The oil thread

   #21  

Uwe

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You cannot use VW 50800/50900 oil in current engines that require 50400 or VW 50700 because the lubricating film of 0W20 oil is less stable at high temperatures.
One thing I find puzzling: We have what appear to be identical engines that were once specified (and presumably designed for) 504/507 oils, where around 2018 VAG changed the spec to 508/509. Did did anything in these engines actually change, or did VAG change the oil spec in order to get fractionally lower consumption/CO2 emissions, quite possibly at the expense of engine life?

This, obviously, is more important in countries without speed limit than in countries with speed limits around 70 mph.
Speed limits are by no means the only factor that affect engine loadings. You've mentioned towing as one, which I certainly agree with, but also consider just driving in the mountains, where on a long up hill grade, your engine load could be just as high at 70 mph as it would be on flat ground at 120 mph or more.

-Uwe-
 
   #22  

alexnoe

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One thing I find puzzling: We have what appear to be identical engines that were once specified (and presumably designed for) 504/507 oils, where around 2018 VAG changed the spec to 508/509. Did did anything in these engines actually change, or did VAG change the oil spec in order to get fractionally lower consumption/CO2 emissions, quite possibly at the expense of engine life?
Concerning petrol engines: it's possible that this is mainly a CO2 emission optimization.

Concerning diesel engines: VW has launched EA288 evo engines in late 2019 together with the Golf Mk8, so these are model year 2020 and newer. I did't check all engine codes, but my impression is:
- EA288 always use 50700
- EA288 evo with 85 kW and 110 kW use 50900
- EA288 evo with 147 kW uses 50700
It's simply a different engine.
 
   #23  

davisev5225

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Anecdotally, I use Liqui Moly 20232 Molygen 5W40 in my 2013 A6 Quattro Prestige 3.0T and previously used it in my 2006 A6 Avant Quattro 3.2L. The 2006 ran like a champ well through 200k miles on that oil until I sold it. New owner was cheap and used Wal-Mart oil, car started falling apart within a couple oil changes.

Unless/until I find hard evidence to the contrary, I stand by Liqui Moly because it has worked quite well for me. I do get slight oil consumption issues with it, but I change my oil at 5k miles anyway, so it doesn't bother me. :D
 
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