What Car? Q&A - Introduction

The What Car? Q&A mailbag has been crammed full of your queries again this week – what's the difference between different horsepower classifications, what's the quietest estate, does a manual Mercedes hold onto its value more than an automatic version, and is there a way to track down a car’s service history are just some of the queries you've sent us this week.

Click here to submit your own question to the Q&A team. We publish a selection of your questions – along with our answers – here every week.

Don't forget you can also turn to the What Car? Helpdesk with motoring problems or disputes you might be having. Click here to e-mail the Helpdesk.