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I've used 20w50 Castrol for the last 9 months. Prior to that, who knows. I think the car sat around for a few months prior to me buying it, but gee whiz When we changed the front crank seal, oil was gummed up all around that bad boy (it WAS one of the BIG sources of oil leakage ) I wish Id took a picture...
Sorry
I'll try to get them back up.
Terry suggested 10w40... I guess Ill go to that. (20w50 is what my dad has always used in his vehicles, and he used to be a mechanic, so that is what I,ve used...)
how about you forget 20w50, 10w40 and go to what ford recommends. 10w30 in 100*+ environments, or 5w30 in environments like new england. Catrol GTX my friend.