---
product_id: 139941913
title: "Royal Purple HMX w/Synerlec | High Mileage SAE 5W-20 Premium Synthetic Motor Oil |5 Quart | SKU: 17518"
brand: "royal purple"
price: "$191.61"
currency: USD
in_stock: true
reviews_count: 8
category: "Royal Purple"
url: https://www.desertcart.us/products/139941913-royal-purple-hmx-w-synerlec-high-mileage-sae-5w-20
store_origin: US
region: United States of America
---

# Extended oil drain intervals Zinc/Phosphorus anti-wear additive Synerlec film strength technology Royal Purple HMX w/Synerlec | High Mileage SAE 5W-20 Premium Synthetic Motor Oil |5 Quart | SKU: 17518

**Brand:** royal purple
**Price:** $191.61
**Availability:** ✅ In Stock

## Summary

> 🛢️ Drive longer, perform stronger — the premium oil your engine deserves!

## Quick Answers

- **What is this?** Royal Purple HMX w/Synerlec | High Mileage SAE 5W-20 Premium Synthetic Motor Oil |5 Quart | SKU: 17518 by royal purple
- **How much does it cost?** $191.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/139941913-royal-purple-hmx-w-synerlec-high-mileage-sae-5w-20)

## Best For

- royal purple enthusiasts

## Why This Product

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

## Key Features

- • **Engine Armor:** Minimizes wear with fortified zinc/phosphorus additives for peak longevity
- • **Clean Machine:** Stout detergents aggressively remove deposits, maintaining engine cleanliness and performance
- • **Seal Revitalizer:** Chemically restores hardened seals to cut down oil consumption in high-mileage engines
- • **Oxidation Resistance:** Exceptional stability protects oil from breakdown, enabling longer drain intervals and fewer maintenance stops
- • **Synerlec Power Boost:** Proprietary additive technology enhances oil film strength to reduce friction and extend oil life

## Overview

Royal Purple HMX SAE 5W-20 is a premium synthetic motor oil engineered with advanced zinc/phosphorus anti-wear additives and proprietary Synerlec technology. Designed for high-mileage engines, it minimizes wear, restores seal integrity, and maintains engine cleanliness while extending oil drain intervals through exceptional oxidation stability. Ideal for professionals seeking reliable, long-lasting engine performance.

## Description

Royal Purple® HMX® is specifically formulated with robust zinc / phosphorus anti-wear additives and Royal Purple’s proprietary additive technology Synerlec® to minimize wear and restore lost engine performance. HMX is chemically enhanced to revitalize hardened seals reducing oil consumption common in higher mileage engines. Stout detergents remove engine deposits and maintain cleanliness promoting engine longevity. Royal Purple’s advanced Synerlec technology provides an exceptional film strength by reducing friction for peak engine performance. Synerlec also provides outstanding oxidation resistance to safely extend oil drains, and an ionic attraction to metal components maintaining a film of oil on parts minimizing start-up wear.

Review: Good Oil Performance - Premium Oil right here! Tends to take the tick out of the engine idle. Best price is on desertcart.
Review: Great product - Top quality

## Features

- Minimizes wear and restores lost engine performance
- Increased protection against LSPI
- Fortified with Zinc/Phosphorus anti-wear additive
- Proprietary Synerlec additive technology increase oil film strength allowing for longer oil life
- Exceptional oxidation stability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07NYTBP38 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #9,835 in Automotive ( See Top 100 in Automotive ) #151 in Motor Oils |
| Brand | Royal Purple |
| Brand Name | Royal Purple |
| Compatible with Vehicle Type | Boat |
| Container Type | Bottle |
| Customer Reviews | 4.9 out of 5 stars 427 Reviews |
| Included Components | 1x 5 Quart Bottle |
| Item Type Name | motor oil |
| Item Weight | 2 Pounds |
| Liquid Volume | 5 Quarts |
| Manufacturer | Royal Purple |
| Manufacturer Part Number | ROYA17518 |
| Manufacturer Warranty Description | 30 Days |
| Model Number | 17518 |
| Package Information | Bottle |
| SAE J300 Viscosity Grade | 5W-20 |
| Size | Stock |
| UPC | 641330175183 |
| Unit Count | 160 Fluid Ounces |
| Vehicle Service Type | Boat |

## Product Details

- **Viscosity:** 5W 20 SAE Grade
- **Brand:** Royal Purple
- **Vehicle Service Type:** Boat
- **UPC:** 641330175183
- **Automotive Fit Type:** Vehicle Specific Fit

## Images

![Royal Purple HMX w/Synerlec | High Mileage SAE 5W-20 Premium Synthetic Motor Oil |5 Quart | SKU: 17518 - Image 1](https://m.media-amazon.com/images/I/61DBMtMMPrL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good Oil Performance
*by M***O on April 19, 2026*

Premium Oil right here! Tends to take the tick out of the engine idle. Best price is on Amazon.

### ⭐⭐⭐⭐⭐ Great product
*by J***N on May 10, 2026*

Top quality

### ⭐⭐⭐⭐⭐ Good oil
*by L***T on March 16, 2026*

I use this on my wife’s Jeep Wrangler with over 115,000 miles. Recently replaced valve cover gaskets and had little to no varnish on heads! Have always used Royal Purple since owning the Jeep. Using a good oil is just as important as using a good filter!

## Frequently Bought Together

- Royal Purple HMX w/Synerlec | High Mileage SAE 5W-20 Premium Synthetic Motor Oil |5 Quart | SKU: 17518
- Royal Purple HMX w/Synerlec | High Mileage SAE 5W-20 Premium Synthetic Motor Oil |1 Quart | SKU: 17511
- K&N Premium Oil Filter: Protects your Engine: Compatible with Select CHRYSLER/DODGE/ JEEP/RAM Vehicle Models (See Product Description for Full List of Compatible Vehicles), HP-7026

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**Shop now:** [https://www.desertcart.us/products/139941913-royal-purple-hmx-w-synerlec-high-mileage-sae-5w-20](https://www.desertcart.us/products/139941913-royal-purple-hmx-w-synerlec-high-mileage-sae-5w-20)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-10*