Also not sure where you are but also find an indie who really understands Alpinas such as BMR Permormance near Gatwick or CPC Amersham
This is good advice. My B5 was previously serviced by a main dealer. They fitted the incorrect oil filter on 3 separate occasions because they used the BMW VIN number. Not the Alpina VIN.
This eventually caused the supercharger to fail as it is feed oil directly from the engine.
I tried taking this up with them but just kept running my head against a wall.
‘Its a BMW 550 Sir, it says so on the VIN... We have fitted the correct oil filter as per manufacturer’
Dumb a$$es clearly couldn’t read.. there’s even a plaque on the undertray part that needs removing in order to get to the oil filter in the first place - that plaque specifically says this car requires an oil filter for the BMW N62, 4.4 engine.
I even took legal advice because the supercharger is £4500 from Sytner, a hefty price to pay for 3 incorrect oil filters..
BMW UK wriggled their way out of it because the 3 incorrect filters were fitted to the car during ownership by the previous keeper.
Do find a good independent Alpina specialist, you will find that even Sytner mechanics don’t know what they are looking it.