Just a quick note that AmazonBasics now has a possible Rotella T6 killer. It's a 5w-40 CK-4 synthetic. A few testing sites (some professional, some not) have all found the new AmazonBasics oil to be of high quality. I still have a good stock of T6 but after I've used that, maybe it's worth a try. 

Amazon making oil now  they must be stopped before they take over the world, ahhh never mind too late....