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Old 09-07-2019, 04:30 PM
jyeh74 jyeh74 is offline
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Originally Posted by Autoputzer View Post
The sensors degrade over time. My two older BMW's both started giving false low warnings. The only way to really know how much oil you have (or had) is a dipstick or to catch the old oil during an oil change and measure it. The system also only has a resolution of 1/4 between MIN and MAX. So, 1/4 above MIN could mean anything from 3/8's to 1/8 above MIN.

At my last oil change, 5.5 years and 55k miles, the system said it was at MIN, but it really only lost about 850cc. I'm not going to add oil until I see the level on screen below MIN. Then, I'm only going to add a half-liter.

Turbochargers, especially old ones, can cause some oil loss.
I guess there's really no way to tell for sure unless I use a dipstick. Could be the sensor or could just be an old car. Define old though. My car took the 1 quart without overfilling. And the warning light went away after I added the 1 qt of Castrol.

Last edited by jyeh74; 09-07-2019 at 09:17 PM.
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