If you read in the Castrol pages, in the Myths and Facts, they'll say
that the need for break in oil or not using Synthetic
is a myth. Also, a myth that you can't go back.
On Sep 10, 2008, at 4:51 PM, Rick Lindsay wrote:
> I've heard that too Stephen. The advice used to be to never use
> synthetic in a newly rebuilt engine. The again, the first synthetic
> oils leaked pretty badly in old cars. Since then, the makers have
> reformulated synthetics so that they seal better. Rememberm paper
> gasket seals seal when swolen with fluids. The first synthetics
> didn't adequately wet the gaskets (or swell seals).
>
> Modern oils don't break down like ancient oils did. Still, its
> still MHO that the best solution is to use the oil originally
> intended and change it often to throw away the debris that it
> collects. I use 20W50 Castrol GTX and change the filter with every
> change. Something like 5000 mile intervals.
>
> rick
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