Supertech Syn ?

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Jan 17, 2008
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Missouri
I've noticed that Supertech full synthetic is 15.XX for a 5qt jug. Also, the 10w30 on front states "Higher Mileage Formula". What does that mean? Just because it's a 10w30 or do they put seal conditioners in it? Have any of you had success with extended drains, clean engines, etc… on this stuff?
 
ST HM works - I've used it (pretty much used them all) - it works as good as any other HM (for start-up smoke). Mobil 1 High Mileage is the best of the bunch IMO.
 
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