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    Design changes or mileage considerations?

    It seems there is a trend to go to the lighter weight oils. 0W-20 and 5W-20 etc. Some manufactures began recomending their use in engines that formerly called for 5W-30 and maybe even 10W-30 weight oils. I can only suspect the lighter oils have been wear tested with the lesser weight oils and...
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    Reply from Mobile

    I sent them and e-mail directly asking if their new Katrina formulation will be kept in service from this point on and this was the response. From Mobile Product Information: The new Mobil1 motor oil formulation currently is in the process of being tested for all API requirements and...
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    Super Tec 5W-30 ???

    The local Wally World only carries Super Tec in 10W-30 weight. Can anyone tell me if it comes in a 5W-30 weight. If so, I gotta go to another store.
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    5W-30 benifits over 10W-30?

    In a warm climate that doesn't get below 25-30 degrees in winter and often runs 85-95 in summer, is there any real downside to using a 10W-30 synthetic oil like M1 over the 5W-30? It would seem that the 10W-30 offers better protection in the heat and gives good protection for cold starts as...
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