I'm expecting to become the owner of a diesel in the next couple of weeks and after only driving petrols, I'm concerned I'll end up putting in unleaded.

Do the current Octavias have any physical method to stop using the wrong fuel?

Or is it worth fitting an aftermarket device?

The Octavia is the first diesel I've owned with an anti miss fuelling device so I think you've in luck.... I think it's a miss fuelling device anyway...

Anti miss fuelling fitted as standard. 

Thanks saves me £39

I have been tempted to try sticking a petrol end in . . . . just seems wrong to attempt it.   Like trying to stick a USB into a firewire port . . . . 

You'll get used to it very quickly anyway. If you pick up the petrol one by accident you will notice how weedy and inadequate the nozzle looks by comparison.

I don't know I'm pretty weedy and inadequate myself.

How does the device work? easy enough to make  the tank filler small enough for a small nozzle thus preventing a larger nozzle from going in, but the petrol nozzle is the smaller one, so how to stop petrol going into a diesel tank?

 

I assume some sort of valve triggered by a large nozzle so that the small one cannot get in properly?

Basically a sort of flap that needs the bigger diesel nozzle to make completely around the outside before it will allow it further in to allow the fuel in.  I first experienced it on a Ford a couple of years ago - nozzle has to be inserted pretty straight (in terms of the required angle) but you soon get used to it.  The smaller petrol nozzle cant make the whole of the periphery, so won't open the flap.

Thanks saves me £39

Tank of petrol er I mean diesel right there 

Tank of petrol er I mean diesel right there 

Saves you a lot more as you don't have to get the tank drained and system flushed

Saves you a lot more as you don't have to get the tank drained and system flushed

Err I was quoting the price of the aftermarket solutions I'd thought of buying.

£39 wouldn't cover the cost of the fuel or draining and certainly not the cost of clearing up the damage (post my Basil Fawlty impression after discovering the error).