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Originally Posted by softroop
Here's a question for the forum: If a brand/grade of oil was on a previous Porsche Approved Oil list (TSB), but is not on the current list, should it not be used solely because it's no longer on the approved list?
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Two schools of thought on the subject;
1. Why was it taken off the "approved" list? Reformulation? Loss of approvals (e.g.: ACEA A3, B3, B4)?
2. Does the "list" really mean anything in the first place?
Discussion: Feel free to argue endlessly and without factual support................