Annnnnd, we're back. Massive Lifter Knock in my 5BW

[ATL_Bwing]

Well, here we are again. Had the oil changed in my 5BW on Friday at a Cadillac dealership (yes, same as previous dealership and the joyride issue. Lesson definitely learned). Drove the car Saturday, no issues. Drove the car again today, did a pre-trip inspection and checked the oil, clean and no issues. Drove ~25 miles to a meet up and when I got off the freeway I noticed a massive lifter tick. The car did not display any warning lights...check engine, low oil, none at all. But I immediately shut it down to be safe, waited an hour and checked the oil. Levels were fine so I fired it up, tick immediately returned and I noticed my oil pressure was spiking. I had it towed to Cadillac and am waiting for their diagnosis tomorrow AM. Inspected the undercarriage of the car when it was on the flatbed, and my garage when I got home, no signs of leaks or drips.

In doing my own research, all signs point to a mistake by the service team...either wrong oil weight, over-filled oil, or filter issue. Fingers crossed no long-term damage was done to the engine. What are your thoughts? And what should I be leery of when the dealer calls me tomorrow with their update?

Appreciate your thoughts and perspectives.

 

[RDATLTE]

Check your invoice for the oil and filter part numbers that they used. You can google them to see if they used the correct ones.

 

[thefleshrocket]

Spiked oil pressure suggests a restriction somewhere--my guess is in the filter--which caused oil starvation.

 

[BigShark]

Definitely sounds like they either double-gasketted the oil filter or used the wrong filter causing that pressure spike and starving your lifters.