---
product_id: 412030459
title: "Castrol GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts"
brand: "castrol"
price: "3903402₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Castrol"
url: https://www.desertcart.vn/products/412030459-castrol-gtx-classic-20w-50-conventional-motor-oil-5-quarts
store_origin: VN
region: Vietnam
---

# Thermal degradation resistance under severe conditions Universal fit for classic & performance engines High Zinc & Phosphorus for extreme wear protection Castrol GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts

**Brand:** castrol
**Price:** 3903402₫
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your classic engine roaring with legendary protection!

## Quick Answers

- **What is this?** Castrol GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts by castrol
- **How much does it cost?** 3903402₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/412030459-castrol-gtx-classic-20w-50-conventional-motor-oil-5-quarts)

## 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:** Ensures smooth engine operation with minimal foaming and maximum stability.
- • **Thick, Tough Oil Film:** Maintains optimal lubrication even under extreme heat and pressure.
- • **Proven Classic Formula:** Meets API SJ standards, trusted by muscle car enthusiasts and collectors alike.
- • **Engine Armor with High ZDDP:** Protects vintage and high-performance engines from wear and metal fatigue.

## Overview

Castrol GTX Classic 20W-50 is a premium conventional motor oil designed specifically for classic cars, muscle cars, and performance engines. Featuring high zinc and phosphorus content, it delivers superior wear protection and maintains a durable oil film under extreme conditions. Compatible with gasoline and alcohol fuels, it meets API SJ standards and is ideal for push-rod, flat tappet, and performance cam engines, ensuring your vintage ride runs smoothly and reliably.

## 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: good oil, extra ZDDP for older motors - good price, fast delivery
Review: Best stuff for pre-1970 cars. - I use it on my 1960 MGA because of the high zinc content. Delivery was very quick.

## 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 | B09QXWLY2Y |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #5,554 in Automotive ( See Top 100 in Automotive ) #93 in Motor Oils |
| Brand | Castrol |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,518) |
| Date First Available | January 21, 2022 |
| Global Trade Identification Number | 00079191220085 |
| Item Weight | 9.62 pounds |
| Item model number | 15E809 |
| Manufacturer | Castrol |
| Manufacturer Part Number | 15E809 |
| Model | GTX Classic 20W-50 Conventional |
| Product Dimensions | 8.31 x 4.56 x 12.75 inches |
| SAE J300 Viscosity Grade | 20W-50 |
| Size | 5 Quarts |
| Vehicle Service Type | push-rod, flat tappet engines and performance cam applications |
| Viscosity | 20W-50 SAE Grade |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 5 Quarts
- **Package Information:** Jug
- **Vehicle Service Type:** push-rod, flat tappet engines and performance cam applications
- **Viscosity:** 20W-50 SAE Grade

## Images

![Castrol GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts - Image 1](https://m.media-amazon.com/images/I/71OX2UN3L1L.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

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

good price, fast delivery

### ⭐⭐⭐⭐⭐ Best stuff for pre-1970 cars.
*by 4***S on January 9, 2026*

I use it on my 1960 MGA because of the high zinc content. Delivery was very quick.

### ⭐⭐⭐⭐⭐ Awesome Performance – Perfect for Lawn Equipment
*by L***E on July 7, 2025*

I’ve been using Castrol GTX Classic 20W-50 in my lawn equipment, and it’s been absolutely great. It provides solid protection, smooth operation, and helps extend the life of my mower and trimmer. This oil is especially good for older engines or small engines that run hot and need a thicker oil. The only downside is that it’s hard to find in stores, so I usually have to order it online. But when I can get it, it’s worth every penny. If you're maintaining older engines or heavy-duty lawn tools, this oil is a reliable choice. Highly recommended!

## Frequently Bought Together

- Castrol GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts
- Motorcraft FL-1A Oil Filter

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-01-31*