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Oil content

Old 06-08-2016, 08:38 AM
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1QwkSport2.5r
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Default Oil content

Why does OS list (in the owners manual) a required minimum oil content in some RC car engines (mostly old and discontinued engines) of 18% and almost all other modern engines makes NO reference to oil content of the fuel? What is the required minimum oil content for OS RC car engines?
Old 06-09-2016, 08:30 AM
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Bax
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O.S. makes the statement so that you can get the best longevity out of their engines. As such, they usually recommend no less than 18% oil content by volume in their two-stroke engines.

For their car engines, it's the same, except for racing engines. Since those engines have no warranty, you can do what you want. "Car" fuels usually have lower oil content to enhance engine handling, but they do not offer the protection against lean running that higher-oil fuels can do.
Old 06-09-2016, 11:15 AM
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1QwkSport2.5r
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Originally Posted by Bax
O.S. makes the statement so that you can get the best longevity out of their engines. As such, they usually recommend no less than 18% oil content by volume in their two-stroke engines.

For their car engines, it's the same, except for racing engines. Since those engines have no warranty, you can do what you want. "Car" fuels usually have lower oil content to enhance engine handling, but they do not offer the protection against lean running that higher-oil fuels can do.
I find that to be a bit far fetched since no other engine manufacturer of RC car engines has such a requirement for their engines. A lean run is a lean run - no amount of oil is going to save it if it's run that lean.

Oh well - it's good to be informed anyway.

Thanks.

Last edited by 1QwkSport2.5r; 06-09-2016 at 11:23 AM.

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