The thing about mine was that the garage (and I use the term loosely) put crap plugs in at 36,000 without even asking. They put some Bosch wipers on too but that's another story
Actually the gang that did my job are taking out some poplars for a colleague ... had to get the leader of the council involved for permission from the planners ... I love trees but I really don't see the value of poplars
Update
The tree's been taken out today; I've not seen it but it must have gone OK otherwise the contractor would've phoned me. The roots are left in but the tree will be poisoned to prevent regrowth.
We know you're not thick Annie ... engines are indeed getting smaller but they are being force fed oxygen via supercharging or turbo-charging ... this makes it easier to design them to be more efficient AFAIK