I've got a 2011 F150 with 5.0L coyote. I bought it with 55k miles on it, changed the oil first thing with a motorcraft filter and royal purple 5w-20 full synthetic (factory recommended oil weight). Checked oil shortly after first change maybe 1500 miles, and it was a quart low. Added more oil. Went through 2 more oil change cycles both times had to add around a quart of oil. After that I put an oil separator on the pcv lines and the consumption decreased from a full quart to less half a quart or sometimes even less. The truck now has 79k miles, I don't drive it every day often sits for 4 to 5 days a week. Now probably 1 out of 5 times starts after sitting the timing chains will slap where the tensioners aren't holding. Would swapping to 10w-30 help any of these issue or make them worse ? Also thinking of swapping to amsoil full synthetic.
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