I noticed this oil at Walmart and I have been searching for a readily available high quality oil for my 87 Mustang with a built up roller motor. It only comes out in warm weather so cold starts aren't really an issue. My buddy who builds engines for a living said not to use any Rotella products because they will foam at high rpms. Now I have used Rotella T4 in lots of older motors but never anything that revs to 7000. The 5w40 has given me oil consumption issues in the past as well as any 10w30 oil I've used which is why I'd like to try this stuff. What's everyone's thoughts on this oil?