If it's a modern petrol engine, then it'll be all up to temperature after about 3 miles. So no issues regards condensation in engine or exhaust, fuel in the bores, or anything else, and it'll be fine.

If a modern diesel engine, then it's probably just getting to 'proper' operating temperature when she parks up. So the DPF will end up getting clogged (they only really work best when up to temp), the EGR valve would be collecting carbon far more (due to low engine temp), and eventually big bills will b on the way.

The real problem short journeys (for petrol engine cars) are those of 2 miles or less, regularly. There have been plenty of instances I've seen on here with elderly people with 2 year old cars with 4k miles on the clock, just used for driving very short trips 3-4 times a week, and the cars suffering major problems.

As for diesel, there was one case a couple of years ago when the (elderly) owner had driven 1200 miles in their new diesel car (a Corsa, I believe) in 10 months, and the DPF was completely clogged up.

I'd say that's no problem. The first 1.5 miles should get the engine up to normal operating temperature and then the 5 mile (blast?) should clear everything out.

Not a diesel is it?

edit: Just seen RobJP's post.

Edited by bathtub tom on 26/06/2016 at 00:17