Corvette Blowby

“A friend bought this 1991 Corvette recently. It’s only got 139,000 miles on it, but it obviously had a bad maintenance history. It was still running great though and had good power, but the engine blowby was very bad. The pressure in the crankcase was enough to blow the dipstick out and oil was literally pumping from the tube. We did a leak down test and every cylinder had 20% or more drop. I followed the directions for using the Flushing Oil Concentrate, the oil came out looking very brown for brand new oil. The blowby pressure reduced a significant amount, the dipstick didn’t budge at all, and when I take the dipstick out now, there’s only a small amount of pressure there. The amazing thing was I did another leak down test immediately after the flush, and now it’s around 10% – 12%. We’re going to get the FTC Decarbonizer in the gas tank now and expect to see the blowby decrease even further as the rings and cylinders clean up. Very happy with the result!”

Dave D, Belleville, MI