Changed tractor engine oil

Last weekend I changed the tractor engine oil and filter with some help from John. The tractor now has 143 hours on it and has been running great. I've changed the oil twice before during the break-in period using recommended Kubota 10W-30 oil with API CI-4 plus service rating. Now I have switched over to Shell Rotella T synthetic 5W-40 engine oil with API CJ-4 service rating. My tractor takes 3 gallons of engine oil. It's relatively easy to change the oil on the tractor because there is a lot of clearance underneath (the oil can drain into a 5 gallon bucket) and the oil filter and filler are also easy to access. Our local convenience facility (trash dump) has a special container for used oil.