Anyone ever owned/messed with one of these?

Friend of mine has asked me to give him a hand servicing it, as he's not too into that kind of things. Was just wondering if any special tools are required for changing the oil filter cartridge? Or perhaps if the sump plug has an odd fitting or something.

Never even seen under the bonnet of one, so don't want to try and start and then realise you need a funky spanner to get at the oil filter or something!

Ta