Before putting sea foam in the engine I had a rather long talk with the tech from sea foam He said that 1.5 ounces per quart of oil and to run it all the time. It cleans the varnish formed by the heat and oil, it absorbs condensation, and will retain the impurities it captures so at the next oil change it removes it as the oil comes out. I also put a can in the gas once a month as directed to clean the injectors. The ticking is the injectors Thanks.