2007-07-17 01:12:57 · 4 answers · asked by jfpsalad28 1 in Cars & Transportation ➔ Boats & Boating
The 10hp Sportwins were built in one form or another up into the early 1960s and don't make the cut for 50:1 mix. They still had several bronze babbit bearings and need some extra oil to stay in operation over the long haul. 40:1 using good quality TCW-3 rated oil and good quality gasoline (89 should be good enough - 87 can be kinda junky in some areas, 90+ high test not necessary) and you'll be good to go.
2007-07-17 01:42:23 · answer #1 · answered by Whoda thunkit? 5 · 0⤊ 1⤋
Yes fifty to one is correct, any two cycle motor oil will work. Outboard oil is packaged with a dye to indicate that the gasoline has the oil in it. I've used a Bel Ray,non dyed, 2 cycle motor oil for years without ever fouling a spark plug. The BIA endorsement is a rip off, most of the BIA oils are low in performance with low film strength, and poor burn quality, making plug fouling a common occurrence
2016-05-20 00:27:32 · answer #2 · answered by ? 3 · 0⤊ 0⤋
in the early eighties omc sent out a service bulletin on this as the question flooded the customer service line. it IS acceptable to and ok and Recommended that a good quality 50:1 oil be used in this motor. yes this motor as well as some up to the late 70"s has bronze type bearings. the 50:1 oil will work great. use the 50:1 ratio. I have used it in my older engines for 25+ years and they still run great. OMC asked people with the larger (v4's) or engines with lots of time to pull the cyl heads and cleanout any excess carbon, to prevent it from sluffing of with the cleaner oil. P.S. use a quality oil(an engine manufacturer's brand) and non alcohol fuel. good boating!
2007-07-17 03:33:48 · answer #3 · answered by gmc 4 · 0⤊ 1⤋
40=1 any nondetergent oil will work.don't know about the new tcw3 m
2007-07-17 06:28:17 · answer #4 · answered by 45 auto 7 · 1⤊ 0⤋