I have a 93 Subaru Impresa which leaks oil only when your driving,does not leak sitting or idleing. Any ideas

Answer 1

i own a repair shop,,and there's a lot of places it could leak from,it could be coming from a valve cover gasket,or a front or rear main engine seal,even an oil filter that's not on tight enough what you need to do is look and see which area of the engine its coming from,,without knowing that its almost impossible to answer the question,it may even be an oil sending unit on the engine they,ll leak bad sometimes,,there's just so may places it could leak from,that you need to look at it really good I'm sure you,ll see exactly where its coming from,,good luck i hope this help,s.

Answer 2

You should make the new generation forum at http://www.ultimatesubaru.net
one of your favorites. The folks there are mighty helpful.

One major source of leaks on these boxer engines is the oil pump. It is attached to the front to the motor and driven by the cam (timing) belt. This pump has no gasket and uses sealant on the mating surfaces. There is a single o-ring on the output of the pump, which is prone to flattening out. It leaks while the car is running from the pressure ouput of the pump.

If you look under the car at the front of the engine. the pump is right behind the main crank pully with all the belts connected to it.
There is probably wet oil on the bottom of it.

Usually, with fairly high mileage, the thing to do is change the timing belt, since it has to come off, the water pump, install a new o-ring and reseal the oil pump, and replace the crankshaft seal.

It fixed my leak. Some folks say to replace the cam seals as well, but mine weren't leaking.

Answer 3

I would bet it does leak when sitting and idling but you do not know it.
When sitting and idling in 1 spot the leaking oil is probably catching and sitting somewhere on the engine that it doesnt actually hit the ground, When you drive and like hit bumps, up and down small hills, turns the oil spills from where its sitting. Like holding a glass of water while sitting in your car. If you sit still the water wont spill, but once u start to drive it will start to move around and spill all over.

Answer 4

The way the engine is layed out in this car, the valve covers are bolted on horizontally. More then likely the oil is leaking from one of the covers. When getting this fixed, make sure that you change both sides also it is very important to change the PVC valve, as this is the valve that releases exes pressure from the engine into the intake. If this valve is choked, the pressure will leak out of the weakest point, in your case this is probably your valve cover gasket(s). Hope that helps...

Answer 5

Oil seals umm Valve Cover Gaskets

Answer 6

I would check the PCV valve and the vent tube to see if they are plugged. At higher engine loads, pressure builds up in the crank case and could force oil out of the seals.
P.S. The vent tube is not connected to the PCV valve (that has another tube attached to it) It's usually near a high point on the engine and connects to the air box,or somewhere before the throttle.

Answer 7

How do you know it only leaks while driving it? Do you get out while on the freeway & look underneath to see if it leaks?

Answer 8

if it is at the rear of the engine the rear main seal is leaking it won't leak much if the engine is not running there is no oil pressure

Answer 9

Cracked valve cover gaskets.

Answer 10

take it to a mechanic, or drive it as little as you can, other than that keep oil in it or it will break down