---
product_id: 317127891
title: "GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6"
brand: "castrol"
price: "€ 148.35"
currency: EUR
in_stock: true
reviews_count: 8
category: "Castrol"
url: https://www.desertcart.hr/products/317127891-gtx-classic-20w-50-conventional-motor-oil-1-quart-pack
store_origin: HR
region: Croatia
---

# Compatible with gasoline & alcohol fuels Maintains thick oil film under severe heat High Zinc & Phosphorus for extreme wear protection GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6

**Brand:** castrol
**Price:** € 148.35
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your classic engine roaring with Castrol’s legendary protection!

## Quick Answers

- **What is this?** GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 by castrol
- **How much does it cost?** € 148.35 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/317127891-gtx-classic-20w-50-conventional-motor-oil-1-quart-pack)

## 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 Flexibility:** Works seamlessly with both gasoline and alcohol-based fuels, perfect for classic and modified vehicles.
- • **Foam-Free Reliability:** Minimal foaming means consistent lubrication and less engine stress during high RPMs or heavy loads.
- • **Ultimate Engine Armor:** High zinc and phosphorus formula shields your vintage or performance engine from premature wear and metal fatigue.
- • **Proven Industry Standard:** Meets or exceeds API SJ specs, trusted by enthusiasts and professionals alike for push-rod and flat tappet engines.
- • **Heat-Resistant Performance:** Keeps a tough, thick oil film even under extreme temperatures, ensuring your engine runs smooth and protected.

## Overview

Castrol GTX Classic 20W-50 is a premium conventional motor oil designed specifically for classic, muscle, and performance engines. Its high zinc and phosphorus content provides superior wear protection for engines with high-tension valve springs and performance mods. The oil maintains a thick protective film under extreme heat, resists foaming, and is compatible with gasoline and alcohol fuels. Meeting API SJ standards, it’s the trusted choice for vintage vehicles needing robust lubrication and engine longevity.

## 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: Castrol - Good oil and good price
Review: Castrol Motor Oil, High-Zinc - Highly recommend. Bought this oil for my 1972 VW Super Beetle for the high-zinc additive needed for older air-cooled engines.

## 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 | #5,432 in Automotive ( See Top 100 in Automotive ) #93 in Motor Oils |
| Brand Name | Castrol |
| Compatible with Vehicle Type | push-rod, flat tappet engines and performance cam applications |
| Container Type | Bottle |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,564) |
| 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 |
| SAE J300 Viscosity Grade | 20W-50 |
| Size | 1 Quart, Pack of 6 |
| UPC | 079191218914 |
| Unit Count | 192.0 Fluid Ounces |
| Viscosity | 20W-50 SAE Grade |

## 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

![GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6 - Image 1](https://m.media-amazon.com/images/I/61CUc-w3baL.jpg)

## Available Options

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

## 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

### ⭐⭐⭐⭐⭐ Castrol
*by J***L on April 16, 2026*

Good oil and good price

### ⭐⭐⭐⭐⭐ Castrol Motor Oil, High-Zinc
*by J***Y on February 27, 2026*

Highly recommend. Bought this oil for my 1972 VW Super Beetle for the high-zinc additive needed for older air-cooled engines.

### ⭐⭐⭐⭐⭐ good oil, extra ZDDP for older motors
*by D***S on January 11, 2026*

good price, fast delivery

## 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 Croatia*
*Store origin: HR*
*Last updated: 2026-05-17*