Quite possibly. Read on.Is it likely that I made a mistake after picking up the car/ made a bad purchase to begin with
No, not at all....is my mechanic the one likely at fault?
When you looked at the car to buy, did the engine make any rod noise? What did the oil look like when you pulled out the dip stick? What did the coolant look like?
If your mechanic had the car, wouldn't he say "there's an engine noise" if it had one?
Did the car sit without being run for a long time? Did you hammer on the car when you first got it on the highway?
Since the car has forklift damage, that tells me it has a very checkered past... When you looked at the car, how bad did that damage look? Usually, the only time a car gets moved with a fork lift is in a junk yard....
All that said, no one has a crystal ball... You bought the car and when you buy an old car, you have to do your due diligence when you inspect it. Perhaps having someone else more knowledgeable with you the next time might help.
Blaming someone that did some simple work isn't right.
IMHO, **** happens with old cars. It's 57 years old. Sometimes with warning and sometimes without. It's happened to most of us... All is good until there's a bang and a big puddle of oil and coolant.