bp-guy Posted October 27, 2008 Posted October 27, 2008 I have an ONAN 4000 on my motorhome. It doesn't have an oil filter on it so all I need to do is change the oil. My question is--- Is there a specific oil weight I should be using and does ONAN require a certain brand? I know I could just call a dealer to find out but this might help others on here as well as me so I am asking here. Thanks Quote
Richard Cheese Posted October 27, 2008 Posted October 27, 2008 http://www.cumminsonan.com/rv/ the pages with the manuals are down, but when they were up, they were asking for the model number Quote
KEN Posted October 27, 2008 Posted October 27, 2008 I have an ONAN 4000 on my motorhome. It doesn't have an oil filter on it so all I need to do is change the oil. My question is--- Is there a specific oil weight I should be using and does ONAN require a certain brand? I know I could just call a dealer to find out but this might help others on here as well as me so I am asking here. Thanks Call Johnnie Walker RV Center....They can answer all your generator questions. I think they even have a generator service special going on now....877-879-4750 ask for Jeremy he is the best over there. Quote
White Rhino Posted October 27, 2008 Posted October 27, 2008 Tim I always use Onan, I dont know if its required or not, but better safe than sorry. are you sure there is no filter? Camping world has all that shizzle Quote
bp-guy Posted October 27, 2008 Author Posted October 27, 2008 Tim I always use Onan, I dont know if its required or not, but better safe than sorry. are you sure there is no filter? Camping world has all that shizzle I am positive there is no filter, I looked everywhere and don't see it. I was told that some generators don't have them. Maybe it's because I have a smaller generator. I will use the Onan oil. It only cost $4 bucks a quart and only needs 1.6 quarts. I don't want to be cheap on $8 bucks for the correct oil. Thanks for the input guys! Quote
Ooo Posted October 27, 2008 Posted October 27, 2008 (edited) When I worked at Bell Trans they had about 300 of these on the busses for the air conditioner. They did a test and found that replacing 1/4 of the oil with Marvel Mystery Oil really extended the life of them. Edited October 27, 2008 by chris1223 Quote
sandseeker Posted October 27, 2008 Posted October 27, 2008 I have the same generator there is no filter I was told by my rv guys to use 30 wt mobil 1 synthetic it works real good in mine Quote
Reddog Posted October 28, 2008 Posted October 28, 2008 I agree with sandseeker, mobil one for most of my toys. Synthetics are proven to hold up longer. Make sure you thread the drain plug by hand. I learned that one the hard way!! Quote
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