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Hi everyone, were going to get our oil changed at new place Valvoline. They say they have full synthetic or conventional oil. I think we have always used a synthetic blend. We are thinking of using full synthetic but i read online that could make the engine leak in older cars. Our car is a 1993 grand marquis it only has 33 thousand miles. So i was wondering for the people here who have older cars like ours is it best to use full synthetic or convectional?
 

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33 thousand miles is not an old car. It is barely broken in. Use the synthetic oil for all the advantages it provides for new cars. Synthetic oil will not cause leaks.
 

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I agree with Bajarider but as always just make sure the correct viscosity rating is used for your engine.
 
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