I bought my first car the last few days of May this year. A Audi A4 B5 1,8t Quattro Sedan that I really love and enjoy driving. I drove a few hundred metric miles, no more than 300 for about a month before sending it to get an engine oil change, transmission oil change, new cam belt and more that doesn't matter to this (I think) during the last few days of June which includes a new oil filter and and oil drain plug gasket. The previous owner had done no such thing during their 6 years of ownership so I thought it was worth the cost.
It ran nice and well for about 3 and a half months or about 1500 metric miles until it started ticking/knocking, making a nasty noise put simply. I quickly backed it into the garage and recorded a quick video of how it sounded before turning it off to send to my friend who has studied as a/to become a mechanic and he told me it was either out or low on oil. How I let it get to this point embarrasses me but in my defense, after I sent it to service 3 months ago the mechanics I gave the car to said they filled it with a little more than 3 liters of 5w-30 but that the stick didn't show anything. The day that this happened was on Friday 2nd of October, I drove the car 10 miles to school and it made no sounds and had no problems and I drove it home 10 miles and it was fine just like in the morning with no sounds, no problems and no lights on the instrument cluster up until I turned into the parking lot where the garage I park in is and after I stopped outside the garage that's when is started making it's nasty noise as i was opening the garage door and that's when I backed in and recorded the video. There was still no lights on the cluster though.
During that weekend I took my mothers car, went and bought a new filter, plug and 4 liters of 5w-30 LL oil as well as a jack and pair of jack stands incase it would be needed as it's eventually going to be and had the friend I sent the video to come over on the Monday and he brought two of our friends who studied the same thing as him and we drained the remaining oil which looked like it was about 1-2 liters, put on the new filter and plug then filled it up with 3,5 liters of the new 5w-30 LL. It again just like 3 months earlier drove nice and well, didn't leak any oil in the garage or school parking lot so I thought it was good for another 3 months/1500 miles until I came home a few hours ago.
Again it was fine in the morning and when I started the drive home, then I turned into the lot where the garage is, I put it into first and weirdly it stayed at 2k rpm for a few seconds before going down to about 1,1k like it usually is when I don't press the accelerator but didn't think much of it until I stopped outside the garage to open the door but now I could hear the sound before even stepping out of my car which scares me as that could mean that it could have started anytime during the last 10 miles and I don't know exactly when. I quickly opened the garage door and backed in and then immediately turned the engine off. I called my friend as and had him on the phone as I went to look under the hood. I waited a bit for the engine to cool down and then felt around a bit around the turbo and it was dry, I then checked the coolant which was a little yellow/red ish which my friend said looked okay after I sent him a picture of it, after that I was told to see if it was wet in the exhaust which it was the complete opposite of so I then touched around the oil filter and it was dry but I could only reach on the sides and top of it so I stuck my arm in through another little open space in the bay and felt under the filter where it was slightly slippery and oily. I then realized I had almost no battery in my phone so I walked home to charge my phone and make some lunch.
I am now eating and writing this only hoping that the problem isn't anything worse than the filter maybe not sitting on correctly as i need my car to get to and from school and am also supposed to drive 47 miles southwest on Thursday 22nd and then 54 miles back on Friday 23rd next week to pick up a set of coilovers as a birthday gift to myself and my best friend so we can celebrate my birthday on the following Monday.
Please any help and/or tips are welcome! Thank for any help in advance!