I also changed my
oil often and one time I did use low pressure air and disconnect the cooler lines and blew it out. The amount was so little and not dirty that I never did it again. My cooler and lines held just enough that after I changed
oil and filter and added the new
oil, once I ran it long enough for the new oil to circulate it added just enough color that it was easy for me to see on the dipstick instead of having to take it out in the sun to see where my oil was.
Ron