My advice?

If you want any chance of goodwill, Dealer service.

If you feel competent and can safely get the spark plugs out and back in without cross threading, and you have somewhere to gain access to the sump plug... don't forget, if you "screw up" it's down to you.

Take your pick,

for me.dealer..

Totally disagree - save your money and service it yourself if you intend to keep it for any length of time. Record everything you do - that's the service history. The older the car gets, the less difference there will be between the values of your history and a dealer history. And don't waste money on air filters, the UK is not very dusty. I didn't even look at our Focus' pollen filter until we'd had the car for twelve years - it might even have been the sixteen year old original. I cleaned it with a stiff paint brush and a vacuum cleaner and replaced it. Same goes for the engine intake air filter, which I clean every 30,000 miles or so. The MoT test does all the checks and more than a garage would do during a 'service'. No point in paying twice. One tip - buy a cheap bendy-bar torque wrench for the plugs (spark/sump) and wheel bolts. You don't have to be accurate to a single footpound and you'll be surprised at how little force you need for the plugs. It can double as a breaker bar for too-tight wheel bolts.

And I have met wheel bolts which I doubt a simple torque wrench would have dealt with, I had to put a 2-foot bar on my socket wrench just to start them.

This is the simple torque wrench I have used for at least 40yrs. Nice to see on googling that they are still being made! No moving parts, so nothing to go wrong. No wheel bolt has ever defeated it.

www.drapertools.com/product/34487/1-2inch-Sq-Dr-0-...h