Cummins Onan | OnaMax Oil | 326-5336 | SAE 15W-40 | 32 Ounce Bottle | Single

Cummins Onan 326-5336 Generator Oil – Premium Engine Oil for RV Generators

Keep your generator running smoothly with Cummins Onan Generator Oil – Part #326-5336. This premium engine oil is specifically formulated for Onan RV generators, providing superior lubrication, heat protection, and long-lasting performance. Whether you’re performing routine maintenance or preparing for a long trip, Cummins Onan 326-5336 oil delivers the protection your generator needs to operate efficiently under varying loads and temperatures.

OnaMax 15W-40 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 15W-40.  Onan generators used in RVs, motorhomes, and mobile power systems. Unlike standard automotive oils, this formula is optimized for the continuous load conditions that RV generators experience.

Key benefits include:

• Excellent engine wear protection

• Improved thermal stability under heavy loads

• Helps reduce engine deposits and sludge

• Maintains proper lubrication for longer engine life

• Designed for reliable RV generator operation

Ideal for Routine Generator Maintenance

Regular oil changes are critical to maintaining the performance and reliability of your generator. Using OEM Cummins Onan oil ensures compatibility with factory specifications and helps keep your generator operating at peak efficiency.

This oil is commonly used during scheduled service intervals for many Onan RV generator models, making it a reliable choice for preventative maintenance.

Key Features

• Genuine OEM Cummins Onan oil

• Part Number: 326-5336

• Formulated specifically for Onan RV generators

• Provides high-temperature protection

• Helps extend engine life and reliability

• Ideal for routine generator maintenance

Why Use Genuine Cummins Onan Oil?

Using genuine Cummins Onan replacement oil helps protect your generator investment by ensuring your engine receives the lubrication it was designed to use. OEM oils are engineered to meet strict performance standards, helping your generator run cooler, cleaner, and more efficiently.

Need help confirming application?

Our team at United RV Parts is here to help you find the right replacement or repair parts for your Cummins Onan Generator.

Text or call 817-984-1852 with the make and model number of your existing Generator and we’ll make sure you get exactly what you need the 1st time.