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Oil and DE

Engine

Vehicle Information: Year: 1999; Engine (type, size, modifications): 986, 2.5L; Total Mileage: 69000; Transmission: Manual;

I use the car every day, and also do about four DE events a year. Right now, I change the oil using Mobil 1 15W-50 in April, and leave it in there for the entire season of warmer months and DEs (April through October). Then I switch to 0W-40 and leave it in there for the rest of the year. I never go more than 8,000-10,000 miles on the same oil. Do you think I need to change it more often, especially because of the DEs?State: CT

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