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Reviewed in the United States on February 26, 2025
I added it to my 1961 Corvette oil change.
Deanna Ladie
Reviewed in the United States on September 6, 2024
I used it with my recent oil change in my Chevelle and it seems to help the flat tappet lifters and I’ve noticed the car accelerates much better
JOHN W
Reviewed in the United States on September 27, 2024
Used it for a ticking noise with my Jeep. Added 1 full bottle for 6 quarts of oil. Within a half hour of driving, ticking went away. Flat tapped heads on my Jeep need Zinc. Impressed. Worth the money.
Au-Met
Reviewed in the United States on September 18, 2024
It will take time to possibly see results, but so far I have seen no damage as a result of the product
MrTom1
Reviewed in the United States on August 3, 2024
Made the engine quieter and gave me about 2 to 3 more mpg, Since the engine takes 10 quates of oil I use 2 bottles when I change the oil. This truck has only ever had Royal Purple oil 15/40 oil since it was new in 2005 and 75000 miles later still going strong.
chas
Reviewed in the United States on June 18, 2024
This is not something that is going to increase mileage or work miracles to extend oil changes by thousands of miles. It is simply an additive to add back luibicating properties to newer synthetic oils that were removed to placate the EPA nazis, no matter the harm to your engine. These materials are especially beneficial in the valve train and piston skirt areas that have a high metal to metal contact.
Dapper
Reviewed in the United States on December 12, 2024
Will purchase more, whenever needed.
Timothy Arbogast
Reviewed in the United States on October 25, 2024
Just bought the product so it's hard to evaluate it's effectiveness If it does as advertised I'll be satisfied Thanks
patrick h plemel
Reviewed in Canada on January 18, 2024
Required for flat tappet break in, or just for use on vintage engines
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