
Originally Posted by
charlie
Shell Rotella T and Mobil Delvac are the choice of most truckers and fleet service. I used to work for Caterpillar (on their construction equipment) and their "CAT" oil is Delvac with their own label on it. If you want to use synthetic, that's fine too- but many of the industrial motors take 4-5 gallons and it gets expensive. Most people will run straight 30 on the older engines and 15-40 on the newer stuff. Multi visc oil (no matter how good) will ALWAYS break down before a straight weight. Since a lot of this stuff gets ignored until there's a problem, some prefer 30. Rotella T is pretty easy to find in local auto parts stores- you may have a tougher time finding Delvac.