n) Hook
> '63 ragtop 84/pg
> '65 monza 4dr 110/pg
>
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