I recently converted this Cab from Auto to Manual because the Trans Cooler had leaked and dumped the coolant into the Auto.

Having just got to the point where I was really very happy with the car and all bugs under control, the vehicle has just dumped a signicant amount of oil laden water out of the expansion bottle. Oil does not show on dipstick. Oil filter full of caramel cream. Totally scary.

Given that I think it happened in a short period of time, there may be hope of the internals being OK. No noises evident when the vehicle was used and running (well) as usual.

So, I will flush both cooling and lubrication systems, but I still haven't established the cause......

I am suspicious of the heat exchanger above the oil filter, so will start there, but can anyone suggest other opportunities for fluid exchange(before I dive into the head)?

Once again, wise words appreciated.