Oil change, HOT or COLD? - Page 4 - MVAgusta.net
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post #31 of 36 (permalink) Old 06-17-2019, 04:16 PM
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Honestly among aircraft mechanics optional preoilers are debated (I ride with two and they are even more anal than I about their bikes). But even then, not relevant. As long as there is oil in the sump the pickup works the same. Whether its been sitting there 30 minutes or 8 hours. Starting a cold bike after an oil change is no different than starting a cold bike in the morning. Sump->pump->filter->engine. Every time you start that bike after a few hours rest its relying on the oils adhesion for lubrication for the first 3 seconds until the pump pressurizes the system, regardless of whether or not its after an oil change or not.

And if adhesion isnt failing you after putting the bike in storage for a winter how is it going to be a problem after a 30 minute oil change (plus however long its been since you last fired the bike up)?

And so back to my engineers response: "Depends, but it doesn't matter." In a NORMAL circumstance there is no difference regarding metal shavings/carbon/whatever because those would have been captured the last time you ran the bike. So its just viscosity, which can be marginally different. So the only thing you're impacting is a small change in how quickly the oil may flow from the pan.

My response is: if that is all it is then dont stress either way. But if youd rather not burn your hands do it cold and go have a beer. You're not going to hurt your bike.

As far as your bike example though it doesn't really relate. Hot or cold starting a bike of unknown origin and questionable maintenance is going to be risky. Hell even if we are talking about the 4l engine out of TJ Wrangler Im still going to drop the oil and pull the VC off to see whats inside before I ever crank it up if the PO doesn't have a history on it. Im pretty sure most people on here (and the service manual from MV) is assuming normal conditions and regular maintenance.

Quote:
Originally Posted by silentservice703 View Post
You know I love a good discussion...I don't like being goaded.
Aren't you a grown man with agency who is in control of his thoughts and feelings? You can do like you did and just post a shot from the manual, continue to discuss or even just straight ignore. They are viable options for all of us.

Even if the OP is gone I just do what I do, which is post some information. For those who might run into this and wonder. And my only point is: It doesnt really matter, just change your oil and filter. Hell even the guys on the car building forums are so anal that they are sending their changes to blackstone to show that were changing our oil way too often. 8000 mile changes on turbocharged cars in Florida are still meeting SN specifications, the particulars of our 6000mi* change interval on well-cared-for bikes arent gonna make enough of a difference to get burnt over for me.

*with the caveat my F4 never makes it to 6000 miles between changes anymore. I do it annually instead. Just make sure that EVERY TIME you fire it up before storing it again it gets up to operating temps for a period of time.


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post #32 of 36 (permalink) Old 06-17-2019, 04:19 PM
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Agreed, Ryan...and you know that.

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post #33 of 36 (permalink) Old 06-17-2019, 04:34 PM
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I think that in the early days of aviation they preoiled as there was no sump !

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post #34 of 36 (permalink) Old 06-18-2019, 02:56 PM
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I love it when the Elders come out to shed opinion and light.
Sounds to me like you can do it hot or cold, whatever suits you at the time. The main thing is make sure you do it. Feels better to me to still get the bike warm though before draining...just my preference.


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post #35 of 36 (permalink) Old 06-18-2019, 03:02 PM
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Quote:
Originally Posted by AusMV312 View Post
Any opinions on this?.......
Yes: it should be a separate thread.

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post #36 of 36 (permalink) Old 06-18-2019, 03:10 PM
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Apologies, will do


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