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My 2009 TCH also began to knock and rattle on occasion. It occurred for the first time this past winter. The car sat idle for a day or so. When I started the car, the engine rattled and knocked as though it wasn't getting any oil. It happened again also a cold start after it had been idle for three days and the temperatures were more spring like. I discussed it with my mechanic and he really had know ideas but like me wondered if the engine was getting oil. I might try using a thinner viscosity oil. I currently use 5W-20 which is approved for THC. I may change to 0W-20. I currently have 53000 miles on my TCH.
I've had vehicles that were prone to be a bit noisy at first after sitting without running for a period of time. Not sure that thinner oil is the solution. What's happening is gravity doing it's thing and oil working it's way down to the oil pan. As long as your oil level is OK and the oil pump is functioning properly, it's sort of normal for the sound of the engine to be a little different until the oil pump gets things moving around again. It's usually a couple of seconds for me, maybe longer, depending on the temperature. If the noise doesn't stop for an extended period of time, double check your oil levels before moving on to try and diagnose an oil pump issue.
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