Ive blown air filters out for years. At a dirty location swapped every pm. At a clean location blow it out 4 to 5 times then change. 30000 plus hrs on some machines with no engine failure. The transmission issue however is one that I can understand, my branch will not change it under contract and the customer dont want to pay for it. Resulting in 5 to 10 failures in the last 15 years. Oil is cheap compared to engines or transmissions change that stuff and have a piece of mind. Sorry for the rant got to go and not change some trans fluid today.