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Which Brand of Oil



I appologize if this is beating a dead horse but this oil thread got me
thinking. I used to use Castrol Syntec 5W-50 in my '86 4Ks(4cyl) and
thought it did a very good job.  After 104K miles my motor used no
significant( if any) amount of oil in the 7K miles  between oil/filter
changes. When I sold the car I had the emissions done and checked the
compression - negligable emissions and very even readings (in the 190's
psi) for all four cylanders.  I recently bought my '89 90q w/117K on it
and when it came time to give the first oil change I debated for days
whether to go with the Castrol or with Mobil 1. I wish to preserve the
engine's current condition.  I ended up going with Mobil 1's new 0w30
product and a Bosch filter because of qlister's comments about Mobil 1
and questions about Castrol's additives.  I've looked at both company's
www sites and aside from some good general knowledge, all the propaganda
further delayed my decision.  After this long preamble, my question is
this... Does anyone know of any good hard facts comparing Mobil 1 to
Castrol Syntec(full synth not blend)?
BTW I am happy with the Mobil 1 but I still wonder if Either brand is
better/more detrimental.
TIA,
chris perry
drivin' Audi's since '75 (miss that FOX wagon)