Hi i was wondering if anyone could solve my problem ....

i have a 1989 honda civic with 150 000 km and it is burning oil like
crazy 4 litres a week i think. When i floor the gas there is a cloud
of grey smoke, but not all the time?.......

would it be the PCV valve thing?? what does it look like?

or is it something more severe?

Thanks for your time.