Re: I've read opposite...


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Posted by Todd Wilson on Tuesday, October 09, 2007 at 00:26:27 :

In Reply to: Re: I've read opposite... posted by MoparNorm on Monday, October 08, 2007 at 15:46:21 :

The API ratings dont have a thing to do with what the older engines want. Its a fact the chemical make up of gas engine oils has changed over the years. This is why some have recomended running the "diesel" oil in the old flatheads as the diesel oils had extra amounts of chemicals the old flatheads liked. The new diesel oils are having these chemicals lowered because everything is getting a cat cont. on them and the zinc compounds will eat up cats.

You change your oil you arent gonna get instant engine failure but you may not have as long a life on the engine with the new oils. Some of these old engines may not have much longer to live if they are used a lot with the newer oils.

Rebuilding an old flathead with new old stock parts may not help either. If you could rebuild a flathead with new parts that have been made recently with the newest metal treating technology then they should be able to have a long life with a new style oil.


I run synthetic oil in a few of my vehicles and the others I wouldnt think of putting it in.

Have you noticed Valvoline Max Life has suddenly become a part dino part synthetic oil?!?! I was using Max Life in one of my 318's with 230000+ miles and have noticed a low oil pressure at idle. It started after going to the new kind of Max Life. Synthetics are famous for having no or low idle oil pressure in very used engines.


Todd




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