Mike
Ranger Z520
Mercury 250 Pro XS
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
I have never changed mine so I don't know what's in it. It runs great so I ain't messing with it. But, I have used lots of sierra parts and never had a problem. Like I said before a cheaper option but, not for everybody. My Pro XS is on a Allison so you can bet it gets run! Leaking thermostats and all