Stick to the original 50:1 plan. My reason is this. Your 20 something year old kicker with 20 something year old crank seals, that are most lickly dry & worn nead all the oil they can get to seal properly. If they leak your engine will be running lean possibly causing severe internal engine damage. Also while on the subject. Don.t cheap out on oil. Use only name brand,OMC, Merc,Suzuki or whatever. As far as aftermarket brands Esso is ok. All others will carbon the crap out of your motor severly redusing the hours remaining in it's life. Hope this is helpfull. Billy the boat mechanic.[8D]
I'm setting priorities & making time for fishing.