Motor oil leaking into overflow

Sounds like you have a crack head,if so,you will need another motor.Find a reputable engine installer and have them check the problem out and go from there.

Head gasket or cracked blocked

Yes it could be a leak in the hose between the radiator and the overflow tank. The tank is supposed to hold excess coolant when the engine is hot and then release it back into the radiator when the engine is cool.

A couple of things that are problems on Alero's are the waterpump, thermostat and the overflow tank.

The thermostat can be stuck closed, so the engine isn't cooling. The overflow tank can crack on the bottom of it, leaking fluid out....BUT, you would notice this if you checked your driveway or your fluid is low. Are the fans cycling on and off like they're supposed to? If it's none of these, I'd look at possibly a new radiator.

Sounds like your oil pressure sending unit may be leaking can you access and see exactly where the oil is coming from?

Is the low oil pressure light on?
If the tappets are not noisey and the motor is not making any abnormal 'rattly' noises you may only have a faulty oil gauge pressure sender.
Replace the pressure sender, and if there is any remaining doubt get the oil pressure checked with an independant gauge before driving vehicle further.

Yes, oil in the antifreeze typically comes from a blown head gasket. To verify, start the truck and watch the overflow tank you should see what looks like a back flow or bubbles. By the time the truck get to normal temp, it'll be obvious.

Use Valvoline 10-30. Manufacturer Recomended.

I believe the other one is underneath the motor mount, which means you will have to remove the mount of you need access to it..

Suggest you check your engine oil, it should be either light brown if just replaced, and black if you have over 30K miles on it.

If the oil is brown like in color, maybe you have an intake manifold leak and anti freeze is getting into the motor oil (Bad Bad) Check for leaks in the heater core inside the car and see if the rugs are wet.

Check radiator for discoloration in the fin areas and tank areas. Finally check your radiator cap, maybe its defective and you loose antifreeze through the overflow.

hi there is there alot of oil in the plastic overflow tank ? what color is it ? when did you notice it ? does the engine run good is it shakey ? take a peek at all ur spark plugs you want them all to look the same slight brownish color is normal. lots of white on the plugs means coolant is getting on them under heat and pressure they get clean too white this is usually a head gasket damaged and leaking a little coolant into cylinder burning and being exausted through the muffler and you might see a white smoke from tail pipe, saying that coolant would not be going in oil that way . if its automatic trans there is a transmisson oil cooler built into the rad now tranny fluid runs through the rad cooling transmission oil coild get from transmission into rad in turn, getting into plastic over flow container. is there coolant in the engine oil ? the oil level will be a little higher than normal if there has been coolant getting into motor ? theres also another way that ive seen coolant enter the oil through the intake manifold gasket its tough to decide ehere the leak is , does it run and idle smooth ?
after a long ride in the hot daytime sun after you turn off let it sit for 20 min then pop the hood and with gloves on swueeze the upper rad hose and check if theres pressure in it dont open cap as im shure you know. if there is a coolant leak depending on how bad it is you will notice that there will be very little or no pressure in you upper rad hose need to pressurize the coolant in order to cool engine correctly. well i hope i havent said to much at once , take a close look at all questions and write me the answers maybe we can pinpoint the problem for you
1 rad transmission cooler
2 real bad head gasket or cracked head
3 intake manifold gasket how does it run and idle
anyhow i hope i helped you a little until next time
bye good luck get back to me please