My sweet running 1996 Roadmaster with 230,000 miles on the odometer had started fouling spark plugs due to warn valve stem seals….one treatment with a quart of Lucas Stop Leak and has eliminated about 90% of fouling after running motor 1400 miles….I’m very happy with this product and will use it at every oil change from now on!…..It’s a lot cheaper and better than repairs or changing plugs every 1000 miles or so.

Comments are closed.