In article , Dave Plowman (News) wrote:
I wasn't talking about diesel engines. Why would I when the thread isn't
about them? 'IC' refers to internal combustion which covers petrol and
diesel types as well as those running on alternative fuels like LPG and so
on.

Though the thread did start with a link to
http://www.ibtimes.co.uk/audi-create...-water-1498524
which is specifically about diesel.