Hope you've all been enjoying the sun .
I've had my E60 525i for about 11months now and have a problem with the oil level. The message 'oil level at minimum' keeps on coming up after I've taken it out for a spin. This happened the first time about 4 months ago. I took it to my local garage and they changed the oil level sensor, it worked fine for a month then the same message came up again? I looked under the car to see if there was any oil on the drive, but there was nothing there. I took it back to the garage again and they said it was the rocker cover gasket(which they changed). it was fine for another month and then the message came on again last week .
Does anybody know what the problem might be? I absolutely love the car but I'm close to selling it out of frustration .
Thanks in advance.