What spark plugs are you using in your M113 engines? I have been on the NGK website and they have 2 options.....
Recommended - PFR5G-11
Upgrade - BKR5EIX-11
Not a lot of difference in price. This is for my 2004 R230 SL500.
Thanks
Recommended - PFR5G-11
Upgrade - BKR5EIX-11
Not a lot of difference in price. This is for my 2004 R230 SL500.
Thanks