I bought a car which has 110k.

Basically, it is missing lots of parts such as turbo, DP, exaust manifold, intake, etc...

So I don't know engine is good or not.

But the seller told it runs before he took those parts.

beside, he said newly built motor has 25k.

Today, I just got on the car, and tried some gears.

But it doesn't stay at 5th.

Does it mean 5th gear is gone?

And..., is there any way which I can check my compression?

 

If it is slipping out of gear it isn't the synchro.