Recently had Monro change the oil in my 91 940 SE Turbo. The car has only 115K miles and has never had any oil pressure issues since I got it 5 years ago. A week after the oil change the oil pressure warning light came on and has not gone away since. Oil has been leaking and drenching the area under the engine block. The drain plug is tight and the oil filter is dry. I did notice a hose came off that connects the turbo recently but I just put it right back on.

My question is about the turbo and if there is any possible relation to the turbo failing and the oil pressure being low...

Please advise and thanks!