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YOUR RESEARCHDo you change your engine oil hot or cold?
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last time you shut down the engine, at
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If you change it when cold, this isn't the case - but it was the last time you shut down the engine, at which time all that hot oil dripped down into the oil pan.
Leading evidence: 'last time you shut down the engine, at' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'last time you shut down the engine, at' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace engine oil hot or cold' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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If you change your oil when hot, it has a nice low viscosity, so a high percentage of it readily flows out of the engine and into your collection pan (provided you're willing to wait about 10 minutes for the last drips to fall).
Replace oil 3x more than the factory recommends anyway
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Suggestion
We enthusiast typically change the oil 3x more than the factory recommends anyway.
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Suggestion
I had a block heater installed so I could change the oil hot without actually having to risk starting the 996.
If you change your oil when hot, it has a nice low viscosity, so a high percentage of it readily flows out of the engine and into your collection pan (provided you're willing to wait about 10 minutes for the last drips to fall).
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Suggestion
Suspended particles and debris (plastic cam tensionor debris/guide wear materiel/dirt/etc) will stay suspended briefly after engine has been run/driven hard.
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Suggestion
If you do plan to do an analysis, you need to run engine at operating temp for a good 30 minutes so as to burn out any moisture or fuel within the oil that may of seeped in if parked for awhile.
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last time you shut down the engine, at
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Suspected cause
If you change it when cold, this isn't the case - but it was the last time you shut down the engine, at which time all that hot oil dripped down into the oil pan.
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The hotter the better, you are trying to get rid of all the old oil. The hotter it is more will drain out. I drive the car till it is at operating temp (180) then park & drain A.S.A.P
My theory is that it doesn't matter much:
If you change your oil when hot, it has a nice low viscosity, so a high percentage of it readily flows out of the engine and into your collection pan (provided you're willing to wait about 10 minutes for the last drips to fall).
If you change it when cold, this isn't the case - but it was the last time you shut down the engine, at which time all that hot oil dripped down into the oil pan. And now a high percentage of it flows into your collection pan (again, allow ~10 minutes).
In either case, most of the old oil comes out. And since you didn't wait until the old oil was completely worthless, the fact that only about 99.4% is easily removed does not lead to any problem once the new oil is installed.
I have done it both ways, and absolutely does not matter at all. You change the oil, that is what's important. Life it too short to worry about its temperature. We enthusiast typically change the oil 3x more than the factory recommends anyway.
Hot in general. I usually let the car drain for a couple of hours as well. It's incredibly convenient when you have a lift at home to keep the car on while you wait.
I totally agree with this. Typically I let the car sit overnight and do an oil change in the morning. That way most all the oil has drained back into the sump overnight and I just let it drain until no more drips are coming out. All in all, it comes out to about a 2 beer job. I also "finger my sump" to feel for any loose bits, but have never found anything.
I know you are just kidding, but I thought about a statement Jake once made - you can actually run the engine without the drain plug in and no oil will come out, same goes for a hole in the sump plate. So the idea of Man's man - hot, engine running may not work out so well. Just saying........
I always do it hot since I always take a sample to send off the Blackstone. If you do plan to do an analysis, you need to run engine at operating temp for a good 30 minutes so as to burn out any moisture or fuel within the oil that may of seeped in if parked for awhile.
I let it idle for 5 minutes then change the oil. Don't want it so hot it burns me, but want it to flow well. Pull drain then make sure most comes out and doesn't overflow, then have a nice beer while it drains, then change it and button it up.
Dealer just did my 997
Started it, drove 100ft onto lift
Shut off
Drained old
When I asked the tech why he didnt warm it up more he laughed
He added that true, if car has sat with old dirty oil then maybe hotter is better.
It seemed more of appeasement than agreement.
I let mine idle till it started to warm, then I pull the plug and leave it till morning.. I figure if your supposed to check the oil cold in the AM, letting it drain till the AM optimists it all draining out, fwiw I let it drain marked where it was in the pan by morning it has about 1 more quart.
Totally scientific with graphs and everything... ok well not so much LOL
The link posted above about hot oil has many misconceptions/errors. I'd disregard that link altogether imo.
I mean who adds oil while engine is running...? lol
Quote from total BS article link...
"What happens if you add oil while the engine is still hot?
Adding oil to a hot engine can be dangerous. It causes the oil to become too thin and not provide the necessary lubrication your engine needs. If you
add oil when the engine is running
or still hot, there is an increased risk of vapor lock or oil aeration, leading to a loss of power in your vehicle’s engine."
There is something to be said for hot oil drains, if tech is skilled enough to know how to safely handle a hot engine/oil.
Suspended particles and debris (plastic cam tensionor debris/guide wear materiel/dirt/etc) will stay suspended briefly after engine has been run/driven hard. Draining needs to be done quickly after engine shut down, while particles are still suspended, before they settle to bottom of sump floor where its harder to all flow out when draining cold oil.
After draining you can take your time and let it sit on the lift as long as you want. But no matter what you do, some old oil will stay in the engine. My guess is over a quart will never drain out and will dilute the new oil no matter what we do. Good reason to never let the old oil get 'nasty old, and keep up on regular oil changes sooner than latter...
Bottom line, other than maybe a more complete oil change, and in less time, hot vs cold will make not much difference. Except to the **** Porsche car owners like me... To most professionals working on the clock, they can hardly wait to get that drain plug back in and fill it up and get it off the lift to get to the next cu$tomer....
jmo
You mean the 19 year old kid they have doing the oil changes at most dealers?? LOLOLO Yea maybe not a Porsche dealer... I hold much bitterness with dealers from past experiences..
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