mryanpilarski 24 #1 Posted April 6, 2021 For you B43M guys, what oil is happiest in this motor? I went with straight 30w dino and its OK, just wondering if there is anything else you guys have tried that works wonders. Also wondering if going to a synthetic blend or full synthetic helped or had no effect at all Share this post Link to post Share on other sites
WHX?? 51,733 #2 Posted April 6, 2021 I use Mobile One in 10w30 syn. flavor in both the engine and hydro just to avoid having to stock different oils. All of my Onans are snow tractors tho. Share this post Link to post Share on other sites
Achto 29,394 #3 Posted April 6, 2021 Manual calls for 30w for summer use. 5-20w for 20f to -20f Share this post Link to post Share on other sites
WHX?? 51,733 #4 Posted April 6, 2021 I will change to 5w next to help the hydros abit. Nothing wrong with a good straight 30 for strictly summer use. Share this post Link to post Share on other sites
lynnmor 7,814 #5 Posted April 6, 2021 I use 30W Kohler oil since all of the SN and higher oils have reduced the anti-wear additives. Kohler has a 10W-30 semi-synthetic if you want to run in colder temperatures. Share this post Link to post Share on other sites
