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Originally Posted by burly
While Royal Purple may be superior to Mobil 1 synthetic oil, the difference between Royal Purple and Mobil 1 is much less than Mobil 1 and petroleum based products. If he is just trying to avoid buying expensive petroleum based oil from the dealer for his wifes car which probably doesn't get flogged that often, then the additional cost of Royal Purple probably isn't justified. It costs considerably more than Mobil 1, from what I've seen, as 5 quarts of Mobil 1 is ~$20 versus ~$35 for Royal Purple. No doubt important for very high performance engines, but for most vehicles, Mobil 1 will provide more than enough protection when changed at regular intervales. Heck, good petroleum oils will be more than enough when changed at regular intervals.
I'd recommend either 5W-20 or if you can't find it, 5W-30 synthetic oil and change it about every 5k miles if it is being driven under "normal" conditions. Or, if you want to go the petroleum based route, use the same weights as the synthetic, just change it every 3-4k.
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The results I've seen have rather indicated that Mobil 1 is the better oil of those two oils.
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Originally Posted by nasty
My wife has a 03 Mustang coupe w/ the v-6 motor. The owners manual calls for a 5-20 w. oil. This is only available from the dealer at an exorbitant price. I asked him what would happen if I used a good 10w-30 oil instead & he said you'd probably blow all the seals out of the motor. Was he just lying to me or has any one else used the cheaper oil w/ no ill effects?
Paul
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Personally I would recommend a high quiality synthetic oil of a known brand which have passed all the test norms which the manufacturer of the car specifies. For normal driving this oil should not need changing for 600-1200 miles. Today some car manufacturers even have intervals over 1800 miles.
If the car is driven much with a low oil temp or with a high oil temperature cut the interval in half. For extra safety or if the car is driven where it's dusty replace the oil filter between the oil changes.
And a final recommendation, don't try to save money on a cheap oil filter. If you fit a filter of low quility it may reduce oil flow giving oil pressure problems as well as it may not filter out smaller particles. A filter can also "blow" which means that oil will go through the filter without being filtered and the particles trapped in the filter can get out in the engine, this without any warning signs.