Description
Protect your compatible generator with Cummins Onan OnaMax 15W-40 Full Synthetic Generator Engine Oil. This genuine Cummins Onan oil is formulated for generator applications and helps provide dependable lubrication, control friction, and protect internal engine components during extended operation and varying temperature conditions.
This convenient two-quart package contains two one-quart bottles of 15W-40 full synthetic engine oil. It is suitable for select Cummins Onan gasoline generators, including specified Marquis Gold 5500 and Marquis Gold 7000 applications. Always verify your generator’s exact model, specification letter, recommended oil viscosity, and crankcase capacity before use.
Cummins Onan OnaMax 15W-40 Full Synthetic Generator Engine Oil Features
This OnaMax engine oil is designed for compatible generator engines and routine maintenance.
Key features include:
- Genuine Cummins Onan oil: An engine oil product from the Cummins Onan brand.
- 15W-40 viscosity: Matches the stated viscosity of this product. Confirm that your generator requires this grade.
- Full synthetic formulation: Provides the specified synthetic oil formulation for compatible generator applications.
- Engine lubrication: Helps control friction and protect internal engine components from wear.
- Generator maintenance: Supports lubrication during demanding generator operation and extended running periods.
- Convenient package size: Includes two separate one-quart bottles, providing a total of two quarts.
- Selected model compatibility: Suitable for specified Cummins Onan gasoline generator applications.
Choose the correct oil based on the requirements in your generator’s owner’s manual rather than relying on the brand name or viscosity alone.
Compatible Cummins Onan Generator Models
This two-quart package is intended for select Cummins Onan gasoline generator applications. The listed compatible models include:
- HGJAB
- HGJAC
- HGJAE
- Select Marquis Gold 5500 generators
- Select Marquis Gold 7000 generators
Compatibility can depend on the exact generator model and specification letter. Check the identification label on your generator and compare it with the information in the owner’s manual before ordering or performing an oil change.
Do not assume that every generator in the Marquis Gold 5500 or Marquis Gold 7000 range uses the same oil. Confirm the recommended viscosity and other oil requirements for your particular unit.
Product Specifications
Review the following specifications before purchasing Cummins Onan OnaMax 15W-40 Full Synthetic Generator Engine Oil.
| Specification | Details |
|---|---|
| Brand | Cummins Onan |
| Product line | OnaMax |
| Oil viscosity | 15W-40 |
| Oil type | Full synthetic |
| Product type | Generator engine oil |
| Container size | 1 quart per bottle |
| Package quantity | 2 bottles |
| Total volume | 2 quarts |
| Application | Compatible generator engines |
| Listed model families | HGJAB, HGJAC, HGJAE |
| Other listed applications | Select Marquis Gold 5500 and Marquis Gold 7000 generators |
These specifications describe the product and the supplied package. Your generator’s manual remains the reference for determining the correct oil and service quantity.
Package Contents
Each package includes:
- Two one-quart bottles of OnaMax 15W-40 full synthetic engine oil
- Total oil volume of two quarts
The package quantity does not mean that your generator requires all two quarts for an oil change. Actual oil requirements vary by generator model and service procedure.
Generator Oil Change and Maintenance Tips
Using the correct engine oil is an important part of routine generator maintenance. Before starting an oil change, review the service instructions for your specific generator.
Follow these precautions:
- Check the owner’s manual. Confirm the required oil viscosity, specification, and crankcase capacity.
- Verify the generator model. Check the model and specification letter to establish compatibility.
- Follow the prescribed service procedure. Prepare the generator and perform maintenance according to the manufacturer’s instructions.
- Add oil gradually. Check the dipstick as you add oil to monitor the level.
- Avoid overfilling. The engine may not require the entire two-quart package. Stop when the specified oil level is reached.
- Dispose of used oil responsibly. Follow local requirements for collecting and recycling used motor oil.
These steps help you select the correct product and avoid common oil-service mistakes. If you are unsure about the required amount, consult the owner’s manual before adding oil.
Frequently Asked Questions
1. How much oil is included in this package?
The package contains two one-quart bottles of Cummins Onan OnaMax 15W-40 full synthetic generator engine oil, for a total of two quarts. Your generator may require less than the full package for an oil change.
2. Which generators are compatible with this oil?
The listed applications include HGJAB, HGJAC, and HGJAE, as well as select Marquis Gold 5500 and Marquis Gold 7000 gasoline generators. Confirm the exact model and specification letter in your owner’s manual before use.
3. Should I use the entire two-quart package during an oil change?
Not necessarily. The required amount depends on your generator’s crankcase capacity and service requirements. Add oil gradually while checking the dipstick, and do not exceed the specified oil level.
Order Cummins Onan OnaMax Generator Engine Oil
Choose Cummins Onan OnaMax 15W-40 Full Synthetic Generator Engine Oil for your compatible generator’s maintenance needs. The two-bottle package provides two quarts of full synthetic 15W-40 oil in convenient one-quart containers.
Before ordering, verify your generator’s model, specification letter, required oil viscosity, and crankcase capacity. Use the manufacturer’s service instructions to determine the correct quantity for your oil change.




