A new intercooler would not cure an oil leak as only air should be running through it.
Any oil will be coming from a different problem.
Have you got anything in writing from them?
Are you in the AA/RAC if so you may be able to contact their Legal Department for advice.
Any oil will be coming from a different problem.
Have you got anything in writing from them?
Are you in the AA/RAC if so you may be able to contact their Legal Department for advice.