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well crap... i've already put the synchromax in the car though. i did check both the pennzoil and amsoil specs and they confirm your reports. i've no way of knowing what the actual figures are for the GM Synchromesh... but i'll assume you're correct.
i've emailed RP to see what they say. i want a refund from them if they're not willing to back up their product!!
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