I doubt you will find any data to support any significant differences between synthetic oils in real world applications. Use an oil that meets the API, Delvac, or other specific manufacturer standard (such as Porsche has) and meets the viscosity range recommended by the manufacturer (such as 0W-20). In many cases, this will be a synthetic only. Change the oil according to the "severe use" recommendation since most people's driving falls under the "severe use" category. If you really want to try to fine tune your change interval then have a used oil analysis done. Blackstone Labs is one such company that can advise you on the health of your oil.
Quote:
Originally Posted by Michael G.
I use full synthetic Mobil1 also and always wondered looking at many full
synthetic oils prices, is there really a difference between synthetic oils that
sell for $3.50 a quart over oil that sell for over $8.00 a quart?
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