I used Motul 8100+ 5w30 for some time in between and now went to US spec 5w40. In the EU the recommended OE oil is Castrol Edge 5w30 and the HTHS on that is miserable. The link posted from BITOG is a long but informative read. It was recommended I could go much longer on the OCI with the analysis findings I was getting for the RLI. What I noticed most is less soot on the tailpipes, and it I don't have to add much at all for a 5000 mile OCI which sure was not the case with Motul which I have tried twice. Analysis has been historically good, although I don't do it anymore. However, I haven't heard much else since or anyone after coming to understand these cars at high milage running this Bio-Syn oil.I use Renewable Lubricants (RLI) 5W40. There was an oil analysis/comparison that was done around when these cars were new and the tester had concluded that Renewable Lubricants 5w40 was the best (link included). I know there are many other factors that play into this and is an age old discussion (carbon buildup is just a way of life with these beasts). Here's also a nice longevity study they did with a racing Beetle They use it in a lot of race engines and I figured it would be an ideal oil for our carbon filled motors. A higher base value of the oil will help it stay non-acidic for a longer time even tough it gets constantly mixed/contaminated by exhaust blow-by (which happens in any crank case, even if the blow-by is minimal). They have a decent HTHS, a bit better than Motul 300V race oil, but the fact which got me hooked is the TBN (Total Base Number), which exceeds any other manufacturer i checked by A LOT and is very good for our carbon rich high-revving engines. I had a look at Millers oil and what they started bringing to the market recently and I opted for Millers Oils CFS 5w-40 NT+. However, I haven't heard much else since or anyone after coming to understand these cars at high milage running this Bio-Syn oil.In the EU the recommended OE oil is Castrol Edge 5w30 and the HTHS on that is miserable. Mobil 1 (HTHS)- 3.6 / Liqui Moly and Motul also share this HTHS Interesting fact, so I looked up two of my favorite 0w40s:
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