I've used it before on a couple vehicles with great success. I decided to put it in the wife's tires in her Yukon. I took off about about an ounce and a half of lead weights on three of the tires and about three and a half ounces on the fourth one. Anyway, I put the four ounce packets in and its all good except a shimmy around 70-80 MPH. I'm thinking that that one tire might need a little more equal in it since I took off more lead (and I rotated the tire from the rear to the front, which I think it could more noticeable). So, my question...is it worth a try to add more equal to the one tire?