Same thing for my Merc 150EFI. Can get cheaper NGKs but they aren't resistor plugs and will mess up your electronics.
$18.00 a piece for spark plugs for my 2005 Optimax. After much, much searching I found them for $13.30 each. NGK IZFR5J. I never would have thought. Plus there are no cross for Champ or Bosch that I've found.
Mike
Same thing for my Merc 150EFI. Can get cheaper NGKs but they aren't resistor plugs and will mess up your electronics.
I had my local auto parts store order some. They were 6 something a piece, but I had to buy a box of eight. Might wanna check into that.
MEMBER CRAPPIE MAFIA
My Merc uses NGK - BPZ8HS-10. The non resistor version is a lot less.
I've always bought my plugs from Advance Auto or Auto Zone. The exact same plug except a whole lot cheaper.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va