A hole in the sump

That depends from where the oil is leaking. One of the common leaks on older cars is rust holes in the engine sump. A temporary fix is cleaning the surface and using some JBWeld epoxy, but the full solution is to replace the sump. If the sump plug is leaking, replace the copper plug washer.

Oil leaks from an automatic transmission should be attended to ASAP, otherwise you risk expensive repairs. Less so with a manual transmission. Oil seal leaks, eg propshaft or axles, unless extreme, can be left till the next major service.

diesel engine - diesel fuel leaking from seals in the pump and getting into the sump oil
if petrol as on a mower , needle and seat defective allowing fuel to drain into the sump

No. The bigger issue is why is the oil level going down, assuming you do check the level, say, once a week. Oil leaks can be from
* the head gaskets on older 2.0 models.
* rust holes in the sump pan. Patch the holes with JBWeld or better, replace the sump pan.
* rear crank seal.

High oil consumption also occurs on older engines, say 180,000km or more, via worn valve seals. You'll usually see blue smoke blowing from the exhaust. The fix is recondition the heads, a major job.

There are at least three possible reasons for no psi in cyl No 4.
1. Burnt or damaged exhaust valve in that cylinder
FIX Remove head and replace faulty valve
2. Blown head gasket (water mixed with sump oil shows milky on dipstick and steam or water coming out of exhaust tailpipe, radiator water disappears )
FIX Remove head, grind flat and assemble with new gasket.
3. Broken piston rings, or cracked piston or burnt hole in piston.
FIX replace faulty parts.
Squirt some sump oil ( 2 or 3 spoonfuls ) through spark plug hole,
spin motor , and if compression PSI improves then it is rings or piston, if no PSI then it is faulty ex valve !!!

milky sump oil is coolant liquid in the oil. The leak may not necessarily be a head gasket but a corrosion hole behind the water pump impellor that is allowing water through the timing cover and into the sump. At this stage it will be a pin hole but it will get bigger.. Fix the problem as the water in the oil destroys the oil capabilities and will lead to engine failure.

AutoZone has free repair manuals online. I would guess you are just dealing with a sticking gasket. If it does need help you should find separate holes that are threaded on the pan.

1. Worn or broken rings on that cylinder
2. Valve guides or seals worn on that cylinder
3. To fix the rings you will have to remove the head and sump (Remove the motor from the car if you cannot remove the sump with it in the car)
4. Yes it will make your car run bad

hole in the sump leaking oil need to get it fixed will naff engine up
if left

the main fixing bolt holes are usually below the front bumper, at the sump guardand behind the front grille for the secondary holes

The punto's suffer from porous sumps. The metal becomes thin and leaks oil. Although its not a difficult job to change, its a messy job. You have to draain all the oil out first, then remove all the bolts around the sump pan. If you are replacing the sump, its good practice to replace the gasket too.
The sump itself is not too expensive to purchase, and the job itself in a garage, shouldnt take any more than 2 hours.

TL