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

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Q: 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.

Q: 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

Q: 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.

Product ID: 412030459

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Details

Viscosity
20W-50
Brand
Castrol
Vehicle Service Type
push-rod flat
Automotive Fit Type
Universal Fit
Global Trade Identification Number

🔥Thermal degradation resistance for engine longevity

⚙️20W-50 viscosity for universal engine compatibility

🛡️High Zinc & Phosphorus for extreme wear protection

Frequently Bought Together

Castrol GTX Classic 20W-50 Conventional Motor Oil, 5 Quarts

Motorcraft FL-1A Oil Filter

Description

🛢️ Power your ride with Castrol – where performance meets protection!

FOAM FREE PERFORMANCE - Minimal foaming ensures consistent lubrication and peak engine efficiency.
FUEL COMPATIBILITY FLEX - Works seamlessly with both gasoline and alcohol-based fuels for versatile use.
STAY COOL UNDER PRESSURE - Maintains a tough, thick oil film that resists thermal breakdown even in extreme heat.
UNMATCHED ENGINE DEFENSE - High Zinc and Phosphorus formula shields your engine under the harshest conditions.
TRUSTED INDUSTRY STANDARD - Meets or exceeds API SJ specs, guaranteeing reliable, professional-grade protection.

Castrol GTX Classic 20W-50 is a premium motor oil engineered for push-rod and flat tappet engines, delivering superior wear protection with high Zinc and Phosphorus content. Its robust formula maintains a thick oil film under severe conditions, resists foaming and thermal degradation, and is compatible with gasoline and alcohol fuels. Meeting API SJ standards, this 5-quart oil ensures universal fit and reliable engine performance.

Specifications

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
SAE J300 Viscosity Grade	20W-50
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

Have a Question? See What Others Asked

How much zinc ppm?

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

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

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

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