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The car's manual says "See Dealer" regarding which oil to use. Dealers (and service shops), in turn, use the range of oils Softconsult specified, depending on their preference and experience.
The filter I installed yesterday is the same Bosch available in Fastlane. The old rubber O-Ring was replaced with a new one, which was reseated properly. There was also a metal washer with the new filter. Did not know where it went, and set it aside. Did not see a similar one after removing the old filter.
The filter appears to be the most likely cause, since the readings are now normal for this engine. I doubt the 20-50 has much to do with it since it will not flow that much differently than 15-40 once the engine reaches operating temperatures. I will know for sure tomorrow, when the sender and the gauge are checked.
The only real "problem" is what I am accustomed to seeing when I look at the oil gauge. This is a different car, different engine and I will simply need to adapt to its different behavior.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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