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best motor oil
I,m looking for a better motor oil to run in my 2001 24 valve diesel to handle the hard work of towing a 30 ft travel trailer weighing around 6400 to 6600 lbs. I'm leaning toward Royal Purple. Is there any other oil out there having as good a reputation. I'm currently running Delo 400 LE 15w40. Also what oil filter? Harley
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