The official factory line is M1 every 15K or once a year.
The hard test data on M1 suggests that at about 12.5, it is good to get it out of there.
Personally, I would do 7500 miles myself. This is due to the cost of a replacement engine and all.
Now, if you bump up to Red Line, personally, I could justify the 15K interval.
Liquid moly is what?????????????
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Rich Belloff
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