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It could be the seals or it could be the valve stems themselves getting worn (I wasn't sure if anyone came to a 100% conclusion on that one). From what I gathered from the threads, it's probably just a bad design where the stems get worn prematurely due to misalignment.
The car ran OK. It was just embarrassing when the 745 smokes like an old diesel truck, actually much more so than if I were driving an actual old truck that smoked.
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