OnaMax is factory tested to offer maximum protection. The OnaMax engine oil is specially formulated to reduce consumption and engine wear due to high temperature oil oxidation and viscosity increase. All Onan Generators from the factory are shipped with OnaMax .

Factory Tested Maximum Protection Engine Oil
Formulated to Reduce Consumption and Engine Wear Due to High Temperature Due to Oil Oxidation and Viscosity Increase
Outstanding Wear Protection
Strong Shear Stability Provides Stay-In-Grade Performance
Conventional, 1 Quart Bottle

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Reviews

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12 reviews with 5 stars.

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Overall Rating

5.0

4 out of 4 (100%) reviewers recommend this product

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in-store

1 to 4 of 12 Reviews .

1 – 4 of 12 Reviews

Maryland

Review 1

5 out of 5 stars.

Onan oil

5 months ago

Had to order because this was not in store and was recommended by Onan for my generator

Henderson, NV

Review 1

5 out of 5 stars.

Simple and effective

5 months ago

As described. Best price hands down

SweepstakesYes

Yes, I recommend this product.

East Hampton, CT.

Reviews 2

5 out of 5 stars.

Genuine brand oil, quick pickup

10 months ago

DIYer. Wanted OEM oil for Onan generator and Tractor Supply was the best deal and local to me. Proof in case of warranty, too. First time I ordered on line for pickup. Very easy and quick. Store has locker near cash register at front of store. No waiting.

SweepstakesYes

Yes, I recommend this product.

Pennsylvania

Review 1

5 out of 5 stars.

Good Oil

11 months ago

Great oil for keeping my RV generator in top performance. A little pricy but cheaper than any other big box stores.

SweepstakesYes

Yes, I recommend this product.

Cummins OnaMax Oil for use with RV Gasoline/LP Generator Engines, SAE 10W-30

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Reviews

Rating Snapshot

Overall Rating

Review this Product

Onan oil

Simple and effective

Genuine brand oil, quick pickup

Good Oil