What spark plugs do you use?

[wileecoyote]

Every 3 years? I'm disappointed Ron. I pegged you as an every year replacement guy! Thats why I added the caveat for preventive maintenance artists such as yourself. :thumbsup:

Touche' Mark - HOWEVER, that would never happen to me b/c I replace them every 3 seasons. AND I put Never-seeze on the threads. But for the lazy and neglectful, you are correct!

My 99 cent Autolites from Wallyworld worked flawlessly - now I pay twice as much for my "marine" plugs b/c of that letter "M!"

 

[Captain Allen]

I use AC MR44T's. They are slightly hotter than the 43T's and my mechanic thinks they do better for the use I give my boat. (lots of slow cruises down river, etc. I tried Champion and they fouled in just few hours. Oh, and I have 1994 Merc 454 Bluewater engines.

 

[Knot It]

I was just thinking about my plugs as well. I have 2001 7.4 Horizons and from the merccruiser site here, http://www.mercurypartsexpress.com/us/parts-search.html#epc::mc6385007mr1368ar12395bi3937780
it recommends these:


SPARK PLUG, Platinum Tip (NGK BR6FVX) (454 MAG MPI HORIZON)

Contact your dealer directly if you require assistance. If you would like to purchase a service or owners manual, please go to https://mercnet.mercurymarine.com/litreq/

Is there a cheaper alternative that is an identical part from another manufacturer?

 

[rondds]

If your boat had OEM platinum tips, do you HAVE to use platinum tips to replace? Isn't the main difference how long they can go without changing? Educate me please. I almost welcome the copper replace interval gets me in the ER nosing around and I would imagine that if you pull plugs every 3 years they may be easier to get out than pulling them every 7+ years.

 

[matthewmiller01]

Going to perform a tuneup for the first time on this boat here in a few weeks. Does anyone use the E3 plugs? Thoughts?

 

[ardeprint]

Going to perform a tuneup for the first time on this boat here in a few weeks. Does anyone use the E3 plugs? Thoughts?

I would stay away from them. Those "to good to be true" products usually are just that. Stick to oem! A marine engine is not like an automotive one.