<VV> oils for classic cars/ freshened engines

[djtcz at comcast.net]

----- Original Message ----- 
From: Mark Durham < 62vair at gmail.com > 
Subject: Re: <VV> New Oils for Classic cars 

Eric, too bad on the truck but a nice try. :):) 

Thanks for your expereince with the Mobil 1 15W50 oil. I'm about ready 
to start my Corvair Engine I just overhauled, and its been a quandry 
on which oil to install for the first runs.I can certainly see the 
benefits of a slippery synthetic, it can only help preserve the cam 
and lifter faces, but, how long did it take the engines to stabilize 
oil use with break in with the synthetic? I know there are certain car 
manufacturers that send out their cars with Mobil 1 in them from the 
first mile, so I'm not biased one way or the other. I used to use a 
15W50 semi-synthetic in aircraft piston engines for breakin with no 
trouble. 

Regards 

Mark Durham 


============================================ 


I believe the engines that come with synthetic from the OEM, and modern engines in general, have finer, plateaued surface finishes and rounder, straighter bores than a machine shop is likely to create. However. I'd be surprised if chrome or moly faced rings could not still be "seated" with synthetic, if treated to many occasional short burst of heavy throttle very early in life. 


I also believe that some of the stories of rings that didn't seat are really the result of fresh rings that scuffed due to inadequate cylinder bore cleaning or even gross gas washing at birth. 


Dan T