87 Spider bubbles in oil

[Robert Abatecola <robert@domain.elided>]

Since my last oil change about 3 weeks ago I have been seeing bubbles 
on my Spider's dipstick when I check the oil.  Once the car warms up, 
the oil pressure is lower than I'm accustomed to seeing.  The level 
is OK and does not appear to be dropping.  I always use the same oil 
(20w50 Castrol GTX) and the same Alfa Romeo filters (the small 
version) changed every 3 months.  I don't recall ever seeing this 
before.  Are the bubbles something I should be concerned about?
-- 

  -Robert Abatecola, San Jose, CA
   1985 GTV6
   1987 Spider Quadrifoglio
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