oil in coolant but not in engine... thoughts?

[Steve Tinker]

According to the experts, head gasket failure is rare on these engines. More likely is a failed heat exchanger or rubber O rings where the exchanger seats to the block. Oil usually gets into the coolant more often because of the higher oil pressure forcing it into the coolant.
I would remove the exchanger and have it pressure tested & replace if required (or turf it for a new larger S exchanger). New O rings are cheap.
Use the search function for heat exchanger and see the dozens of failures - you may be lucky and have a good engine cheap ......

[JFP in PA]

Originally Posted by Steve Tinker

According to the experts, head gasket failure is rare on these engines. More likely is a failed heat exchanger or rubber O rings where the exchanger seats to the block. Oil usually gets into the coolant more often because of the higher oil pressure forcing it into the coolant.
I would remove the exchanger and have it pressure tested & replace if required (or turf it for a new larger S exchanger). New O rings are cheap.
Use the search function for heat exchanger and see the dozens of failures - you may be lucky and have a good engine cheap ......

Steve is spot on; oil cooler failures while not common, do happen with these engines. Pull the cooler and have it pressure tested, a new one from a dealer is only about $200, but be sure to always use new O-rings.

[seventythree]

If you end up needing an oil cooler, I have one in excellent to mint condition.