This kinda goes along with NRF was saying:
I was reading up on high performance air filters awhile back and one of the manufacturers was saying that the reason your oil gets dirty is because of what the air filter misses. Fine dust gets drawn into the motor through the inlet side of of the crankcase.
Going with what HT1 pointed out: Think of all the eighteen wheelers running nearly 24/7 over the highways. There are two drivers in the truck with each driving a ten hour shift. At 55 mph they would probably be logging somewhere around 1,100 miles a day.
Didn't want to create confusion in the synth oil thread but they go really long intervals between oil changes. Somewhere around 30 - 50 thousand miles ?
Just guessing but most run Delvac synthetic. They have an oil bath air filter. They have auxiliary oil coolers and gallons of oil stored down in the base pan.
Back in the day, my old Ford pickups used eight quarts for an eight cylinder oil change. Nowadays i buy my oil in a five quart jug. Seems like an oddball size but it's just enough for most oil changes now.
Maybe that's part of the difference between heavy equipment and automobiles ?
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