What engine oil do you use?

 i just did mine today with genuine mazda oil filter and 5/40 fully syn oil i also add wynns lifter treatment to a warm engine and never get hl clatter

Did you add it before oil change or after?

 

 i just let the engine warm up then add it as it says on the bottle

 

 Thanks - did you add it before the oil change or after?

i.e. - is it in the new oil, or did you use it as a flush?

 after the oil change just warm engine up with your fresh oil in it and then add it