The giant Caterpillar Diesel generators at work contain 110 gallons of Delo 400 15W 40 each. Every year the oil is changed with about 9 hours of running time on the oil. I have the guys set aside a 55 gallon drum for me to use in my beloved 85 300SD. Since I have plenty I usually change my oil every 2,000 miles or less. I change filters every other oil change. I initially tried it for 1,000 miles and sent in a sample for oil analysis as I was worried about the degradation of the additive package sitting in the generator for a year. My fears were completely unfounded as the oil test results came back absolutely perfect in every category. I know I can get Delo cheap at my local Auto Zone but even at $6 bucks a gallon I'm way ahead of the game and my Benz loves the attention. Comments please??

__________________
Orland Park, IL
1985 300SD 215,000 miles