They didn't change the oil? Thats not good....
And not to offend you or make you angry... The 3800 is a Buick Motor..
When my intake first died I had changed the oil and noticed that it was getting dirty in a hurry... I was using synthetic at the time... And put in more synthetic with the change... The the coolant level started doing a drop, till the point it was smoking( burning coolant )... I was slowly loosing coolant for a month.. Had the car at the dealership 3 or 4 diffrent times... They found nothing... The intake finally ruptured... And when it was repaired, they did not change the oil... I noticed the oil pressure was a bit off( lower than normal )... The oil was as thin as water and almost black again... It came out as thin as water... I refilled with somw cheap 10-30 and changed the oil and filter again a coupel hundred miles later... I got luck both that I was using synthetic, and that I'm a freak about oil changes... Sorry to see that you are having problem..
Change the oil, get an AC Delco PF47 Filter... See if the tick or tap goes away.... It just doesn't sound good from what you have described..
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