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Paul
Brand

Brand: Heavier oil can help high-mileage engines

Q: I own a 1994 GMC 3/4-ton van with a 350 engine. In the last year, the oil pressure has been low, just above the red, and the low warning indicator is on at idle. When I speed up, the pressure goes up. I change the oil every 4,000 miles. At the last oil change I changed it to 10W-40 although the manual calls for 5W-30; this seems to have helped the oil pressure. Is it OK to continue with 10W-40 oil? The van has 145,000 miles on it.

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