Thought it was too good to be true, car lasted a whole three weeks since last repair.

any ideas what can cause this:

1. Dipstick Blown Out
2. Grey smoke when backing off full throttle (only at 100mph +)
3. Smoke on start up
4. Plug on cylinder 1 found with oil foul

Done a compression check and found all cylinders to be at 150psi so don't think it can be piston or rings as i first feared.

Could it be valve stem oil seals?

 

Stem seals

 

Thats what i thought.

That would explain oil burning and pressure increase causing dipstick to blow, yes, no

 

Blue smoke that clears once the engine is warmed up usually indicates worn valve stem oil seals

 

blowing cap etc off is excessive crank case pressure. Ususally rings. either that or blocked breather / no aftermarket breather (which I assume you have)

 

compresion test came out fine which i thought ruled out rings/pistons.

Got a grs oil sperator breathing into an oil catch tank with filter

 

what about if it's blocked? i.e one of the hoses?

 

will try that! but that wouldn't explain the oil foul on number 1 plug would it?

 

sorry, thats where my understanding stops