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post #25 of Old 08-04-2013
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Re: Confused about which oil weight to use

I second the high rev comment. 3600 is pushing it. Actually on most long stroke engines its starting into the "screaming" definition. You may be a little underpropped too, but just pull the throttle back off 100% to the 85 or 90% level... you engine will love you for it. 100% of capacity work on any design is hard on em.

Its not quite screaming on many of the more modern designs with square or under-square designs in light duty applications... which could be why it may not have triggered a mental alarm to you. But its definitely pushing the upper end limits on long stroke old school designs.

1980 Seafarer Swiftsure 30
1978 Bayliner Buccaneer 270 (now sold and being restored in FL)
1962 SeaMac 14' Plywood Runabout, mahogany decked, with 1959 Evinrude 35 Big Twin (owned since age 17, I'm now 60)

Last edited by dem45133; 08-04-2013 at 09:02 AM.
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