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Q: Liqiu moly vs Castrol full syn.

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Service oil change my mech. Is recommended Liqiu moly ?

My car has 91000 miles.
My car has an automatic transmission.

A: Engine oil preference is something that is ...

Engine oil preference is something that is somewhat circumstantial depending on the driving conditions you are used to including weather and driving habits. As you may know a synthetic oil is designed for high performance and high mileage engines that are subjected to high stress conditions requiring ultimate protection from breakdown due to high temperatures. In this case the two oils you are comparing are both synthetics which will provide relatively close to the same protections. What you need to keep in mind is the temperature of the weather during the year where you live, your driving habits and how long in between oil changes you go. For warmer weather (i.e. a place like Phoenix, AZ), you may want a higher viscosity oil which will provide a better protection against breakdown due to high heat. For cooler weather (i.e. a place like North Dakota), you may want a lower viscosity oil which will work better when temperatures are not so high.

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