Questions tagged [oil-viscosity]

The viscosity of oil is the measure of its resistance to flow.

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Oil Change in new car

My New car says it takes 5w-20 and I just accidentally put 5w-30 in my car... now I'm worried. I heard that 5w-0 is used in the winter because it has a lower viscosity which allows the fluid to move ...
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Why don`t we use extremely thin oils in engines

I understand that lower viscosity oils are way easier to pump and move around engine parts, also they form a thinner "film" on friction surfaces which could improve parts measurements precision etc. ...
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Mixing oils of different viscosity

Hi everybody i am asking this question mostly in the context of motorcycle engine but i think the same basic principles apply on a car engine as well. I have changed my motorcycle engine oil with ~...
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1answer
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Does having no oil/thinner oil make an engine feel more revvy/lively?

I saw a comment which said if you run with no oil this would make a car sound and feel more revy and lively etc(though it wouldn't last very long). Is this true? Personally when I've been low on oil ...
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1answer
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Do oil grades for car change when they become older? [duplicate]

Car is a civic vti 1999. I've asked on forums and honda themselves who said so long as my weather isn't extreme one way or another, I should use 0w30 or 5w30 engine oil. When I went to pickup the ...
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Is it beneficial to run high viscosity oil in an old engine near the end of its useful life?

I have often heard that high viscosity oil (higher than what the manufacturer recommends) is good for old engines, engines that are nearing the end of useful life. So, for example let's consider a ...
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1answer
35 views

To change viscocity or not

I recently made a post about switching to synthetic, but looking at the answers and information all around i decided that it was not worth it for me. I have an 115.000 kms (70k miles more or less) 10 ...
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1answer
1k views

Engine warm up before oil change

It is advised to warm up the engine before oil change to ease up the oil drain. For a multi grade oil say 10W-30 at cold temperature the viscosity is 10(thinner) and if the engine warms up the ...
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1answer
393 views

Engine oil requirements

I ride a 2015 Yamaha FZ-07 (around San Francisco / Bay Area), which is water-cooled and supports 10w30, 10w40, 10w50, and 20w50 motorcycle oils. However, the manual says not use 10w30 oil when the ...
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205 views

Oil evaporates/burns-off (becomes thicker), should top-up be thinner?

I read somewhere that when the oil evaporates, the leftover oil is effectively thicker, e.g., to extrapolate, 5W40 may be closer to 5W50 after the evaporation takes place than before so. I use ...