I also switched to Syn ATF about a year ago. No leaks. I was very careful to torque the pan bolts to spec. It was really tempting to tighten them more because it sure felt loose. I think it is VERY easy to overtighten and cut the pan gasket.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold