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The reports in the Porsche Forums on Swepco vs the OEM 6-speed trans oil are rather confusing. There are reports good/bad about both oils. The obvious variable seldom mentioned is the condition of the internals of the gearbox. The well known weakness of bearings(the seals fail -just like the IMSB !) and the 2nd gear synchro +dog teeth /pop-out seem a more likely cause of variable results from the two oils?
Part of the reason for the confusion is that there are very few diy gearbox inspection guides. This is a pity because if every time the gearbox was out for clutch/RMS/IMSB work, the gearbox was inspected internally ,it may help? Meanwhile the 'sticky finger' test I mentioned previously is an easy predicter of future bearing problems and perhaps synchro +dog teeth also?
Another issue is that the trans oil is seldom changed as frequently as the gearbox re-builders recommend. Yes the oil change+ the detent mod is expensive -but compared to a gearbox rebuild ,it is a bargain! Justa sk Erik how much a rebuild costs and you'll love the alternative/preventative.
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