Hey guys, my father has a 2013 TDI golf with approx 324000km(201324 miles). Oil used in the car is Rotella T6 and oil changes have been completed every time the counter in the car indicates the vehicle is due. Recently he ran into a no start situation which was diagnosed as a clogged DPF by VW. The DPF was changed under warranty at the dealer and when the tech started the car he claimed that the oil light came on so he checked the oil and found it was down roughy 2 quarts. Tech decided it would be better to just change the oil completely. So tech pulls the oil plug and oil leaves the pan very slowly, and is stating he believes the engine is heavily sludged up and wants to pull the oil pan for further inspection. It’s at this point that I instruct my Dad to have the car towed to my place as this wasn’t adding up, I performed the last oil change on the car and noticed no issue at all with the oil draining. So car comes to my place and I pull the oil pan off and find massive amounts of this jelly sludge. It has a rubbery texture and breaks apart fairly easily in your hands. I was able to clean out the oil pan fairly easily as it doesn’t appear to stick to aluminum very well, the windage tray and oil pickup(plastic) however is a different story. I’m currently soaking these parts in varsol, which has helped with loosening the deposits however deposits do no appear to be dissolving, rather it looks like a bunch of permatex silicon floating around in the varsol. In doing some google searches I saw that coolant in the oil can cause this sort of thing, however we haven’t had to add any coolant to the car. Car had some front end work completed a couple of months ago, I’m concerned someone may have sabotaged his engine figuring him has an easy target(he’s 80 years old) . Would love any and all feedback!! Thanks!!