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    dexos 1 supersede, replace GM4718M specification?

    My brother has always put GM4718M spec'd oil in his '99 Corvette...usually Mobil 1 5W-30. If he uses oil that is stamped dexos 1 on bottle, but doesn't have on back of bottle 'GM4718M spec'd'....is he safe? Does dexos 1 alone cover the GM4718M recommendation?
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    Is 1/3 concentration of coolant ok for Florida?

    I just flushed out and installed new OEM/Kia no silicate coolant in my 2005 Kia Sedona van a couple of weeks ago...used with distilled water. I put a whole gallon of concentrated coolant in van and thought that'd get me little over 40% ratio, but I misjudged and my bulb coolant tester indicates...
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    Regular GF-5/SN motor oil vs. High Mileage oil?

    If the newer GF-5/SN motor oils are made with additives to better help with seal conditioning, etc...is it really necessary, or prudent to use instead a slightly more expensive 'high mileage' oil in an engine that isn't leaking? Am I shooting myself in the foot if I continue using conventional...
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