40mm should be ok over all but the worst bumps but yeah, better to be safe! Did you order normal Cupra top mounts or the Cupra R ones? The standards might not last so long when lowered.
When are you joining the petrol side then mate?
Haha not until I get an S4 or Mk1/2 Golf GTi, I like the Leon as it is and like surprising people with the diesel
Id suggest going for spacers first cos they raise the sump above the subframe. The shallow sump doesnt have an oil lvl sensor so that would bring up a light and need to be mapped out
Diesels don't have the oil level sensor in the sump, thats only on the petrol models as far as I'm aware. I have the shallow sump on my FR and didn't have any problems with lights on.
The ARL engine doesn't have the level sensor in the sump in the Leon so you don't have to worry.
In golfs and passats etc it does but not in ours