Hello all, my 07 RDX has oil in the radiator, compression test is ok and no water in engine oil or transmission and I know the turbo uses both oil and water for lube and cooling but I don't know how the two can mix. It has 180,000 miles but I don't know any service history , only had it 2 months. Thanks for any help .

keep us posted on what you find.

i was hoping for your sake it is ATF fluid in the coolant ( as the ATF has a cooler that runs through the radiator), but if it is oil from the motor then you have a really bad issue.

maybe head gasket ? Turbo ? Or worse a crack somewhere in the engine

My first thought was the head gasket but a pressure test held 15 pounds for at least 3 hours.

And it has a new radiator

Did you do a dye test in the radiator and check for a bad head gasket? Worst case you have to check for a cracked head.

I haven't done a dye test and there is no sign of water in the oil or trans fluid and the radiator is a Denso but , yes it could be leaking. I keep looking ,thanks all

No problem I hope it works out for you, keep us all updated please.

Now I have water leaking from somewhere above the turbo , I need to find that first since that makes the car undrivable. Hints?

Do you have any pictures or videos of this new leak?

Found the leak, some hoses near the turbo, had to pull the intercooler and the air box ,also a good time to inspect the wastegate maybe correct the pesky 2263 code. Found some suspicious vacuum lines too.