Logo

Decoding sparkplugs MFS30

merc200dalarna

Contributing Member
I'm back for the 'annual' visit.

Pulled the 3 sparkplugs for 3 new as part of 'pre season' oils and lube of the 2015 MFS 30 4-stroke european version

Cylinder 3 (lowest of cyl) had a 'gunky' sparkplug, perhaps one can make note of that for future?
Reason?

The motor runs fine, has no issues with zipping oil throughout the 100 hours between change
Top plug in picture
VeBr9rP

link: https://imgur.com/a/VeBr9rP
 
I would change at least the #3 spark plug, and then check it after say 10 hours or so. Might just have been a wee bit too much oil in the crankcase.
 
Yes, you are right, I was a smidge too high on oil. Thought it would even out as oil got into the filter.

Oil is changed, filter is changed, correct level of oil this year.
All 3 sparkplugs changed for good measure.

Thanks pvanv, 'mate'!
 
Back
Top