---
product_id: 671195504
title: "GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts"
brand: "castrol"
price: "49273 som"
currency: KGS
in_stock: true
reviews_count: 5
category: "Castrol"
url: https://www.desertcart.kg/products/671195504-gtx-classic-20w-50-conventional-motor-oil-5-quarts
store_origin: KG
region: Kyrgyzstan
---

# Thermal degradation resistance under severe conditions High Zinc & Phosphorus for extreme wear defense 20W-50 viscosity for robust engine protection GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts

**Brand:** castrol
**Price:** 49273 som
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your classic engine roaring with Castrol GTX Classic – where vintage meets performance!

## Quick Answers

- **What is this?** GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts by castrol
- **How much does it cost?** 49273 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/671195504-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:** Seamlessly works with gasoline and alcohol-based fuels, keeping your ride smooth and reliable.
- • **Proven Classic Fit:** Specifically designed for push-rod, flat tappet engines and performance cams, meeting or exceeding API SJ standards.
- • **Thick Oil Film Power:** Maintains a tough, thick oil film even under extreme heat and pressure, perfect for muscle and collector cars.
- • **Foam-Free Performance:** Minimal foaming ensures consistent lubrication and peak engine efficiency during high-stress drives.
- • **Ultimate Engine Armor:** High Zinc and Phosphorus formula shields your classic engine from premature wear and metal fatigue.

## Overview

Castrol GTX Classic 20W-50 is a premium conventional motor oil engineered for vintage and performance engines. Its high zinc and phosphorus content provides superior wear protection, especially for push-rod and flat tappet engines. With excellent thermal stability and minimal foaming, it ensures reliable lubrication under extreme conditions, making it the go-to choice for muscle cars, hot rods, and collector vehicles.

## 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
Review: Best stuff for pre-1970 cars.

## 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 |
| Brand | Castrol |
| Brand Name | Castrol |
| Compatible with Vehicle Type | push-rod, flat tappet engines and performance cam applications |
| Container Type | Jug |
| Customer Reviews | 4.8 out of 5 stars 1,425 Reviews |
| Global Trade Identification Number | 00079191220085 |
| Included Components | Motor Oil |
| Item Type Name | Motor Oil |
| Liquid Volume | 5 Quarts |
| Liquid volume | 5 Quarts |
| Manufacturer | Castrol |
| Manufacturer Part Number | 15E809 |
| Package information | Jug |
| Unit Count | 160 Milliliters |
| Vehicle service type | push-rod, flat tappet engines and performance cam applications |
| Viscosity | 20W-50 |

## 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

## Images

![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 11 January 2026*



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



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



## Frequently Bought Together

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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.kg/products/671195504-gtx-classic-20w-50-conventional-motor-oil-5-quarts](https://www.desertcart.kg/products/671195504-gtx-classic-20w-50-conventional-motor-oil-5-quarts)

---

*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-19*