Did you see the recent thread "Synthetic oil does indeed cause leaks, aka STARMARK rocks!" His experience was opposite of yours. Maybe you need to go to his dealer! As far as specs on the bearings, the only specs on mine are endplay at the hub. I have quite a bit of "wiggle" on the rim at 12 and 6 O'clock but the endplay is within spec. Not sure if I need new bearings or not. They seem quiet but I don't like the wiggle. Not sure if new ones would be any better. There is no play at 3 and 9 O'clock.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra