2002 Saturn Vue Ecotec 4 cylinder/manual trans. Low mileage engine that I installed which doesn't use any oil. Any one that has driven a manual trans Vue will know what I'm talking about. These things are geared very low. 62 mph is around 2800 RPMs, and god forbid you go on the expressway. Its all good though because the gearing is what allows the 4 cylinder to have enough grunt to pull a small trailer around so it really is a perfect vehicle for me. All that said though, at least in my mind, it really seems critical to get the proper oil to minimize losses when revving that high at cruise RPM.. much more than another car that cruises at a far lower RPM. Living in Wisconsin we obviously have very cold weather (was -7 when I got up today) so that would be a factor. So ultimately I'm looking for lowest losses from a high winding cruise RPM, and I will be using it to tow from time to time. I already have Royal purple synchromx in the transmission. Any suggestions would be much appreciated!