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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Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6

Castrol GTX Classic 20W-50 Conventional Motor Oil, 1 Quart, Pack of 6

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: 541903016

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Details

Viscosity
20W-50
Brand
Castrol
Liquid volume
6 Quarts
Package information
Bottle
Vehicle service type
push-rod flat

⛽Compatible with gasoline & alcohol-based fuels

🔥Thermal degradation resistance under severe conditions

🛡️High Zinc & Phosphorus for extreme wear protection

Description

🛠️ Power your passion with classic protection that never quits!

ENGINE ARMOR - High zinc and phosphorus formula shields your engine from premature wear and metal fatigue.
FOAM FIGHTER - Minimal foaming ensures consistent lubrication and peak engine performance.
FUEL FRIENDLY - Seamlessly compatible with both gasoline and alcohol-based fuels for versatile use.
CERTIFIED EXCELLENCE - Meets or exceeds API SJ standards, trusted by muscle car enthusiasts and collectors alike.
STAY THICK STAY STRONG - Maintains a tough, thick oil film even under extreme heat and pressure for ultimate engine durability.

Castrol GTX Classic 20W-50 is a premium conventional motor oil designed for collector cars, muscle cars, and high-performance engines. Its high zinc and phosphorus content provides superior wear protection, maintaining a thick oil film under extreme conditions while resisting thermal breakdown. Compatible with gasoline and alcohol-based fuels, it meets API SJ specifications, ensuring reliable engine care for vintage and modified vehicles.

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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