Since I purchased this R53 in pieces (and the cheapest in the Wold$300) lol...I have no idea how the coolant lines are routed.
The previous owner had a bypass plate installed to replace the oil cooler but later looped it because the remote mounted oil cooler was damaged.
I have the OEM cooler installed, but literally have no idea how and what the routing of the lines should look like.... RealOEM.com is somewhat of a help. But does anyone have
detailed pics or suggestions for the 03 MCS 6speed????

 

you are asking for oil cooler lines or engine coolant lines? i just replaced my coolant lines i can take some photos for you if you want the coolant line.

 

if the weather holds up this weekend I will be replacing all coolant lines...will get pics

 

Got some pics, will post below. Let me know if you have any questions I can try and clarify. Some of the hoses were hard to take photos of in the engine bay / hidden

 

On the left side of motor going towards the fire wall. The yellow clips are connected against the firewall.

these are two separate “mazes”...looks like they are connected in the pic but not. One is laying behind the other

From the top down, two hoses into the reservoir, one hose into a metal pipe (left side of the engine) and one hose into the thermostat housing. The skinny hose from the radiator goes on the skinny nipple below it (in the pic it’s not connected yet)

at the bottom two hoses on to two metal pipes that run along the back of the engine to the oil cooler

 

At the firewall, the curvy one connects to the bottom port

 

Some pics of them in the car

 

Here are some pics of the right side, oil cooler

 

Thank you for posting these, Ssoliman!

Wow, that routing is even more convoluted than I'd feared. I'm at just under 60K and really not looking forward to doing these but I know I should soon to keep the BMW leak demons at bay.

This will be a big help though, thanks.