Requiring 1L engine oil top up every 800km / 6 weeks - help

[imported_danielt]

Hi, I've got a 2013 F10 M5 LCI. It's done 75,000km. I've been needing to top up 1L engine oil every 800km or 6 weeks (it doesn't do many KM). I took it to an independent BMW mechanic back in early September (6 weeks ago) who did the following:

inspected Vehicle for Oil Consumption To High -No Major Oil Leaks
Oil Weep Around Bottom Of Sump - not the cause of High Oil Usage
Checked PCV Valve, Removed Spark Plugs for Inspection all ok
Refitted Spark Plugs
Carried Out Compression Test -Recommend Oil Flush
Carried Out Engine OiI Flush -Drained Engine Oil and Refilled

Problem not fixed. Anyone else had issues with regular oil top ups? Might have to go to the dealership next, but an idea of what the issue is might be helpful. Thanks!

[M5Rick]

What oil and grade do you use.

[imported_danielt]

The mechanic used Liquimoly Toptec 4200 5w-30. I'm in Australia and the temps here are summer - 30-35 degrees celcius, and winter, 5-10 degrees celcius.


The few times I've topped up I've been using Penrite full synthetic 5w-30

There's no oil leaking on the garage floor etc.

[M5Rick]

Originally Posted by imported_danielt

The mechanic used Liquimoly Toptec 4200 5w-30. I'm in Australia and the temps here are summer - 30-35 degrees celcius, and winter, 5-10 degrees celcius.


The few times I've topped up I've been using Penrite full synthetic 5w-30

There's no oil leaking on the garage floor etc.

5W-30.
I wouldn't leave it to a mechanic to decide what oil to put in, it used to be used by BMW own name oil here but now it's changed to 0W-40 for better temp range viscosity.
I personally use Edge 0W-40 and I give a quantity amounting to 9.5 litres to my BMW service agent to refill with and it's actually written on the oil cap of mine only to use Castrol.
As far as top ups it's easy at once a year, so actually when a year is up it goes in with the top up warning flashing up around then.