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I have a 2006 F150. About 130k miles. No smoke, no leaks and changed every 3K, I bought it new. Engine is the 5.4 V8. I occasionally pull a trailer, pop up type, get a few loads of firewood and dump trips. Otherwise nothing too hefty. I've always used conventional 5W20W per the manufacturers suggestion. It's getting near what some would consider high mileage. Are there any recommendations you can offer that have worked out for you? Synthetic, weight, etc., and why.