Took Otto to the mechanic (an honest-to-God VW lover) and he deduced the following: He thinks the oil pump is a bit weak, and that the combo of our steeply inclined parking area & the 20-50 oil cause the knock. He suggested running 10-40 until the pump gets replaced. He thinks I can hear the knock so well because of a huge hole on the top rear (!) of the muffler. :P Whew. I don't think we'll switch oil right away, but I am going to park on the flat section of the drive. Thanks one and all! Mike Wright 68 Camper (Frau Blucher) 79 Bus (Otto)
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