snowhound 103 #1 Posted November 18, 2018 What oil filter does an Onan 18 take? Share this post Link to post Share on other sites
WildHorses 378 #2 Posted November 18, 2018 Engine Oil filter: WIX 51762 Napa 1762 is the LONG filter, 1374 short. Carquest 85762 is the LONG filter, 85374 is the short. Long sticks out past the flywheel shroud and short is about even with it. Some tractors can't fit the long but it's difficult to get the short one off. I generally use the long one if it fits. 1 Share this post Link to post Share on other sites
lynnmor 6,762 #3 Posted November 18, 2018 There should be a 122-0502 oil filter to shroud gasket that seals the gap around the oil filter, without this part, much cooling air escapes. Short filters have more of a tendency to lose this part, so use the long one if at all possible. You will often find this part missing on used Onans and it may well be one of the causes of valve seat failure. 1 1 Share this post Link to post Share on other sites
