My speedometer started ticking, I noticed that especially after I filled the engine with an additive that supposedly cleans the sludge that had formed. I figured I'd have to spend a lot of money, after some research I came across people saying that a bad o-ring like this will result in oil not being properly drawn out of the sump and properly distributed to the valves. I also replaced the oil pan gasket and my speedometer runs much better. The engine is even quieter.
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