---
product_id: 7341352
title: "GTX High Mileage 20W-50 Synthetic Blend Motor Oil, 5 Quarts"
brand: "castrol"
price: "$135.66"
currency: USD
in_stock: true
reviews_count: 8
category: "Castrol"
url: https://www.desertcart.us/products/7341352-gtx-high-mileage-20w-50-synthetic-blend-motor-oil-5
store_origin: US
region: United States of America
---

# Seal conditioners reduce leaks & engine wear Phosphorus Replacement Tech protects emission system 20W-50 Viscosity Grade for high mileage engines GTX High Mileage 20W-50 Synthetic Blend Motor Oil, 5 Quarts

**Brand:** castrol
**Price:** $135.66
**Availability:** ✅ In Stock

## Summary

> 🛢️ Keep your high-mileage engine young, sleek, and unstoppable!

## Quick Answers

- **What is this?** GTX High Mileage 20W-50 Synthetic Blend Motor Oil, 5 Quarts by castrol
- **How much does it cost?** $135.66 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/7341352-gtx-high-mileage-20w-50-synthetic-blend-motor-oil-5)

## Best For

- castrol enthusiasts

## Why This Product

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

## Key Features

- • **Fuel Economy Enhancer:** Optimized synthetic blend improves fuel efficiency, giving you more miles per gallon without compromise.
- • **Emission System Guardian:** Phosphorus Replacement Technology safeguards your catalytic converter for cleaner, longer-lasting rides.
- • **Engine Longevity Booster:** Specially formulated for vehicles with 75,000+ miles to extend engine life and performance.
- • **Sludge & Burn-Off Fighter:** Superior dispersancy and oil burn-off protection keep your engine cleaner and running smoother than ever.
- • **Leak-Reducing Seal Conditioners:** Advanced additives help minimize leaks, saving you costly repairs and downtime.

## Overview

Castrol GTX High Mileage 20W-50 Synthetic Blend Motor Oil is engineered for vehicles with over 75,000 miles, combining advanced Phosphorus Replacement Technology and superior additives to protect emission systems, reduce sludge, prevent leaks, and improve fuel economy. Trusted by enthusiasts and professionals alike, it delivers exceptional engine wear protection and extends engine life for high-mileage cars, trucks, and SUVs.

## Description

Castrol® GTX® High Mileage 20W-50 is the #1 consumer high-mileage brand, specially formulated for vehicles with over 75,000 miles. It's a synthetic blend motor oil that helps extend engine life providing Superior Protection in 7 Critical Areas including corrosion prevention, sludge control, timing and friction wear. It also contains a proprietary additive to protect the emisssion system. Our Phosphorus Replacement Technology reduces harmful phosphorus to protect the catalytic converter and help extend the life of your high mileage vehicle.

Review: Great quality - This is what I use in my 2003 Chrysler Town and Country minivan w/179k miles.
Review: desertcart has become my go-to motor oil merchant - I could not be happier with this oil. I have been using Castrol GTX regular and High Mileage oils in several cars for 8+ years so you can imagine that I am satisfied with the brand. As for Castrol's GTX High Mileage 20W-50, I have been using it for a while, first purchasing it at parts stores, but this oil was phased out of many stores in my area. I bought most of the stock I could find in the local stores and then pondered the question of what to do when I use it all up. I searched for this oil on desertcart, merely on a whim, and I was ecstatic to find that they sold it for a price much lower than what I was paying in the auto stores. An oil change on my car takes about four quarts, so I first purchased two of these five quart containers. After using them up and a having a great experience purchasing them on desertcart, I went ahead and purchased four more containers to stock up. I do much of my own vehicle maintenance and working on cars a hobby of mine, so oil changes are something that I always do on my own. I use this Castrol in a 1992 Volvo 240 Wagon with 250,000 miles which is a daily driver and I will not use anything else for oil at this point. A specialist for these cars recommended that I try a 20W-50 oil in the B230F in my Volvo. I have been able to keep my engine running very smoothly for its age and mileage through regular oil changes and the use of this quality oil. I am confident that recurrent use of this oil will help me push the Volvo many more miles before needing to do an overhaul (the engine is yet to be overhauled, but that should be no big surprise for anyone who has experience with a B2XX engine Volvo).

## Features

- Phosphorus Replacement Technology helps extend emission system life
- Superior dispersancy that fights sludge build up
- Exceptional oil burn-off protection exceeding industry standards* | Seal conditioners to help reduce leaks
- Advanced additives that help prevent engine wear | Improved Fuel Economy**
- Meets or exceeds the following specifications: API SP/SN PLUS/SN/SM | * Based on API and ACEA volatility specifications | ** In 5W-20, 5W-30 and 10W-30 grades versus industry specifications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00JGQLU5S |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #5,515 in Automotive ( See Top 100 in Automotive ) #93 in Motor Oils |
| Brand | Castrol |
| Customer Reviews | 4.8 4.8 out of 5 stars (2,500) |
| Date First Available | April 4, 2014 |
| Global Trade Identification Number | 00079191231128 |
| Item Weight | 9.55 pounds |
| Item model number | 1597C3 |
| Manufacturer | Castrol |
| Manufacturer Part Number | 1597C3 |
| Model | 03112 |
| Product Dimensions | 11.8 x 9.5 x 4.6 inches |
| SAE J300 Viscosity Grade | 20W-50 |
| Size | 5 Quarts |
| UPC | 079191231128 |
| Vehicle Service Type | For use in vehicles with over 75,000 miles, Passenger cars, trucks, and SUVs |
| Viscosity | 20W 50 SAE Grade |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 160 Fluid Ounces
- **Package Information:** Bottle
- **Vehicle Service Type:** For use in vehicles with over 75,000 miles, Passenger cars, trucks, and SUVs
- **Viscosity:** 20W 50 SAE Grade

## Images

![GTX High Mileage 20W-50 Synthetic Blend Motor Oil, 5 Quarts - Image 1](https://m.media-amazon.com/images/I/61NjaANoy3L.jpg)

## Questions & Answers

**Q: Buenos dias, cual es la medida de la caja con los dos productos?**
A: Las dimensiones de la caja son ‎11.8 x 9.5 x 4.6 pulgadas

**Q: Es lo mismo al semisintetico?**
A: Si. Castrol GTX High Mileage contiene una mezcla de aceites de base sintética y de base convencional.

**Q: Is this thicker oil harder on the oil pump on a car with 280k miles ?**
A: I don't believe this oil should have any effect on the pump simply because of the synthetics in the oil. But why would you want to put that heavy oil in a car unless you use the car real hard or are trying to prolong a problem. I had a 2000 Accord which I bought in 2006 with thirty thousand miles on it. I recently sold the Accord and it had 218,000 miles on it and never used a 20/50 oil. My car still with regular oil changes and routine maintenance checks ran perfect. It never used a drop of oil between oil changes and I have always used Castrol oil in my cars for over 40 years and never had a problem. I always used the 10/30 or 10/40 regular oil and then when I reached the 100,000 mile mark I used the 10/30 or 10/40 high mileage

**Q: Is this product safe?**
A: Castrol GTX High Mileage has a new and improved formula specifically formulated for vehicles with over 75,000 miles however the product still provides the same great engine protection against sludge, oil burn-off and seal protection as the previous formula.

Castrol GTX High Mileage is a premium synthetic blend motor oil formulated with Phosphorus Replacement Technology, which is a unique, patented, and proprietary additive developed by the Castrol Technology Group. This technology enables the use of significantly lower levels of phosphorus, which helps prevent catalytic converter and emission system failure better than conventional and other high-mileage oils that contain higher phosphorus levels.

Although the amount of phosphorus is reduced, Castrol GTX High Mileage is able to maintain an excellent level of wear protection based upon industry wear tests and provides superior performance in other tests compared to industry standards. This ensures that higher-mileage vehicles using GTX High Mileage are well protected against engine wear, deposits, sludge and other potential issues.

The new Castrol GTX High Mileage formula is available in 5W-20, 5W-30, 10W-30 and 10W-40; a new 20W-50 formula will be available later this year. All grades are API SN; the 5W-20, 5W-30 and 10W-30 grades are also ILSAC GF-5. 

Castrol Consumer Relations

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great quality
*by P***Z on January 8, 2026*

This is what I use in my 2003 Chrysler Town and Country minivan w/179k miles.

### ⭐⭐⭐⭐⭐ Amazon has become my go-to motor oil merchant
*by P***J on April 13, 2016*

I could not be happier with this oil. I have been using Castrol GTX regular and High Mileage oils in several cars for 8+ years so you can imagine that I am satisfied with the brand. As for Castrol's GTX High Mileage 20W-50, I have been using it for a while, first purchasing it at parts stores, but this oil was phased out of many stores in my area. I bought most of the stock I could find in the local stores and then pondered the question of what to do when I use it all up. I searched for this oil on Amazon, merely on a whim, and I was ecstatic to find that they sold it for a price much lower than what I was paying in the auto stores. An oil change on my car takes about four quarts, so I first purchased two of these five quart containers. After using them up and a having a great experience purchasing them on Amazon, I went ahead and purchased four more containers to stock up. I do much of my own vehicle maintenance and working on cars a hobby of mine, so oil changes are something that I always do on my own. I use this Castrol in a 1992 Volvo 240 Wagon with 250,000 miles which is a daily driver and I will not use anything else for oil at this point. A specialist for these cars recommended that I try a 20W-50 oil in the B230F in my Volvo. I have been able to keep my engine running very smoothly for its age and mileage through regular oil changes and the use of this quality oil. I am confident that recurrent use of this oil will help me push the Volvo many more miles before needing to do an overhaul (the engine is yet to be overhauled, but that should be no big surprise for anyone who has experience with a B2XX engine Volvo).

### ⭐⭐⭐⭐⭐ Have been using this in my 94 chev pickup for years
*by S***R on October 13, 2025*

Great price

## Frequently Bought Together

- Castrol GTX High Mileage 20W-50 Synthetic Blend Motor Oil, 5 Quarts
- K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Harley Davidson, Buell Motorcycles, KN-171C

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-06*