HI All, went to do a plug change tonight. All 8 plugs have heavy carbon buildup. Also all 8 plugs have either Gas or oil on all the threads (I can't tell which it is). It smells like gas but when I rub it off with my fingers it is very sticky like tar....How do I tell if it is gas or oil?
If it is oil why would all 8 plugs be covered with it? The motor is a zz4 with less than 2K miles.