I bought a second-hand car about two months ago which started developing a ticking sound from the engine bay. The sound is coming from the top/passenger side of the engine. This ticking sound is only there when the car is idle. It completely disappears when I go past 1000 rpm. I have even tested it in a tunnel to make sure it disappears. This only happens when the car is warm as well. When I start the car in the morning the sound is not there and does not come until the car has been driven/warmed for a bit. The previous owner was a very old man in his late seventies and he had no crash/maintenance logs. He never drove the car above 90 KM/h when he had it in his possession. When we first bought the car it was near perfect until I pushed it to around 120 KM/h a week after we bought it. It started making the sound from that day. We thought maybe the oil is bad so we went and did an oil/oil filter change. The sound went away for around a couple days then came back so we took it to a mechanic. He disassembled the engine and told us what the problem was but I am not a car-savvy person and do not remember what he told us. I only remember him saying that the "crankshaft" needed changing. Once he gave us the car back the sound had completely disappeared. It stayed like this for around a month until the sound came back around two weeks ago. From then we have changed the oil/oil filter twice. Each time the sound disappeared for a couple of days and then came back. I wanted your honest opinion before we have to take it back to another mechanic and get ripped off again.
This car listed above has a four speed transmission with 280,000 KM mileage.
Check engine light on.
Oil being used: Mobil Super 1000; 20W-50 XHP.
Link to video of my car:- https://www.youtube.com/watch?v=zMfMyhurojE&t=1s
Recent maintenance - Transmission oil change only because of leakage (not filter).
A/C compressor electricity wire was loose.
P.S.: I live in the middle east where the temperatures can hit 40C mid-day.
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Saturday, October 28th, 2017 AT 11:27 AM