Hi My Mariner booklet which is for 2/4/5 hp models (My engine is No 052021)
states 25:1 for breaking engine in then 50:1 after break in. I can scan and
e-mail booklet to you if you wish.
Stan


"frederick" wrote in message
news:1121421973.915300@ftpsrv1...
Would anyone know the correct oil mixture for a Mariner 5hp 2 stroke.
Model number is 5M. Serial number 6E3 156*** indicates 1988 year of
manufacture (Japan).
Googling hasn't helped so far. Later models seem to use 50:1.

Thanks