Hello!
Apologies in advance for the saga that follows. I'm hoping you experts can provide some meaningful feedback on my UOA that can help me diag.
I drive a 2013 CC with the EA888 TSI engine. Car is quite modified with a K04 turbo and all supporting mods. Purchased the car in 2019 with 19k miles and it has 38k now. The first winter I drove the car, I noticed a slight rattle between 2 and 3,000 rpm. I shrugged it off as it didn't seem to get worse. Fast forward to now..I was under the car checking an exhaust leak and was revving it on jack stands and all of a sudden the rattle really stood out. Video here:
2,800 miles ago I had an indy shop install Supertech valve springs. In the process they resealed the cam cover (probably contributing to the Silicon levels) and did an oil change with LiquiMoly Molygen 5w40. When I heard the noise, I had a VW tech friend come by and listen with a scope. He said the rotating assy sounded fine, but acknowledged the rattle. I pulled the pan to inspect for any metal shavings if it's coming from the big end of the rods. When I pulled the magnetic drain plug, there was some very fine "fuzz" on it that wiped off silver. I took a sample of this oil and sent it into Blackstone. Attached is the report.
The high aluminum and iron for the OCI now is making me think it's a piston/cylinder wall issue rather than rod bearing. Really curious what all of your thoughts are on this and what direction it should guide me in.
Next steps for me is to borescope the cylinders to see if there is excessive wear and confirm or deny the piston slap theory. Compression is consistent at about 165psi across all cylinders.
Apologies in advance for the saga that follows. I'm hoping you experts can provide some meaningful feedback on my UOA that can help me diag.
I drive a 2013 CC with the EA888 TSI engine. Car is quite modified with a K04 turbo and all supporting mods. Purchased the car in 2019 with 19k miles and it has 38k now. The first winter I drove the car, I noticed a slight rattle between 2 and 3,000 rpm. I shrugged it off as it didn't seem to get worse. Fast forward to now..I was under the car checking an exhaust leak and was revving it on jack stands and all of a sudden the rattle really stood out. Video here:
2,800 miles ago I had an indy shop install Supertech valve springs. In the process they resealed the cam cover (probably contributing to the Silicon levels) and did an oil change with LiquiMoly Molygen 5w40. When I heard the noise, I had a VW tech friend come by and listen with a scope. He said the rotating assy sounded fine, but acknowledged the rattle. I pulled the pan to inspect for any metal shavings if it's coming from the big end of the rods. When I pulled the magnetic drain plug, there was some very fine "fuzz" on it that wiped off silver. I took a sample of this oil and sent it into Blackstone. Attached is the report.
The high aluminum and iron for the OCI now is making me think it's a piston/cylinder wall issue rather than rod bearing. Really curious what all of your thoughts are on this and what direction it should guide me in.
Next steps for me is to borescope the cylinders to see if there is excessive wear and confirm or deny the piston slap theory. Compression is consistent at about 165psi across all cylinders.
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