I have a 98 malibu that has been sitting since Oct and there appears to be water in the oil. It has anti-freeze in it so it shouldn't have frozen up. What do you think would cause this?

Pressure test water system,,,,,should show where leak is

Sometimes, not the heater coil...this leak usually smells inside the cabin...can you see anti-freeze build up anywhere? These motors are more prone to a water pump leak (needs replaced, inexpensive and not to difficult) or the intake manifold gasket...more costly about $400. for a mechanic to do...you should see some anti-freeze build up around the intake bolts...this assumes that there is no water in your oil...which is far more costly as this indicates an internal cylinder head leak...Could be just a hose leak...a bad radiator cap...or thermostat housing leak, (maybe a cracked housing? Help me help you...do you see any anti-freeze build up anywhere? Hope this helps.

Pour anti freeze and recheck. antifreeze will not evaporate as water does.

maybe there is a crack in the hose and air is getting in and heats up the water and anti freeze you should buy a new radiator hose that should fix the problem

If your engine is running fine with no miss in it possibilities could be radiator fan or water pump if the radiator fan is working fine it could be the water pump. I have seen a water pump after removing it where the fins on the pump were completely worn out causing the overheating.Let me know how this turns out for you thanks.

can you tell me more about your complaint ?? Are you using straight Anti freeze??, Lee

A car this new should have a warranty right? the only other place for anti-freeze to go is through a blown headgasket into your oil. Pull out your oil dipstick and make sure it is not milky in color. If not check behind the engine and see if any coolant lines going into the firewall are leaking. When inside the car do you smell steaming coolant(anti-freeze) or hear gurgling? The temp gauge that stays on is the overheat indicator?

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This is the anti-theft PASSLOCK system. You can purchase a paslock 2 bypass system that will bypass the anti-theft othewise you will have to wait the 10 minutes with the key on the ON position and turn over immediately when anti-theft light turns off

YES it has freeze plugs

A blown head gasket will cause water to get in the oil. Check the spark plugs, if you see anti freeze on one of them, then I would say a cracked block.