---
product_id: 6134566
title: "GTX High Mileage 5W-30 Synthetic Blend Motor Oil, 5 Quarts"
brand: "castrol"
price: "$140.81"
currency: USD
in_stock: true
reviews_count: 11
category: "Castrol"
url: https://www.desertcart.us/products/6134566-gtx-high-mileage-5w-30-synthetic-blend-motor-oil-5
store_origin: US
region: United States of America
---

# Improved Fuel Economy Engine Wear Protection 5W-30 Synthetic Blend GTX High Mileage 5W-30 Synthetic Blend Motor Oil, 5 Quarts

**Brand:** castrol
**Price:** $140.81
**Availability:** ✅ In Stock

## Summary

> 🛢️ Keep your high-mileage ride running like new — because your engine deserves the best!

## Quick Answers

- **What is this?** GTX High Mileage 5W-30 Synthetic Blend Motor Oil, 5 Quarts by castrol
- **How much does it cost?** $140.81 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/6134566-gtx-high-mileage-5w-30-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

- • **Leak Defender:** Advanced seal conditioners reduce leaks, keeping your engine tight and efficient.
- • **Sludge Fighter:** Superior dispersancy formula actively combats sludge buildup for a cleaner engine.
- • **Fuel Efficiency Edge:** Formulated to improve fuel economy, saving you money on every mile.
- • **Engine Longevity Booster:** Phosphorus Replacement Technology extends emission system life and protects catalytic converters.
- • **Trusted High Mileage Formula:** Specifically designed for vehicles over 75,000 miles to maintain peak performance.

## Overview

Castrol GTX High Mileage 5W-30 Synthetic Blend Motor Oil is engineered for vehicles with over 75,000 miles, combining advanced additives and Phosphorus Replacement Technology to protect against engine wear, reduce leaks, fight sludge, and improve fuel economy. It meets or exceeds top industry standards including API SP and ILSAC GF-6, ensuring superior performance and extended engine life.

## Description

Castrol® GTX® High Mileage 5W-30 is 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 product and price - great quality and value castrol is all use
Review: Best Engine Oil - Great price, fast shipping, arrived sealed. Best engine protection by far!!

## 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 | ILSAC GF-6 | Meets Ford WSS-M2C946-B1 | Meets Ford WSS-M2C961-A1 | * Based on API and ACEA volatility specifications | ** In 5W-20, 5W-30 and 10W-30 grades versus industry specifications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00GSQ8MSC |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #693 in Automotive ( See Top 100 in Automotive ) #18 in Motor Oils |
| Brand | Castrol |
| Brand Name | Castrol |
| Compatible with Vehicle Type | For use in vehicles with over 75,000 miles, Passenger cars, trucks, and SUVs |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 8,379 Reviews |
| Global Trade Identification Number | 00079191231029 |
| Included Components | Motor Oil |
| Item Type Name | Motor Oil |
| Liquid Volume | 160 Fluid Ounces |
| Manufacturer | Castrol |
| Manufacturer Part Number | 03102C |
| Manufacturer Warranty Description | 12 Months |
| Model Number | 03102 |
| Package Information | Bottle |
| SAE J300 Viscosity Grade | 5W-30 |
| Size | 5 Quarts |
| UPC | 079191231029 |
| Unit Count | 160.0 Fluid Ounces |
| Vehicle Service Type | For use in vehicles with over 75,000 miles, Passenger cars, trucks, and SUVs |
| Viscosity Level | Medium to High |

## 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:** 5W 30 SAE Grade

## Images

![GTX High Mileage 5W-30 Synthetic Blend Motor Oil, 5 Quarts - Image 1](https://m.media-amazon.com/images/I/613c2Y9hOsL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What is the shell life of motor oil**
A: If it does sit for a few months make sure you shake the bottle well the night or day before the oil change so as to mix up the additive pack that might have settled while sitting and waiting. It suspends well for a month or 2 but after that the add pack might end up at the bottom of the bottle and that wouldn't be good. You really want those additives working in your engine.

**Q: how long time that oil last for chevrolet cobalt lt 2009 has 130.000 miles ?**
A: I have a 2009 Cobalt. I change my oil when the indicator comes up on the dash. Usually within the time frame of 5 -1 % of life left. My Cobalt has almost 200,000 miles on it. The computer actually knows when the oil needs changed. How? The computer calculates the length of time the car runs, temperatures the car is exposed and more. In effect, the computer knows when the oil is losing it's level of viscosity. Viscosity = Sticky. Oil needs to be sticky to cling to the internal parts of the engine. Again, oil must be sticky to be protect the engine. Trust me, the car's computer knows. The only way the car doesn't know is if you don't start it and or you don't drive it.  In that case, you would need to change the oil far more often.  The worst effect any engine deals with is not being run. Second worst is starting the car and not allowing the engine to reach normal operating temperatures. Start the car and drive it. Doing so causes the moisture in the oil to be burned off. Moisture in the crankcase causes internal rust. Internal rust can damage the crank bearings. I have 4 GM cars. They all have high mileage. Let the car tell you when to change the oil. Btw, I use this oil in all my cars. It's among the best.

**Q: synthetic or conventional?**
A: This is a full synthetic in its current form. Previous incarnations were a blend.

**Q: Is this full synthetic or synthetic blend? It's listed under both categories in your homepage.**
A: THIS PRODUCT IN 5W-20 IS A SYNTHETIC BLEND. CALLED CASTROL 12/12/19. THEY NO LONGER MAKE CONVENTIONAL FORMULA FOR THIS WEIGHT. ANY QUESTIONS, CALL 888-227-8765.

## Customer Reviews

### ⭐⭐⭐⭐⭐ great product and price
*by G***T on April 3, 2026*

great quality and value castrol is all use

### ⭐⭐⭐⭐⭐ Best Engine Oil
*by R***G on March 2, 2026*

Great price, fast shipping, arrived sealed. Best engine protection by far!!

### ⭐⭐⭐⭐⭐ Good 👍
*by J***K on May 2, 2026*

👍

## Frequently Bought Together

- Castrol GTX High Mileage 5W-30 Synthetic Blend Motor Oil, 5 Quarts
- FRAM Extra Guard PH4967, 10K Mile Change Automotive Replacement Interval Spin-On Engine Oil Filter for Select Vehicle Models

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-08*