aljken Posted January 19, 2017 Share Posted January 19, 2017 Gear oil goes in transparent. you fly with it for just an hour or two, check it and it's already dark black. What's the black colour from? is it little bits of clutch, heat change with the oil, ground off bits of cogs? Quote Link to comment Share on other sites More sharing options...
calcifer Posted January 20, 2017 Share Posted January 20, 2017 are you talking about a paramotor engine gear oil ?? My paramotor gear box oil (gear reduction) does NOT turn dark black after two hours. It just darkens a little bit after several hours. Quote Link to comment Share on other sites More sharing options...
fuzzybabybunny Posted January 21, 2017 Share Posted January 21, 2017 (edited) Which engine do you have and oil? Edited January 21, 2017 by fuzzybabybunny Quote Link to comment Share on other sites More sharing options...
aljken Posted January 21, 2017 Author Share Posted January 21, 2017 Thor 130 (Polini). Oil is Elf Moto Gear oil 10W40 (2T) - you can see an example here https://www.amazon.co.uk/Elf-Moto-Gear-10W40-Litre/dp/B009PLX3AY I'm talking about the gear reduction oil. It's done this for about 3 years, perhaps it's just my engine? Does it mean anything? Quote Link to comment Share on other sites More sharing options...
morgy Posted January 21, 2017 Share Posted January 21, 2017 I would check your clutch... Is it slipping.. It will turn dark but only after a few hours... Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted January 21, 2017 Share Posted January 21, 2017 My this help Quote Link to comment Share on other sites More sharing options...
calcifer Posted January 23, 2017 Share Posted January 23, 2017 (edited) my engine's clutch is separated from the reduction gearbox (dry clutch), so this is the reason why my gear oils does not turn black. I don't know your one... but I think it's normal that when you have a wet clutch engine (running in oil bath) that the oil turns black in a short time by the clutch ferodo residuals. On the motorcycles that are equipped with a wet clutch it is normal that the oil darkens after a short use. It does not turn deep black like the engine one, but it darkens. Edited January 23, 2017 by calcifer Quote Link to comment Share on other sites More sharing options...
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