however he was very unhappy with the price and refused to pay for what he considered to be unnessesary work
D*ckhead.
For me, any apparent issue with the ignition, oil or fuel system is an absolute no-go item.
That said, I have installed a backup oil pressure gauge because the Socata one has a bit of a "history".
It does amaze me how many people turn up in say a nice new Porsche or a Merc and climb into some right piece of wreckage. It's a weird psychology...