Thicker oil is not necessarily an upgrade. Unless you install an oil pressure gauge to monitor the oil pressure, I would not recommend using 20w50. Without knowing oil pressure, there is no way to tell if the system can handle it, that is, until your pump seizes.
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Collin
1995 L AWD
Locker
1987 Porsche 944 turbo
80k miles. MBC + Chips. Relatively Stock
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