Hello, I'm from France so apologize for the spelling mistakes ...
I took a few weeks ago my 2008 LEXUS ISF to an independent mechanic I know to install the USRS kit, bleed the brake fluid, repaint the front bumper, the bonnet and the 4 wheels.
I got my car back on Friday, February 9, I traveled 50 km to go home and everything was ok. The next afternoon, I drove 20 km and back in my garage I see a big leak of coolant and a big puddle under the car! The big problem is that the liquid is a little greasy and mixed with oil.
With a friend we found the origin of the leak: When I start the car, after 3 seconds, the big engine coolant supply hose becomes hard and the coolant leaks through the hose too much full right next to the coolant reservoir cap.
The coolant in the tank has a milk chocolate color.
What is your diagnosis? Do you think this is related to the passage of the car at the independent mechanic or is it a bad coincidence? I will contact my car mechanic tomorrow to discuss it.