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I can't remember where I saw it, but there is a service interval on Porsche 6-speed manual transmissions. I switched to Mobile 1 Mobilube PTX 75W 90 at 50K miles. They say it shifts better, but I didn't notice any difference. But having a Driveline filler system makes it so easy to fill the transmission, I'd say it was fun even. Didn't spill a drop of oil.
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