I'll let you know. I've put my money where my mouth is and have 100k miles worth of Castrol Edge HM 0W-20 for the Odyssey.There is still some deterioration with age. 75K is probably when many seals begin to see some degree of deterioration.
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When we discuss seal compatibility, I believe we are discussing the elastomer compatibility section. Obviously SP/GF-6 sets limits to the percentage of change, but isn't this a situation where any change is undesirable?
Maybe it won't need a reseal with the timing belt, eh?