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Originally Posted by LarryM
Isn't synthetic the mineral-based one? Regular being petrolium based?
---Larry
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Regular is petroleum and mineral based.....it's one and the same. Synthetics are chemically manufactured. Here's a couple quotes from this month's Racecar Engineering mag:
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...oils perform three basic functions. They keep metal sufaces apart, they aid cooling and they retain debris (rather than allowing it to recirculate and cause damage). ... The largest proportion is base oil. To this are are added detergents and dispersants, a viscosity index improver, anti-oxidants and anti-wear agents, a friction modifier and other things such as pour point depressant, seal swell additive, anti-foaming agent and rust inhibitor.
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Base oils fall into two categories--mineral and synthetic...
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Mineral base oils are derived from a physical separtion process--they're distilled, while synthetic base oils are chemically derived.
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adearmas, NO street oil should ever corrode the engine. Pure race oils don't have extra additives to prevent corrosion, but that's because race engines aren't used long enough to corrode. If any oil you use causes corrosion, it's time to switch oils.
Eugene
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