---
product_id: 281393836
title: "Onan OnaMax SAE 15W-40 Engine Oil, 32 oz."
brand: "cummins"
price: "702 Lei"
currency: RON
in_stock: true
reviews_count: 5
category: "Cummins"
url: https://www.desertcart.ro/products/281393836-onan-onamax-sae-15w-40-engine-oil-32-oz
store_origin: RO
region: Romania
---

# High-temp oxidation resistance reduces engine wear SAE 15W-40 viscosity for optimal engine protection 32 oz. factory-tested premium conventional oil Onan OnaMax SAE 15W-40 Engine Oil, 32 oz.

**Brand:** cummins
**Price:** 702 Lei
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your generator running like clockwork with OnaMax – the oil pros swear by!

## Quick Answers

- **What is this?** Onan OnaMax SAE 15W-40 Engine Oil, 32 oz. by cummins
- **How much does it cost?** 702 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/281393836-onan-onamax-sae-15w-40-engine-oil-32-oz)

## Best For

- cummins enthusiasts

## Why This Product

- Trusted cummins brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Viscosity You Can Trust:** SAE 15W-40 grade ensures consistent oil flow and protection in diverse conditions.
- • **Reduce Maintenance Hassles:** Minimizes oil consumption and viscosity increase, keeping your generator running smoother, longer.
- • **Exclusive Quality Assurance:** Cummins-backed manufacturing guarantees premium, reliable oil not found in typical auto stores.
- • **Precision Engine Protection:** Factory-tested to maximize engine longevity and reduce wear under high temperatures.
- • **Tailored for Onan Generators:** Specifically formulated and recommended by Onan for seamless generator performance.

## Overview

Onan OnaMax SAE 15W-40 Engine Oil is a 32 oz. premium conventional oil, factory-tested and recommended by Onan for their generators. It offers superior protection against high-temperature oxidation and viscosity changes, reducing engine wear and oil consumption. Manufactured by Cummins, this oil ensures reliable, long-lasting performance tailored specifically for Onan generators.

## Description

Onan OnaMax SAE 15W-40 Engine Oil is factory tested to offer maximum protection. OnaMax Engine Oil is a conventional, non-synthetic oil 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.

Review: One thing I've learned after buying an RV is that the ONAN generators are very particular. I only use ONAN product/parts. This oil is a little pricey but is excellent quality and what ONAN recommends.
Review: Perfect for my RV generator. I don't know why but you can't purchase this product at a automotive store. Only desertcart or Cummins.

## Features

- manufacturer: Generic
- Item Trademark: GENERIC
- Item Weight: pounds, pounds, 1.00, 1.00
- Item Category: Auto Oil

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00278MET8 |
| Best Sellers Rank | #74,777 in Automotive ( See Top 100 in Automotive ) #772 in Automotive Oils |
| Brand | Cummins |
| Customer Reviews | 4.8 4.8 out of 5 stars (980) |
| Date First Available | 14 August 2012 |
| Item Weight | 871 g |
| Item model number | 3265336 |
| Manufacturer | Cummins |
| Manufacturer Part Number | 326-5336 |
| Product Dimensions | 22.86 x 10.8 x 6.99 cm; 870.9 g |
| Viscosity | 15w-40 |

## Product Details

- **Brand:** Cummins
- **Liquid volume:** 1 Liters
- **Package information:** Bottle
- **Vehicle service type:** Car
- **Viscosity:** 15w-40

## Images

![Onan OnaMax SAE 15W-40 Engine Oil, 32 oz. - Image 1](https://m.media-amazon.com/images/I/61ica2HVebL.jpg)

## Questions & Answers

**Q: Is this for gasoline engines?**
A: This is for Onan gas generators

**Q: Can i use this in a wood chipper with a 4 cycle engine?**
A: If your wood chipper requires 15w 40 weight oil this would most likely meet the motors requirements.

**Q: Why is the price 2x srp?**
A: Yes

**Q: It will work for 2022 Ram 2500 diesel?**
A: Yes.  It makes any diesel fuel become premium diesel.  The 2022 Cummins may not NEED it as much as an older high mileage diesel,  but will still get benefit from it

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***E on 5 September 2025*

One thing I've learned after buying an RV is that the ONAN generators are very particular. I only use ONAN product/parts. This oil is a little pricey but is excellent quality and what ONAN recommends.

### ⭐⭐⭐⭐⭐ Review
*by D***N on 15 October 2025*

Perfect for my RV generator. I don't know why but you can't purchase this product at a automotive store. Only Amazon or Cummins.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 22 September 2025*

No issues

## Frequently Bought Together

- CUMMINS NW Cummins 3265336 Onan SAE 15W-40 Oil - 1 Quart
- CUMMINS NW Cummins Onan 122-0836 Oil Filter (Packaging May Vary)
- CUMMINS NW Cummins 1403116 Onan Air Filter

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**Shop now:** [https://www.desertcart.ro/products/281393836-onan-onamax-sae-15w-40-engine-oil-32-oz](https://www.desertcart.ro/products/281393836-onan-onamax-sae-15w-40-engine-oil-32-oz)

---

*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-03-09*