I have always changed my oil. However whle we had the 3500 dually, sometimes I just had to have it done, and I don't like carrying a catch can why traveling. Now with the Chevy Kodiak it takes 15 quarts of oil (Rotella 15/40) with filter change and I always change the filter. We change about ever 12,000 miles or 6 months, book says 15,000 under ideal conditions. When we returned to Tennessee, I noticed a big increase in oil price??? I normally by the oil by 5 quart containers, I am now looking for the best price? I will buy about 10 at a time. I carry the used oil to the dump station. The Allison spin on filter I change every 5,000. The only place I have found the new Trans fluid is at the GM dealer and its about $6.00 a quart. But I just fill the spin on and it doesn't take much. Hey guys don't forget the Magnet on top of the oil filter.. GBY...
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