Re: IML: oil - synt vs. SAE

["Frederick Joslin" <fljoslin@xxxxxxxx>]

I had a 66 Newport (383 2bbl) from 1994 to 2004 and ran nothing but Synthitic oil in it. I changed the oil once a year whether the miles warranted it or not. I believe that I usually ran 20W/50 Mobil 1. I feel that synthetic oil is even more important for "classic" car today since they probably get driven less frequently and sit for longer periods between use. Typically the synthetic oils have a more aggressive additives package than the conventional oils.

There is a separate controversey on what constitutes synthetic oil.Castrol was sued by Mobil recently because Castrol stopped using "synthetic" oil. The judge in the case said the "synthetic" was whatever you wanted to call it. After this caseMobil backed away from 100% synthetic in thier new "tri" blend.

I strongly believe that real synthetic oil is worth the relatively small additional extra cost and use it in all my vehicles exclusively.     

> ----- Original Message ----- 
> From: dansgarage@xxxxxxxxxxxx 
> To: mailing-list@xxxxxxxxxxxxxxxx 
> Subject: Re: IML: oil - synt vs. SAE 
> Date: Sun, 11 Dec 2005 0:48:07 -0800 
>
>
> Hi All....I was wondering, and I may be opening 
> a can of worms here, no pun intended, regarding 
> synthetic oil vs. regular (SAE type) oil in our 
> Imperials. 
> I have heard various comments/rumors about how, 
> if you have used synthetic oil in a motor, you 
> CANNOT go back to regular oil and visa versa as 
> well. Then again, I heard that if you use any 
> synth oil EXCEPT MOBIL 1, this was still the 
> case but NOT with Mobil 1....is there REALLY a 
> big difference, in an older or a rebuilt, or 
> even a newer motor, if you use synth or just a 
> good SAE oil ??( as long as you change whatever 
> oil you are using every few thousand miles or 
> so) ...and then, what about these 'additives' 
> like Amsoil and such? anyone have any first had 
> experience with any of these? 
> If I am bringing up something that was 
> discussed and beaten to death here some time 
> ago I apologize for missing it and ask any 
> comments to just be directed directly to me 
> (dansgarage@xxxxxxxxxxxx) so as to not bore the 
> rest of the IML list with info they have 
> already heard before. 
> Thanks all! 
> Dan melnik 
>
>
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Fred Joslin