View Full Version : oil mix ratio on older mercury
05-08-2004, 10:19 AM
anyone know what the mix ratio is on an older Mercury 20hp electric start
serial # 5730301
05-08-2004, 07:06 PM
My 73 Merc. 10 hp. is 50-1. They have been that way for a long time. PM Lakeraider, he's our resident Merc. expert.
05-08-2004, 10:33 PM
The 7 digit serial numbers started in 1956, which would have been the Mark series. Being your motor is a 50-series serial# I'd say it is a very late 1978 or early 1979. That would make the mix 50:1 :cool: Raider<><>
05-08-2004, 11:57 PM
I might have missed on the year. It looks like a 1980-1985. After 1986 I beleave the motors started with the A9 seriaL #"S The mix is 50:1
05-09-2004, 12:38 AM
Thanks raider thats what i figured and i did believe it was a mid 80's just wanted to check with the resident expert on the merc's, she runs real good..
05-09-2004, 08:33 PM
Hey Raider. that what I thought also. I have that 73 also have an 85 in canada that uses 50-1. Darn I'm getting better with age.
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