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I have read all of above - thanks.
I believe it is prudent - in my case - to keep to Castrol.
Whatever car I buy in the future, I will go the same route - stay with Original engine oil.
The original question was also about transmission oils, and Barbera pointed out that oil in his transfer case had been "disgusting".
I have thought about it, and even if it is not something I will recommend, I will not change oil in transmission- none of it. Reason is that "all others were clean". I believe that, what was in transfer box is residuals from AWD clutches, which should not harm clutches nor simple gearings in transfer box. My understanding is that, unlike AUTO, there are no valves in transfer box. I have two cars and will not reach 100k km.
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