Simply put,XF is a road car oil, EE is a road car + track day oil , CFS is a pure Race oil. Technically XF is a grade 3 oil, EE is a blended grade 3 oil with some Esters ( aka Grade 5), CFS is a grade 5 , pure Ester oil. I hope this helps https://www.demon-tweeks.com/miller-oils-cfs-nt-plus-nanodrive-0w20-synthetic-motorsport-engine-oil-2016633/?sku=MOL7961-5L&istCompanyId=a2904180-3a7d-4e56-b876-cf81c9512180&istFeedId=0f6db192-3a9a-4369-b1f8-79615c622f96&istItemId=wptplqpxw&istBid=t&awaid=6538&utm_source=redbrain&utm_medium=shopping&utm_campaign=css&gclid=CjwKCAjwyIKJBhBPEiwAu7zll6fdGCcXX0Pal1riXl4FZ_j-TxF4UxHa5GORtGe_OCSjYXK5Vs2_oRoCIcIQAvD_BwE Sent from my SM-G781B using Tapatalk