"synthetic" doesn't necessarily mean what it once did - but the price didn't drop.
Does Porsche still recommend Mobil-1, now it uses a Group III+ base stock? This apparently means it cannot be described as "synthetic" in Germany, as they regard only Group IV (e.g Royal Purple) and Group V (e.g Redline) non-hydrocracked base as "synthetic"...
Elsewhere, they simply re-defined what "synthetic" meant; from the 2000 oil trade rag Lubricants World article
Is Your Synthetic Motor Oil Really Synthetic:
Quote:
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Exactly one year after the National Advertising Division (NAD) of the Council of Better Business Bureaus’ ruling in April 1999, upholding Castrol’s position that wax isomerates could be called synthetic, Petro-Canada (Toronto) advertised it would be referring to its very high viscosity index (VHVI) basestocks as a synthetic in the North American market. These products fall into the same API group (Group III) as wax isomerates, but could vary significantly in quality from wax isomerates. This market roar by Petro-Canada has carried a quiet undertone of moves from PAO to VHVI technology by several engine oil marketers.
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What does this mean, really? Darned if I know, not my field - and this gets more complicated than picking a cell plan...
I run Rotella T in the 930, cheap, available, good additive pack. It seems to like it.