I have never seen a semi engine with much over 13 gallons in the KTA 450/ 600 hp Cummins engines . Those were nice engines.I just read where a trucking company with the help of Mobil and Cummings have gone to a 60K mile OCI and keeps the engine in warranty as long as they do oil analysis every 10K.
Is it the fact that the 'Big Trucks" have 20-40 gallon oil capacity and the fact that diesel fuel itself is oily that allows such long intervals whereas, gas engines have much lower oil capacity and the fuel itself isn't "oily"?
Extending Oil Drain Intervals With Mobil Delvac 1300 Super
A commercial trucking fleet utilizes Mobil Delvac 1300 Super to increase their fleet's oil drain intervals by 50,000 miles.www.stern.co
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