3.0 plugs

[Mule Laker]

Is there a known "best spark plug" for the 3 litre Mercruiser?

Is the NGK-BPR6EFS, box 3623 the standard? Any known issues or advantages with the Iridium UR6IX IX, box 7348?

 

[Alumarine]

My 1980'ish (566xxxx series) takes NGK BR6FS / 4323 @ .035? factory sticker says AC-R43T
Your's might be different depending on year/serial #.

 

[dannys2004glastron175mx]

what year is your 3.0 ?

 

[Bondo]

Ayuh,..... Fancy shamcy spark plugs separate you from yer money, yer motor don't care,...

The AC Delcos are an Alloy body, 'n don't rust nearly as quickly as some,...

 

[dannys2004glastron175mx]

AC Delco MR43LTS are marine grade plugs . $2 or $3 bucks each at your local auto parts store

 

[Fun Times]

Any advantages with the Iridium UR6IX IX, box 7348?

On your engine model, nope not really.

 

[airshot]

My boat is a 1983 and while it runs very well the compression is starting to get a bit on the low side so.......I used the A/C Delco plugs for a couple years without issue except for an occasional fouled plug, recommended to switch to the NGK plugs and have not had a fouled plug since. That was two seasons back so my boat will have NGK plugs this year. Just NO champions!!

 

[wrench 3]

Iridiam plugs were brought out to extent the life on automotive applications. Around here most marine plugs die from old age before they ware out.

 

[Bondo]

AC Delco MR43LTS are marine grade plugs . $2 or $3 bucks each at your local auto parts store

Ayuh,..... Only if Mule has a late model 3.0l that takes the much longer plugs,....

Otherwise, they oughta be MR43T,....

 

[Mule Laker]

what year is your 3.0 ?

2007




Thanks guys.