My 1991 MB 300d had a large coolant leak from the head gasket. At 30 years and almost 400,000 on the clock the car just wasn't worth the time/cost of replacing the head gasket so I threw the dice at these tabs to prevent leaks. saints. Shit. IT WORKS OUT! I used to lose about a half gallon of coolant every 10 miles (did I mention the leak was BAD?). After using the product as directed, the leakage stopped. I am shocked. Aside from being really impressed with the performance, I also appreciate that (unlike some competing products) I didn't have to flush the cooling system or anything. I don't know how long this "fix" will last, but for $7, I can afford to keep this car on the road a little longer, so I'm VERY happy. Would buy again!
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