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1990 944S2 oil change

Engine

Vehicle Information: Model(924/944/968): 944 s2; Year: 1990; Body Type: Convertible; Total Mileage: 67000;

When changing from organic oil to sythetic oil is it nessary to flush engine? Plus if I open the drain plug for oil and punch a hole in the top of oil filter will it help empty the filter? Will it hurt anything to try this? Plus once I have all the timing belts put on, do I have to have them retensioned after 1000/2000 miles?

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