VW Passat 1.8t When the car is cold, as soon as i turn the key and for only like a fraction of a second the motor has a slight knock. Im talking half a second to 1 second. I guess it takes a that much time for the oil pressure to kick up? Its this normal or could it be a slightly clogged pick up tube? It seems like its starved for oil for a second then the noise is gone. Its sounds like a rod knock. The car has to sit for a few hours to have this happen again. 140K miles on the car, new oil Shell Rotella T6 and a big oil filter. It was doing this before but not as bad. IM using a Mobil 1 Oil filter.