What to do about a loud cold start knock?
What to do about a loud cold start knock? Running SeaFoam through the oil 50-110 miles before and oil change cleans out the oil and really helps to stop the tick/knock. My 96 had this last month and the tick would last about a min and then stop. All vehicles with Hydraulic lifters can have this happen. What was the loud cold start knock that went away? A few months ago my nephew went to a quick oil change place and they talked him into a "engine cleaning". They added it to his oil, ran it for 15 minutes, drained...