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Okay thanks steviej and Lexusfreak for your input.  My mom has a '99 Camry V6 w/ about 61k and it's going in for a minor service, so I'm going to have synthetic put in.  Ever since reading about oil gelling in the 1MZ-FE engines I figured synthetic would probably be a better choice in preventing the gelling for her car.  As far as my ES goes, the oil changes/services were done regularly by the previous owner who always brought it to Lexus, so I'm hopefully the switch won't cause any problems.

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