I know the book says not to use anything thicker than 15-40 due to the close tolerances,but I'm using 20-50 in the 960 and it has cured the valve ticking,It only lasts about 1 second.In the winter I will go back to 10-30.At 186k the engine is not new anymore and by the time I reach the main road the engine is warmed up.I dont want to risk the leak problem with synthetic oil as it doesn't leak right now and the engine has enough miles that it could start to leak.I used 20-50 on my turbo cars and never had a problem with it.has anyone had problem using 20-50,I haven't yet.
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83 242 DL , 92-965, 94-965
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