Underground
Underground Diesel
Please look into Schaeffers Oils and you will be glad you did. Their Base is by far the best and they are the only ones to add a anti friction lubricant. Mileage and power gains are very common with this oil. My 1000hp Dmax lasted 60k miles with Schaeffers fluid, i beat the crap out of that motor until i finally decided to refresh it. Its the best oil hands down.
http://www.schaefferoil.com/
http://www.schaefferoil.com/