Spark plug interval change
1. Are there two per bank? How many total?
2. Are these iridium tipped plugs?
3. MB technical or support - replacement brand w/ part #.
4. Should I replace the packs? If never been changed at 143k now, and what else should be looked into while doing this job if anything while I have it apart.
5. Brand recommend by MB NGK...??? Bosch....???
thx










