It would be best, in my opinion, to keep the standard M1 line, the EP line, European Formula, and AFE. No need for AP or the Emissions formulas. I would Consolidate those "features" into EP and make it a 20k mile oil. The can keep the Hi-Mileage formula in the regular M1 line and stop the EP formula....most high mileage engines are getting worn enough that extended changes should not be done anyhow and Regular M1 can easily do up to 10k miles anyway. No need for the Super Syn line - heck they cost the same or more than "real" Mobil 1 in auto stores compared to what you pay at Walmart.