I don't keep vehicles long enough to put on a million miles. In fact, up here they would probably rust out long before that. Anyway, my point is just that. Most people do not keep vehicles that long to get those high miles. Any API certified oil will adequately lubricate most engines under normal driving conditions. So whether you use Amsoil, M1 or other synthetics or even dino oil, it really doesn't matter what comparisons are made. Although I don't have any hard facts I will state that if an engine fails due to the fault of the oil, it's probably due to improper maintenance eg going well beyond recommended mileage per oil change/filter, never checking oil level, adding additives not recommended by car manufacturer, over revving, etc. I for one believe in following the manufacturer's recommended maintenance schedule. Knock on wood, I have yet to lose an engine due to the use of any brand of dino or synthetic oil used and I've been doing maintenace for near 40 years. Dino is cheaper than Amsoil or any other synthetic, so why should anyone use it if they will still get well over 100000 miles on their car using just the dino oil? Hype from oil companies is a reasonable assumption why people make their choices for the various synthetics and Amsoil hype from you counts just as much. Today, I use M1 in my Z and my '03 Sportrac. My '02 Spectra still gets the dino. My two Harley's get M1 and my '76 vette gets dino. So why do I not just use the dino to save money? Hype! Well, synthetic does give that extra edge when oil temperatures rise uncomfortably high.
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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