[recycled sixtie]

He should have got a PPI before committing to it. Although I know stuff can go wrong after a sale especially with folks who are not technically minded and screw up.

Trusting you sold the car "as is" on the bill of sale. I think that you have to move on and say I cannot help you anymore. You have demonstrated that you have been good to him over the years in fixing his cars. You did not I imagine imply any warranty on this car so all fixes must be paid by him. You cannot win them all. Move on....