So this winter the father in law had some health issues and is unable to mow this spring for the time being. I was volunteered to mow for him using his John deer rider. Mowed for a bit and he wanted me to change oil in it as well I said sure. I found the large pre filled filter and apparently have been living under a rock because I had no idea these new John deers use this system, husqvarna man myself. I’m confused on how adding .8 quarts of clean oil to almost 2 quarts of used oil is considered an oil change? To me it seems there would be sludge and other contaminates in the crank all the time using this system. Anyone convert these to using the spin on filter and do the oil change the old fashioned way?