Is your intent to increase oil capacity, extend oil change frequency or both? If you're looking to extend the frequency, I've been using M1 oil & filters on my 4R and Amsoil oil & filters on my Mustang. Both vehicles get oil/filter changes at 8k-10k miles. My 2 previous 4R's were on the same schedule. After more than 200,000 miles per truck, not one ever had an oil related issue.