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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15262
Experience:  Certified on Onan and Generac generators
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I have an onan generator, 15.0 KVA, 3- phase. What weight

Customer Question

I have an onan generator, 15.0 KVA, 3- phase. What weight oil goes in it and how much? Thanks, *****: What's the make and model of the generator? And can you guesstimate how old it is?
Customer: It is about 20 years old, and the make and model are almost unreadable. It was serviced about 2 years ago and the battery still turns.
JA: Do you plan on doing the work yourself?
Customer: Yes, I think it just needs oil.
JA: Anything else we should know to help you best?
Customer: It has no oil or oil pressure now.
Submitted: 1 month ago.
Category: Small Engine
Expert:  Hank F. replied 1 month ago.

Hello, my name is ***** ***** I am going to assist you with this.

what oil to use depends on the model.

If it is a diesel unit, use a good diesel rated oil, such as Rotella or Delo, which are both 15W-40.

If it is a gas unit, you can use a straight 30W.