---
product_id: 317127891
title: "Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6"
brand: "castrol"
price: "690.23 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Castrol"
url: https://www.desertcart.tn/products/317127891-castrol-gtx-classic-20w-50-conventional-motor-oil-1-quart
store_origin: TN
region: Tunisia
---

# Extreme Thermal Stability High Zinc & Phosphorus Wear Protection 20W-50 High Viscosity Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6

**Brand:** castrol
**Price:** 690.23 DT
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your classic roaring with Castrol GTX Classic – the ultimate vintage engine guardian!

## Quick Answers

- **What is this?** Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 by castrol
- **How much does it cost?** 690.23 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/317127891-castrol-gtx-classic-20w-50-conventional-motor-oil-1-quart)

## 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 Compatibility:** Works seamlessly with gasoline and alcohol-based fuels for versatile use.
- • **Foam-Free Performance:** Minimal foaming ensures consistent lubrication and peak engine efficiency.
- • **Proven API SJ Standard:** Meets or exceeds industry specs trusted by muscle car and hot rod enthusiasts.
- • **Engine Armor for Classics:** High zinc and phosphorus formula shields vintage engines from wear and metal fatigue.
- • **Thick Oil Film Under Pressure:** Maintains a tough, protective oil layer even in extreme heat and high-tension valve springs.

## Overview

Castrol GTX Classic 20W-50 is a premium conventional motor oil specially formulated for collector, muscle, and race cars. Its high zinc and phosphorus content provides superior wear protection for engines with high-tension valve springs and performance mods. Designed to maintain a thick oil film under severe conditions, it resists foaming and thermal breakdown while being compatible with gasoline and alcohol fuels. This 6-quart pack meets API SJ standards, making it a trusted choice for vintage engine care.

## Description

c/collector cars, muscle cars, hot rods and race cars. It’s high zinc and phosphorus content helps prevent premature aging, wear and metal fatigue on engines with high tension valve springs or performance modifications that create high contact pressure and extreme internal temperatures.

Review: Convenience of shopping on line! Good price! - Quality product, good price!
Review: Good stuff for classics - Great buy

## Features

- High Zinc and Phosphorus for extreme wear protection
- Maintains tough and thick oil film even under severe conditions
- Minimal foaming and high resistance to thermal degradation
- Compatible with gasoline and alcohol-based fuels
- Meets or exceeds the following specification: API SJ

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B093RT3B1W |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #5,188 in Automotive ( See Top 100 in Automotive ) #88 in Motor Oils |
| Brand | Castrol |
| Brand Name | Castrol |
| Compatible with Vehicle Type | push-rod, flat tappet engines and performance cam applications |
| Container Type | Bottle |
| Customer Reviews | 4.8 out of 5 stars 1,628 Reviews |
| Global Trade Identification Number | 00079191218914 |
| Included Components | Motor Oil |
| Item Type Name | Motor Oil |
| Liquid Volume | 6 quarts |
| Manufacturer | Castrol |
| Manufacturer Part Number | 15E809 |
| Manufacturer Warranty Description | 12 months |
| Model Number | 15E809 |
| Package Information | Bottle |
| SAE J300 Viscosity Grade | 20W-50 |
| Size | 1 Quart, Pack of 6 |
| UPC | 079191218914 |
| Unit Count | 192 Fluid Ounces |
| Vehicle Service Type | push-rod, flat tappet engines and performance cam applications |
| Viscosity Level | High |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 6 Quarts
- **Package Information:** Bottle
- **SAE J300 Viscosity Grade:** 20W-50
- **Vehicle Service Type:** push-rod, flat tappet engines and performance cam applications

## Images

![Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 - Image 1](https://m.media-amazon.com/images/I/61CUc-w3baL.jpg)
![Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 - Image 2](https://m.media-amazon.com/images/I/719SXKdFHRL.jpg)
![Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 - Image 3](https://m.media-amazon.com/images/I/5101eg0wGPS.jpg)
![Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 - Image 4](https://m.media-amazon.com/images/I/61aWWN9KZdS.jpg)
![Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 - Image 5](https://m.media-amazon.com/images/I/71gOZlL4e-S.jpg)

## Questions & Answers

**Q: How much zinc ppm?**
A: Castrol GTX Classic 20W-50 contains a typical Zinc level of 1310 ppm and a typical Phosphorus level of 1199 ppm.

**Q: Is this good with a turbo car, Will this oil work well with a 86 Buick turbo car with no catalytic converter**
A: Just my opinion but with a turbo spinning 80k rpm I would be hesitant using 20w50. I would use a lighter weight like 10w40 or less. If you didn't have a turbo I would say it would be fine because you don't have a catalytic converter to foul up.

**Q: Can this be used for a air cooled 1970 vw beetle?**
A: Thank you for contacting Castrol North America.
Castrol GTX Classic 20W-50 is specially formulated to provide unsurpassed wear protection for classic and collector cars as well as racing applications.
Castrol GTX Classic 20W-50 is a new high-performance conventional oil formula for push-rod, flat tappet engines, and performance cam applications.  It’s blended with high zinc (1400 ppm) and phosphorus content to help prevent premature aging, wear, and metal fatigue on engines with high tension valve springs or performance modifications that create high contact pressure and extreme internal temperatures.  Specially formulated engine oil for classic/collector cars, muscle cars, hot rods, and race cars.
Castrol GTX Classic 20W-50 is suitable for use in automotive gasoline engines where the manufacturer recommends an API SJ or earlier specification 20W-50 lubricant.
NOTE: NOT FOR USE IN MODERN ENGINES WITH CATALYTIC CONVERTERS OR WET CLUTCH APPLICATIONS.
Thank you again for contacting Castrol, we value your patronage!

Castrol Consumer Relations

**Q: What are your thoughts on using this in mowers, generators and pressure washers where a 20W-50 is acceptable?**
A: Castrol GTX Classic 20W-50 is a conventional four-stroke motor oil that can be used in applications calling for a 20W-50 motor oil with an API rating of SJ or prior as long as the application it is used in should not use motor oil with high zinc content.  This formula should not be used in modern engines with catalytic converters or wet clutch applications.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Convenience of shopping on line! Good price!
*by J***L on July 19, 2026*

Quality product, good price!

### ⭐⭐⭐⭐⭐ Good stuff for classics
*by S***H on July 20, 2026*

Great buy

### ⭐⭐⭐⭐⭐ Great choice for older vehicles
*by M***E on July 14, 2026*

High zinc oil is recommended for older vehicles with flat tappet valve lifters. Using in 97 jeep 4.0 engine. Runs quiet and smooth in S.C. summer heat. Do not add any other zinc additives when using this oil as too much is not advisable.

## Frequently Bought Together

- Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6
- Motorcraft FL-1A Oil Filter

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-27*