it is personal knowledge and some is information I have collected from other websites.
If you have anything to add, please let me know.
Smart state that more than 1 litre of oil loss over 1000 miles is excessive.
I'd have to agree, it's very excessive. If you experience half of that oil loss I'd recommend
getting the car looked at and possibly having the engine reconditioned. It's not going to fix itself.
Pistons And Cylinders
Valve Guides And Stem Seals
Faulty Breather Pipe
Warped Head Or Damaged Head Gasket
Worn Main Bearings
Leaking Turbo Seal