I agree with Roscoe and Fixit on this one. I did the clean out the cooler bit once and have never did it since. I slowly blew the old
oil out into a can to see just how much there was and even with my long lines I knew then I wasn't going to do it again. Then I refilled the cooler by putting that little bit of new
oil in the line and using air. And I change my
oil way to often for that little bit to matter. The people that built my engine told me I was just wasting time as that little bit of oil wasn't going to make any difference to the new oil, and especially as often as I change it. Besides that it adds enough color for me to see the dipstick easily after I run the motor for a few minutes to get everything circulating. Just a lot of un-necessary work in my engine builders opinion.
Ron
