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Discussion Starter · #1 ·
Picked up motor oil for the latest oil change on my '02 'tec and noted that Motorcraft 5W20 oil now "...meets ILSAC GF-5 spec..." whereas the older oil in my basement "...meets ILSAC GF-4..." spec.

Does anyone have a quantitative idea of what the new spec actually means, other than "...it's better..." or "...it's slicker..."?
 
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