Does Mobil 1 10w-40 High Mileage have a higher viscosity then most 10w-40 oils. I am currently using it in a older, high mileage (159k), Toyota Camry with a 2L engine that has hydraulic lifters. The car seems to labor at bit more starting up when cold or at idle after I put this oil in. Runs fine with this oil otherwise. It was not like that when I had 10w-40 mineral based oil in the car. The owner's manual lists 5 different grades of oil that can be used in the car, depending on conditions...5w-30 to 20w-50. 10w-40 seems like the best choice in my area, based on weather. (moderate coastal climate) So, I am looking at trying the Mobil 1 10w-30 high mileage or maybe the Mobil 1 0w-40. My car does not leak oil and although is 23 years old, the body and interior are in almost show room like condition...basically, it a classic and I am looking for the best protection for the engine
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