Thread: Adding Oil
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      09-05-2010, 09:10 AM   #5
Technic
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Drives: 2021 i3S, 2024 i4 M50
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Quote:
Originally Posted by elp_jc View Post
It's not, but you need to know what you're doing. Plenty of reading material. When you get the 'Add +1L or risk engine damage', you can add that safely. With anything in-between, you have to understand how the sensor works. Basically you can be anywhere from 1/4 to 3/4L low on oil, but if you just noticed the level going down, 1/4L will bring it to FULL again. Therefore, NEVER add more than 1/4L at a time. Learn how to properly measure oil level and go from there. It's too long to type the details again (search), but always use same flat surface (garage), car fully hot (10-15 miles of driving), engine idling, and do a manual reset. Do this on 2 separate occasions before adding anything, just to make sure your sensor is being consistent. Good luck.
I would say more accurately that always add 1/4L at a time until the level is OK regardless of the ECU prompt.

I had that message and filling that 1L then created the "overfill" prompt.
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