From 2005 to 2016, nearly every BMW came with an oil filter housing and heat exchanger gasket setup that's almost guaranteed to fail and leak oil over time. In this video, I walk through the entire repair on a BMW X3 — how to identify these parts, how to spot the leak, and the complete step-by-step process to replace both gaskets yourself, including proper coolant vacuum-fill and torque specs.
Timeline:
00:00 – Intro: what we're fixing and why these gaskets always leak
00:54 – Identifying the oil filter housing and heat exchanger
02:41 – How the heat exchanger works (coolant vs. oil layers)
02:43 – Spotting the actual oil leak on this engine
03:48 – Same leak on another car — how common this issue is
04:19 – Draining the oil before disassembly
05:36 – Draining the coolant (DIY bottle-catch method)
07:46 – Activating the electric water pump
09:11 – Removing the plastic engine cover
11:03 – Inspecting stripped threads
12:00 – Removing the heat exchanger (3 bolts)
14:09 – Removing the filter housing & disconnecting sensors/hoses
18:04 – Plugging oil passages & removing old hardened gaskets
18:56 – Comparing old vs. new gasket
19:33 – Installing the new gaskets
20:31 – Cleaning mating surfaces before reassembly
20:34 – Reinstalling housing & heat exchanger
21:34 – Torque specs & the "muscle memory transfer" trick for tight spaces
23:07 – Reconnecting sensors and hoses
23:59 – Reinstalling the plastic cover (correct alignment tips)
25:06 – Vacuum-filling the coolant system
26:31 – Bleeding air & topping off oil
26:43 – Final test drive and wrap-up