10w50 vs 15w50 - Page 2 - Ducati.ms - The Ultimate Ducati Forum
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post #11 of 13 (permalink) Old Feb 6th, 2018, 10:09 pm
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I standardized on Rotella synthetic years ago on all my bike but no longer. It is synthetic and MA (motorcycle) rated but otherwise it's mediocre oil according to this incredible research - https://540ratblog.wordpress.com/201...-test-ranking/ . I digested all that information and now use Mobil 0W40 in my bikes - wet clutch be damned. Mobil was designed for high revving, hot running European turbo engines. The evidence I can offer that Mobil protects well is that when Rotella got to full temp on my SV1000S I'd hear a bearing knock at idle. That's gone with the Mobil oil.

Final points:

1. A thinner oil is generally preferable provided you're getting adequate oil pressure. Flow is what's important.
2. Oil has evolved. Feel free to substitute 0W30 for 10W30, 0W40 for 15W40 etc., especially in colder climates.
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post #12 of 13 (permalink) Old Feb 7th, 2018, 6:08 pm
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Yep rat540 has some very good info.
I wouldn't go to low viscosity though, remember on a motorcycle the oil lubricates the gearbox too.
Gearboxes typically rely on splash feed lubrication rather than pressure feed. A thin oil can drip/fling off to easily. It's a balancing act between different needs. The manufacturers specs are best ,taken with your ambient temperature range.
But yes , you should go slightly thinner rather than thicker for improved oil flow and lower oil temperatures.
Keep in mind also that as a motor wears oil clearances increase and that the gearbox tends to chop up the oil molecule strands causing it to thin out during use.
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If you cant fix it with a hammer, its probably electrical.
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post #13 of 13 (permalink) Old Feb 7th, 2018, 6:13 pm
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On a similar vein, years ago my 2stroke yz250 had issues with notchy stiff gear changes once hot, admittedly I was running in the outback in temperature over 35deg C. I changed from the recommended auto trans fluid to 80w90 grade and it used to shift like butter.

If you cant fix it with a hammer, its probably electrical.
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