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Originally Posted by Mustanger2
Absolutey WRONG! More damage to our new type engines using 30W...!!!! Hope you like valve clatter when you start up for the first 5 minutes!
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I wonder about this one. What's the problem with using 5w30? At cold start-up they are both 5w spec for fast lubing, so what's the difference? I know the book calls for 5w20, but since the mod motors run so flippin hot, having 30w protection once it's hot seems to make a lot of sense to me. Motorcraft makes their specified semi synthetic in both multi-weights. Any input would be appreciated. Motor oil is still a dark science with so many authorities claiming cosmic wisdom.