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A real-world study is being performed (can't find the link right now) on full synthetic motor oils over an entire year's duration (approx 10k miles) by a reputable group of amatuers (meaning not automotive engineers) by taking samples for a lab to check for wear and contamination products (and oil parameters) every 1k miles.
Results are only in for Mobil 1 and AmsOil as yet but both are encouraging to the ones who want to believe that extended intervals are OK. Both oils passed the one-year mark just fine.
I was convinced before and am fully sold now (I happen to like Syntec myself).
Add by-pass micro-filtration (they aren't) and the sky's the limit!
Insofar as combustion by-products are concerned, if the oil gets fully warmed up and the crankcase breather system is functional, loading of the oil takes a long time indeed. Swift contamination of the oil means a re-ring is necessary at a minimum.
No, I'd not waste full synthetic on an old tired engine that was close to rebuild time, either.
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Mike!
Update: found the site http://neptune.spacebears.com/cars/stories/oil-life.html
Turns out the Mobil 1 was for 18k miles and the amsoil for 14k and they want to do the mobil 1 again (pity, I'd rather see a different oil as the mobil 1 did fine).
Yea, its a chebbie 350 but that's just twice as many cylinders to blow-by!
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