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Oil checking

  • goingbroke
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4 months 2 weeks ago #19848 by goingbroke
Oil checking was created by goingbroke
I am always wandering do you check oil hot or cold seems to make a difference when it is checked cold it's always low say mid stick hot it's over full which is it. Thanks

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4 months 2 weeks ago #19849 by Roger Lee
Replied by Roger Lee on topic Oil checking
Can the oil level be a bit different from a hot check vs a cold check? Yes, but should be close and within range on either.Most of the time the main difference for many owners is the amount of oil sitting in the bottom of the crankcase. This will change your level that you see. So checking the oil right after you land may have a bit of a difference vs an aircraft that is cold and sat for days or longer. Cold OAT and engine vs a hot one. Many think that because the oil level on the stick is down a quarter of the way that the engine was using oil. It just lied to them. They rarely ever use oil.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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4 months 2 weeks ago #19851 by Kevin Stewart
Replied by Kevin Stewart on topic Oil checking
Mine always reads more when hot compared to cold. I also find that when it is particularly hot it is difficult to read the level as the oil doesn't cling to the dip stick as nicely as it does when it is cold. I only check it before first flight of the day unless there is evidence of a leak after a flight.

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  • goingbroke
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4 months 2 weeks ago #19857 by goingbroke
Replied by goingbroke on topic Oil checking
So the consensus is check it cold and if it's in the level reading portion of the stick leave it alone if I fill mine to the top cold it will be half inch over full warm.

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  • Captfebarker@aol.com
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4 months 2 weeks ago #19862 by Captfebarker@aol.com
Replied by Captfebarker@aol.com on topic Oil checking
Preflight:
Check oil. MID level on stick seems standard.
BURPING
Rotate prop left slowly on compression stroke.
GURGLE
Recheck oil. MAX seems standard
These are my findings on a NEW 912 ULS (12/12/2017

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4 months 6 days ago #19962 by goingbroke
Replied by goingbroke on topic Oil checking
Thanks that's what I needed

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  • Bill Hertzel
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4 months 5 days ago - 4 months 4 days ago #19968 by Bill Hertzel
Replied by Bill Hertzel on topic Oil checking
Typical Motor Oil expands ~4% per 100°F.

As an example, that means that 4 Quarts of Oil would expand the equivalent of 5 ounces with a 100°F (70° to 170°) temperature rise.

The difference between the MIN and MAX marks on the Oil Dip Stick is 7.5 ounces.
The Nominal Oil Level is in the Upper half of the Dip Stick indicator range on a COLD engine.
A freshly Burped HOT Engine may indicate an over-full condition.
This would be Normal and is to be expected.
Last edit: 4 months 4 days ago by Bill Hertzel.

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4 months 4 days ago #19969 by RTX
Replied by RTX on topic Oil checking
Click on link to watch video on how to check your oil for the Rotax 4 stroke engine.

www.rotax-owner.com/en/videos-topmenu/ex...ns/36-exp-si-27-1997


Below is link to operators manual on how to check oil level and in attachment is the specific instructions out of the operators manual on oil level check.

www.rotax-owner.com/en/support-topmenu/e...s#912-series-engines

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