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Is there really a difference in synthetic oils? Come on!
Yeah. I think every one is different. Different base oils and additive packages. Different recommended applications. Some have 4,000 mile warranties, some have 35,000 mile warranties. Some are $2 a quart, some are $20 a quart. Compare the typical property sheets and you'll notice differences. Amsoil.com has lot's of synthetic oil comparisons with other named brand oils. Lots of differences.