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Hi Scotty, I am a big fan of yours. I have a question regarding the engine oil. There are companies clamming their oil will last up to 15k and 20k miles but If my car manufacturer recommendation is to change oil every 6500miles, what difference does it makes to go for 20k miles oil? aren't am I suppose to follow manufacturer recommendation for oil change intervals ? Please let me know which recommendation I need to follow ?
Thank you

20 thousand is special, ONLY for newer engines that are driven almost ONLY on the highway at highway speeds. Highway driving is equivalent to about 10 percent that of city wear. Change yours 6500 if you're smart.

Thank you so much for guidance and quick response