Question 1

How much zinc ppm?

Accepted Answer

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

Question 2

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

Accepted Answer

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.

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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.

ASIN	B09QXWLY2Y
Automotive Fit Type	Universal Fit
Best Sellers Rank	#5,746 in Automotive ( See Top 100 in Automotive ) #84 in Motor Oils
Brand Name	Castrol
Compatible with Vehicle Type	push-rod, flat tappet engines and performance cam applications
Container Type	Jug
Customer Reviews	4.8 4.8 out of 5 stars (1,592)
Global Trade Identification Number	00079191220085
Included Components	Motor Oil
Item Type Name	Motor Oil
Liquid Volume	5 Quarts
Manufacturer	Castrol
Manufacturer Part Number	15E809
Manufacturer Warranty Description	12 months
Model Number	15E809
Size	5 Quarts
Unit Count	160.0 Fluid Ounces

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

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