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Old 07-02-2020, 10:48 AM   #1
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Class A Oil Change

My motorhome has been sitting for about a month. I need to change the oil. I know conventional wisdom is to fire it up, let it get to operating temperature and drain the old oil out of the crankcase.

I was wondering what good that does? Isn't all the oil that will drain out of the engine passages already in the pan from sitting for a month? Seems like all I'll do by starting it is to redistribute the old oil all through the engine.

Why not just drain it now without starting then let the drain pan sit under there for a couple days so all the old oil drips out?

Thoughts?
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Old 07-02-2020, 11:04 AM   #2
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I would just drain it, it may take longer do to being cold but you are right that all the oil is in the pan.
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Old 07-02-2020, 12:37 PM   #3
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I would just drain it, it may take longer do to being cold but you are right that all the oil is in the pan.
I agree.
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Old 07-02-2020, 05:55 PM   #4
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Warming it will dissolve any sludge in the pan and passages, which will then drain with the oil.
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Old 07-02-2020, 06:06 PM   #5
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Warming it will dissolve any sludge in the pan and passages, which will then drain with the oil.

I've heard this reasoning many times but I don't buy it. Any sludge was warm the last time the engine ran and it drained down into the oil fan when the engine was shut off.


The only reason I can think of for warming the engine might be to ease draining in very cold weather. Even then it would probably have to be well below freezing to have any notable effect. Especially with multi-viscosity oils (10W30 or 15W40, for example). They still flow well at low temperatures.
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Old 07-02-2020, 06:08 PM   #6
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Warming it will dissolve any sludge in the pan and passages, which will then drain with the oil.
Exactly, warm oil flows better
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Old 07-02-2020, 06:18 PM   #7
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I've always drained my oil cold. If you follow a proper maintenance schedule, there should be very little to no sludge. If you have a tendency to go way past the manufacturers recommended schedule then probably a good idea to warm it up first.
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Old 07-02-2020, 06:35 PM   #8
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You run it to wash the condensation and contamanints off the inside of the engine block.
Condensation can build up on the inside of any thing, surely you all have seen this.

The circulating oil will mix with the moisture and contamanints and bring them down to the oil pan.

It also thins the oil a bit so it flows out before the contamanints and moisture settles to the bottom.

What's the big deal with running the engine a few minutes. That way you know it runs before you screw with the fuel filters.

You don't need bring it up to operating temps, just get it warm.

PS: never let the engine sit empty of oil. In an emergancy, you want to be able to move it.
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Old 07-02-2020, 06:51 PM   #9
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I've changed my oil cold when it had been sitting, the only problem I ran into twice was I couldn't loosen the oil filter so had to warm it up to loosen the oil filter.

My procedure for draining oil is...first loosen the oil filter just a tad to make sure I can loosen it.

Then I drain the oil and change the filter.
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Old 07-02-2020, 06:51 PM   #10
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X2 on getting the oil warm before draining for all of the reasons that the other posters cited. You want all of the contamninants in the old oil be be in suspension and not stuck on interior surfaces of the engine as they will be and where they will stay when the engine is cold. So when the new oil is dumped into the engine, once started, those contaminants will then go into the fresh oil contaminating it. There can never be 100% fresh oil... some stuff will still be there, but a lot less than if cold oil.
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Old 07-02-2020, 07:22 PM   #11
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Warming it will dissolve any sludge in the pan and passages, which will then drain with the oil.
That was the common knowledge before detergent oil. If you do regular oil changes ,there won't be any sludge, besides, sludge isn't broken up by heat, it's created by it.
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Old 07-02-2020, 08:04 PM   #12
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The biggest reason for a hot engine (and I mean drive for 30 minutes) is to drive any moisture out of the engine, especially if it has been sitting for awhile.

Heat will not dissolve bad sludge.
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Old 07-03-2020, 05:39 AM   #13
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If heat drives out the moisture before changing the oil, wouldn't heat also drive out the moisture after changing the oil?

Also, I have a hard time believing there's much in the way of sludge in oil that's only been in there for a little over 3,000 miles. I think I'll drain it cold.
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Old 07-03-2020, 04:32 PM   #14
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cold,,,if ya got sludge ya got problems. you will get more oil out as its in the pan like said above..
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