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1) oil to use 2) valve adj. - remove plugs or not


Vehicle Information: Model: 911 Carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2L; Total Mileage: 105,000;

Bonjour,Question 1:I am stuck with 6 litres of Quaker State 20W50 and 6 litres of Valvoline 15W40. Is it ok to mix the two types for an oil change, or is that absolutely the wrong thing to do ?Question 2:I am reading two type of advice regarding the valve adjustment process. Some articles say to remove the spark plugs, and some others say not to do that because of the risk of carbon deposit giving wrong reading on adjustment. Your views please.Thanks for all your help.

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