Oil Change, Hot or Cold - Kawasaki KLR 650 Forum
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post #1 of 21 Old 09-02-2012, 09:01 PM Thread Starter
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Oil Change, Hot or Cold

I've always wondered:
Why should I worry about having a hot eng. and then let it cool before changing my oil?
Vs:
A normal ride day then let it set overnight and drain to the sump?
Other than a little longer time required for the oil drain to a drip pan, whats the difference if any?
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post #2 of 21 Old 09-02-2012, 09:04 PM
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warm oil flows better = more complete drain.
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post #3 of 21 Old 09-02-2012, 09:13 PM Thread Starter
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During an 80* day does that really matter, it is plenty hot when I park the day before?
Of course I have never split a case to see what is actually in there to restrict the oil from draining out of the sump.
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post #4 of 21 Old 09-02-2012, 09:19 PM
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If you don't change your oil when it's hot, you deprive yourself of the experience of burning your fingers with a hot drain plug and dropping it into your drain pan from which you later have to fish it out of the hot oil, again burning your fingers.



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post #5 of 21 Old 09-02-2012, 09:22 PM Thread Starter
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I can miss that one, I just thought why not try something different.
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post #6 of 21 Old 09-02-2012, 09:40 PM
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By changing hot, oil will come out faster (as previously stated) flushing out more solids that are in crankcase instead of them settling after it cools off. Also what planalp said. LOL
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post #7 of 21 Old 09-03-2012, 08:20 AM
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I've always done hot, up until recently. I find that I actually get more oil out of the bikes when I drain it cold, and the oil seems to stay cleaner, longer after a cold oil change.

Practical reasoning says it should be best to change it hot while any particulates are still in suspension in the oil.
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post #8 of 21 Old 09-03-2012, 09:51 AM
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I've been changing oil for almost 50 years...I have concluded that working on a cold engine, whatever the task, is preferable to working on a hot engine.

Common sense aside, I'd be curious to know of any scientific studies showing to what degree, if any, changing the oil on a hot engine actually prolongs its life. I'm sure it's more efficient at draining, but I am unconvinced that it offers a tangibile benefit to most of us bike owners.
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post #9 of 21 Old 09-03-2012, 10:11 AM
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With my last two changes, I just fire it up in the driveway and let it run for about five minutes until it's "warm" but not "hot," but I really don't think it matters that much. Even if I change my oil piping hot right after a long ride and let it drain for half an hour until absolutely no more oil drips out, as soon as I put the new oil (and filter) in it, start it and ride five miles, the oil in the sight glass looks just like it did before I changed it, anyway.

I may be wrong, but doubt an engine that's always been drained hot will last any longer than one that's always been drained cold. I agree with clogan.



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post #10 of 21 Old 09-03-2012, 11:42 AM
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Quote:
Originally Posted by planalp View Post
With my last two changes, I just fire it up in the driveway and let it run for about five minutes until it's "warm" but not "hot," but I really don't think it matters that much. Even if I change my oil piping hot right after a long ride and let it drain for half an hour until absolutely no more oil drips out, as soon as I put the new oil (and filter) in it, start it and ride five miles, the oil in the sight glass looks just like it did before I changed it, anyway.

I may be wrong, but doubt an engine that's always been drained hot will last any longer than one that's always been drained cold. I agree with clogan.

I do the same, start the bike and let it warm up for about 5 minutes. My theory is that the contaminants are suspended in the oil and more likely to get drained out. I don't think that the warm oil drains that much faster then cold at reasonable ambient vs. viscosity ratios from my unscientific observations!

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