Moving from 10W-40 to 20W-50 - Kawasaki KLR 650 Forum
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post #1 of 4 Old 06-17-2017, 03:05 PM Thread Starter
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Location: Panama City, Republic of Panama
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Moving from 10W-40 to 20W-50

Always looking for the best condition for my engine, and reading the opinions in the forum and the service manual I consider that I can and I have to change the engine oil specifications. By living in the tropics, temperatures never drop to 0 C and can rise to more than 40 degrees. I have been using the 10W-40 for adhering to the dealer's recommendation. I think they do it because it is what the owner's manual says and they do not want to be the ones who decide or recommend something else. The service manual has a graph for temperatures and viscosity of the engine oil. The 20W-50 is the most viscous and is located in the temperature range of my area.
What things can I expect or should I keep in mind when the engine works with the new viscocity.
I have no problems with oil consumption. Should I heat the engine longer? The average temperature in the mornings is 26 C. Will the engine operating temperature drop?
What do you think? Any recommendation.
Greetings.
Dicky

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post #2 of 4 Old 06-17-2017, 04:04 PM
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Dicky,
From about 1974 until about 1997 Kawasaki only sold a 20W50 engine oil for use in its 4 stroke motorcycle engines in the USA. Even tho many of its engine oil fill caps read "Use SAE 10W40".

So even tho I live in Wyoming USA and rode/ride in temps from +25f to +105f my 1987 KLR650 had a long steady history on 20W50. I switched over to the 10W40 for oil pressure testing and oil flow alterations in 2012.

Switch if you wish. Your engine won't care. You may or may not feel any difference in clutch engagement or shifting or fuel mileage at your ambient temps.
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post #3 of 4 Old 06-17-2017, 04:49 PM Thread Starter
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OK thanks. When I make the change I will pay attention to the operation of the clutch to see if I feel something different. Regards, Dicky

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post #4 of 4 Old 01-20-2018, 10:37 AM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
Dicky,
From about 1974 until about 1997 Kawasaki only sold a 20W50 engine oil for use in its 4 stroke motorcycle engines in the USA. Even tho many of its engine oil fill caps read "Use SAE 10W40".

So even tho I live in Wyoming USA and rode/ride in temps from +25f to +105f my 1987 KLR650 had a long steady history on 20W50. I switched over to the 10W40 for oil pressure testing and oil flow alterations in 2012.

Switch if you wish. Your engine won't care. You may or may not feel any difference in clutch engagement or shifting or fuel mileage at your ambient temps.
After changing the oil from SAE10-40 to SAE 20-50 in September and taking note of the fuel consumption, before and after, I can say that I have not noticed any difference in consumption. The same happens with the operation of the clutch. Nor any difference with the operating temperatures

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