I recently was given(as in free) a 2002 Blazer with 106K miles on it.
It ran just fine but anyway I ran 2 bottles of Techron and now am running some MMO.
I figured what the heck cant hurt.
And the Blazer was in the same family since new and the plugs are original.
They are very hard to change and at my age no way I'm doing it.
Local shop wants $335 to do it.
Anyone in the Denver,Co area want to do it a little cheaper?