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I'm betting the thinner oil is finding it easier to seep through various openings and has to be burned out on startup.
If it runs fine and doesn't foul the plugs I don't see a problem.
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Even though it is costly, replace the oil with the correct stuff, the 5w is lower viscosity cold and is getting past the rings/guides when the engine is first started. Causing a bit of unnecessary wear during startup as well.
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Oil is getting past the valve stems/seals.
5w or 10w won't make any difference.
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I think in a 30 year old engine, you're going to have to accept the fact that it is going to start smoking sometime and changing the oil won't fix it- it may possibly hide it if you're lucky.
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09-16-2016, 08:55 AM
(This post was last modified: 09-16-2016, 10:38 AM by fredhargis.)
No suggestions or opinion to offer, but I think it's great to have that still running (well, apparently) after 30 eyars. Honda makes good stuff!
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.