I buyed one of those "long time in garage" M3W and I checked just now my oil tank cap to avoid similar problems:

The cap looks different as I have an oil dipstick there:

https://drive.google.com/file/d/1BP6G1-ihT5WYDmGSxOtjB665G1sPARg6/view?usp=sharing

https://drive.google.com/file/d/1BIt_bjmC6cj4EZAb54Vj9LbGCAHGNGZ7/view?usp=sharing

...is this OK?

Eddy

built not bought - hustled not handed - earned not given - rare not average