TTT I would like to know also. I have a '97 Evinrude 90 HP. I bought some 80-90 weight Penzoil synthetic stuff. I was waiting on a reply to go cats go before changing mine.
I use the Johnson Evinrude brand. Tommy @ Rockwall Marine sells it to me. He can tell you what type to get, if there is more than 1? He will also mail it to you if you don't want to make the drive.
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John 1998 Promaster 190V, Johnson 150