Cummins Onan ONAMAX 15W40 Oil 326 5336
Onan RV

For best generator performance, we recommend you use Onamax, the Green Label Parts oil specifically formulated for RV generators.

Factory recommended and tested. Maximum protection engine oil formulated to reduce consumption and engine wear due to high temperature oil oxidation and viscosity increase. 32 oz. bottle.

Country Living
Comment by Jim C. on 9th Nov 2014

My Mom and Dad are both in their 80's and live in the country. With the installation of the 6551 I can rest assured that they will never be without power, heat, ac and water. this is a great unit and worked perfectly upon startup. Should have installed this a lot sooner for them.

By the way, my son-in-law also has one for his home. I live in a motorhome or I would have one also.

Read More Customer Reviews