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post #1 of 6 (permalink) Old 05-19-2010, 09:54 PM Thread Starter
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I have a 81 GL1100 and I`ve been running 10W40, but I've noticed when the engine gets hot it sounds like a bag of marbles under the hood. If I went to a slightly heavier grade like a 15W40 would that help ? Also I have a gasket that needs replacing so I have a small oil leak, would there be a drop in oil pressure that may be causing this sound?

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post #2 of 6 (permalink) Old 05-19-2010, 10:49 PM
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When your oil is hot 10w40 and 15w40 wt oils are the same viscosity.You may want to try 20/50, the manual doesn't call for an oil that heavy, but lots of guys run it.I run Delvac 1300 15/40 diesel oil, and motor noise is next to nothing.,,

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post #3 of 6 (permalink) Old 05-19-2010, 11:05 PM
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What, you didn't know about the marbles Honda put in the GW motors?
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post #4 of 6 (permalink) Old 05-19-2010, 11:51 PM
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I used to use DELO400 15W40 in my 1100s just like I do now in my 1500. It's a fact that 1100s do have a good bit of mechanical noise when running. If the valves are properly adjusted and the carbs well sync'd that goes a long way toward quieting them down but they are never going to be silently running mills.

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post #5 of 6 (permalink) Old 05-20-2010, 12:43 AM
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Big Cahuna wrote:
.....You may want to try 20/50, the manual doesn't call for an oil that heavy, but lots of guys run it.....
Actually, the Honda Shop Manual does specify conditions in which 20/50 is acceptable. Page 3-15 of the newest version covering '80 thru '83.

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post #6 of 6 (permalink) Old 05-24-2010, 12:27 PM
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Thin oil makes the 4 cylinder engines sound like rattlers, more so in summer. I find 20w50 is better for summer or all year round, and lighter oil for the winter months.

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