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Mobil 1

I have asked for Mobil 1 15W50 synthetic and got the answer - not imported
to Denmark.
To day I called the importer my self and got a "technical talk"
 He have Mobil 1 Racing 4T 15W-50 for sale; but would not
prefer that for my 200QT. He say: 5W-50
He agreed, that the high temp -50 was good, but too thick to start at, and
that the 5W-50 would give the same or even better protection at high engine
I was confused - according to Mobil 1 homepages -
a) Have a look again - they compare to -30. And say -50 for turbos - OK
b) The Mobil 1 Racing 4T 15W-50 is made uppon an older technologi
    because it is designed for use in Japanese motorbikes, where the
   wet-sump clutch uses engine oil. And there have to be some friction in
   for the clutch to work.
    The 5W-50 don't have that to care about.
    It just lubricates the best it can!

I was very close to ask him about Castrol 10W-60 Racing - but thought
it was'nt fair