---
product_id: 10622781
title: "Cummins Onan OnaMax 15W-40 32 oz. Generator Engine Oil 326-5336 | Genuine Onan Green Label Parts"
brand: "cummins"
price: "¥7283"
currency: JPY
in_stock: true
category: "Cummins"
url: https://www.desertcart.jp/products/10622781-cummins-onan-onamax-15w-40-32-oz-generator-engine-oil
store_origin: JP
region: Japan
---

# Formulated to reduce high-temp oil oxidation SAE 15W-40 viscosity for optimal engine protection Convenient 32 oz. bottle size Cummins Onan OnaMax 15W-40 32 oz. Generator Engine Oil 326-5336 | Genuine Onan Green Label Parts

**Brand:** cummins
**Price:** ¥7283
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your engine running cooler, longer — don’t get left behind!

## Quick Answers

- **What is this?** Cummins Onan OnaMax 15W-40 32 oz. Generator Engine Oil 326-5336 | Genuine Onan Green Label Parts by cummins
- **How much does it cost?** ¥7283 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/10622781-cummins-onan-onamax-15w-40-32-oz-generator-engine-oil)

## 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

- • **Heat-Resistant Formula:** Specially designed to minimize oil breakdown and reduce engine wear at high temperatures
- • **Fuel Efficiency Booster:** Reduces oil consumption, saving you money and extending engine life
- • **Trusted Brand Reliability:** Cummins-backed quality with a 4.8-star rating from over 1,000 users
- • **Perfect Fit for Generators:** Vehicle-specific formulation optimized for generator engines
- • **Precision Viscosity Control:** Engineered SAE 15W-40 grade ensures peak performance under diverse conditions

## Overview

Onan OnaMax SAE 15W-40 Engine Oil is a high-quality conventional oil designed specifically for generator engines. Its heat-resistant formula reduces oil consumption and engine wear caused by high-temperature oxidation. Packaged in a convenient 32 oz. bottle, this Cummins-manufactured oil delivers reliable performance backed by a 4.8-star customer rating.

## Description

Onan OnaMax SAE 15W-40 Engine Oil, 32 oz.

## Features

- MAXIMUM PROTECTION FORMULA: OnaMax 15W-40 engine oil is factory tested to deliver maximum protection for your generator engine.
- FACTORY TESTED PERFORMANCE: Verified through factory testing to meet the demands of Cummins Onan engine applications.
- 15W-40 VISCOSITY GRADE: Multi-viscosity formulation designed for reliable lubrication across a range of operating temperatures.
- BUILT FOR ONAN ENGINES: Formulated as part of the OnaMax engine oil line to match Cummins Onan generator engine requirements.
- TRUSTED GENSET LUBRICANT: A dependable choice for keeping generator engines properly lubricated and protected during operation.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00278MET8 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #4,145 in Automotive ( See Top 100 in Automotive ) #75 in Motor Oils |
| Brand Name | Cummins |
| Compatible with Vehicle Type | Generator |
| Container Type | Bottle |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,078) |
| Global Trade Identification Number | 00690781000704 |
| Included Components | Oil |
| Item Type Name | Oil |
| Item Weight | 1.9 pounds |
| Liquid Volume | 1 liters |
| Manufacturer | Cummins Inc. |
| Manufacturer Part Number | 326-5336 |
| Model Number | 326-5336 |
| Number of Packs | 1 |
| SAE J300 Viscosity Grade | 15W-40 |
| Size | 32 oz |
| UPC | 690781000704 |
| Unit Count | 32 Fluid Ounces |
| Viscosity Level | Medium to High |

## Product Details

- **Brand:** Cummins
- **Liquid Volume:** 1 liters
- **Package Information:** Bottle
- **SAE J300 Viscosity Grade:** 15W-40
- **Vehicle Service Type:** Generator

## Images

![Cummins Onan OnaMax 15W-40 32 oz. Generator Engine Oil 326-5336 | Genuine Onan Green Label Parts - Image 1](https://m.media-amazon.com/images/I/61KPhqAqxcL.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

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/10622781-cummins-onan-onamax-15w-40-32-oz-generator-engine-oil](https://www.desertcart.jp/products/10622781-cummins-onan-onamax-15w-40-32-oz-generator-engine-oil)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-01*