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Doesn't a "50" oil protect an engine better than a "30"??? Especially if it is going to generate higher temperatures than before it was tuned? I believe, yes. Is it any wonder why all over Europe the overwhelming majority of owners use oils such as 10W-40, 10W-50, 15W-40 and, now, 5W-50???? And most of the engines there are of even smaller displacement! That has been going on for MANY years now.
I think a 5W-50 will do a much better job than a 5W-30, all things being equal. I understand that AMSOIL may be a premium synthetic but I also understand that its best grade can cost double than a regualar synthetic (like Mobil 1, Syntec, Valvoline, etc.) which would suit fine the average owner here unless he/she were taking his/her car to the race track regularly...
Yannis
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2001 V70 T-5M SR, Classic Red/Graphite Lthr., ipd ME7 ECU Upgrade, K&N Air Filter, Cold Weather, Dolby Surr. Sound, Rear Spoiler, 17' 'Tethys' alloys
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