Why would you use Rotella In a gas engine? True, I've always used 5W-40 full synthetic in my diesels. Why..
By the way Wal Mart brand Super Tech 5W-30 has always equated to Mobil One, so I've used it. Never an issue.
Someone made a comment a week or so ago about a newer light weight oil that makes 3 horsepower on a 400 HP motor. What gives?