I checked my oil at an auto parts store today and it was low so I went in a purchased a bottle of the heavy duty oil stabilizer and added it right on the spot before traveling to work. I started my car and couldn't believe how quiet the engine was right away. The Z engine is a DOHC and makes a little more noise anyway, but this product worked great! I have 164,000 on the engine but it sounds and runs like new. The fuel treatment is awesome too! Great product, I am dropping the other brands and using Lucas additives exclusively. Thanks again!

Jeff Menke

Phoenix, AZ