can this additive do any harm to an engine when used
not needed unless you had head gasket leak/just regular oil changes will take care of the rest
okyour struts are badthis is a common problem with speed demons.slow down.you can loose Control and whip-out lift your hood and look to see if there is any wet(oil) showing on the shocksor the springs are bad lookingor push down on the hood of the car with the hood closed and see if your car bounces overand over.and overif it does this means the struts are badreplace them!!! good luck.
I have heard some guys say that it will mess up your oxygen sensors since all that gunk in the smoke and gunk goes all over the O2 sensors inside the exhaust.
