Re: Best way to change oil on my mercruiser 140??
Since you have an inline engine, there is probably room to slide a pan underneath the drain plug on the oil pan. That is the best way. However, if you can't do that, then go to your local marina and by a marine engine oil pump and get it out of the dipstick tube. That is the only way on a lot engines unless you install an oil drain hose onto the oil drain plug hole that you can stick out the transom drain hole when you change oil. Hope this helps.