<VV> WAS: engine noise; NOW: synthetic motor oil

[Dale Dewald]

At 14:33 10/07/2008 -0400, Bryan Blackwell wrote:

>Definitely - a lot of folks have been happy with Amsoil in Corvairs.
>Do be sure to get the grade that is *not* "Energy Conserving".
>Perhaps an Amsoil user can give you a more precise answer, but if you
>select a grade that they sell for flat tappet engines that would be
>best.

According to Amsoil, their type AMO 10W-40 Premium Protection, type ARO 
20W-50 Premium Protection, and type HDD 5W-30 Series 3000 Diesel oils are 
recommended for older flat tappet engines.  All of these oils contain 
approximately 1265 ppm of Phosphorous and 1375 ppm Zinc, according to 
Technical Service Bulletin MO-2007-08-08.

I have been using Amsoil type ACD 10W-30/SAE30 Diesel oil in all of my 
Corvairs for about 5 years.  This product also has 1265 ppm P and 1375 ppm 
Zn. This is essentially a straight 30 weight oil with no viscosity index 
(VI) improvers; but the 100% synthetic formula has a low pour point so that 
it meets the 10W-30 specification.  We live in the Upper Peninsula of MI 
and only drive our Corvairs from about April through October (avoiding salt 
season). Unless we leave the area [to a CORSA fuction] they only see 
ambient temperatures ranging from 30 to 85F.

None of the above oils are rated "energy conserving."

>On Oct 7, 2008, at 11:24 AM, Hugh Fowler wrote:
>
> > Is it ok to replace the petro oil with Amsoil?  I have this in my
> > other vehicles and have had great service.

I would recommend choosing from Amsoil types AMO, HDD or ACD.

Dale Dewald
Hancock, MI