Castrol GTX Classic 20W-50 contains a typical Zinc level of 1310 ppm and a typical Phosphorus level of 1199 ppm.

Is this good with a turbo car, Will this oil work well with a 86 Buick turbo car with no catalytic converter

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.

Can this be used for a air cooled 1970 vw beetle?

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

What are your thoughts on using this in mowers, generators and pressure washers where a 20W-50 is acceptable?

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.

Desertcart Logo

Deliver to Slovakia

For best experience Get the App

DOWNLOAD THE APP

WE SOURCE ITEMS FROM

UAE
UK
India
USA
Japan
KOREA

Customer Services

About Us

Customer Support

Description

🛢️ Power your drive with classic protection that never quits!

FUEL FRIENDLY - Compatible with both gasoline and alcohol-based fuels, perfect for versatile driving needs.
BUILT FOR THE HEAT - Maintains a tough, thick oil film even under the most severe driving conditions—no breakdowns, just performance.
CERTIFIED RELIABILITY - Meets or exceeds API SJ standards, trusted by professionals and enthusiasts alike.
FOAM FREE PERFORMANCE - Minimal foaming ensures consistent lubrication and peak engine efficiency every mile.
ULTIMATE ENGINE SHIELD - High Zinc and Phosphorus formula guards your engine against extreme wear, keeping it running smoother, longer.

Castrol GTX Classic 20W-50 is a premium conventional motor oil designed for push-rod and flat tappet engines, delivering superior wear protection with high Zinc and Phosphorus additives. Its robust 20W-50 viscosity ensures a thick, durable oil film that resists thermal breakdown and foaming, compatible with gasoline and alcohol fuels, and meets API SJ specifications for reliable engine performance.

€ 132.45

Duties & taxes incl.

Slovakiastore

Free Shipping

with PRO Membership

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews

Viscosity	20W-50 sae_grade
Brand	Castrol
Vehicle Service Type	push-rod, flat tappet engines and performance cam applications
Automotive Fit Type	Universal Fit
Global Trade Identification Number	00079191220085
Manufacturer	Castrol
Size	5 Quarts
Model	GTX Classic 20W-50 Conventional
Item Weight	9.63 pounds
Product Dimensions	8.31 x 4.56 x 12.75 inches
Item model number	15E809
Manufacturer Part Number	15E809

CastrolGTX Classic 20W-50 Conventional Motor Oil, 5 Quarts

Details

Description

Specifications

Have a Question? See What Others Asked

Common Questions