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Is a 10W-40 Motor Oil Better for a High-Mileage Pickup?
 
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Question:
Is a 10W-40 Motor Oil Better for a High-Mileage Pickup?
I bought a used 1997 Ford Expedition with 151,000 miles. It was dealer serviced and had frequent oil changes, but I do not know if synthetic oil was used. Upon purchasing the vehicle, I switched to Mobil 1 full synthetic 5W-30, which is the recommended oil weight. After 3,000 miles, it burned two quarts of oil, but the vehicle has no leaks and tons of power. Should I move to a 10W-40 synthetic in high mileage oil, or stay at 5W-30 in high mileage oil? What do you recommend? Or do you think it was just the truck getting used to the new oil? It used Motorcraft before me since the oil changes were done at the dealership. I drive a combination of highway and street in Southern California, but I have a heavy foot.
-- Philip Raya, Santa Monica, CA
Answer:
Given the model year and vehicle mileage on your Expedition, we would recommend one of our Mobil 1 High Mileage motor oils (5W-30, 10W-30, or 10W-40). If you believe your vehicle is losing oil, the 10W-40 grade may be most appropriate.
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