Trout Hunter
Member
- Joined
- Jul 25, 2008
- Messages
- 19
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I have an older (1980?) mercury 20 horse. My buddy told me to use 89 octane instead of 87..... Says, "them old motors run better on higher octane". Is he right? I have heard to never do that in cars that don't specifically call for it so I am a bit leery. Thanks!