Q: High mileage and oil grade.

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I currently use 10W30 in my 99 Acura with over 195,000 miles. Should I start using 10W40 with her at this high of miles?

My car has 195878 miles.
My car has an automatic transmission.

The oil that the manufacturer recommends is 5w30 and it is the only oil that you should use. If you try to use a thicker 10w30 or 10w40 then you may be not lubricating the engine good enough. The thicker oil will not be able to pass through the small passages inside the motor.

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