Hello Sam,
     I would stay away form 30wt oil for summer use unless it stays cool
where you are.  I tried using 30wt this spring, as an intermidiate
weight oil.  Several weeks ago I spun a bearing on the way home from
work.  As the spring temperatures increased I started getting the
intermittant oil warning buzzer, at off ramps and other times after an
extended run at highway speeds.  I planned to change the oil, but
working 60hrs a week kinda got in the way.  I'm not sure about what
exactly happened inside the motor.  I have'nt torn it down.  I do
believe that the thinner oil contributed to the failure.
     As a result I will only run 10w40 for winter and 20w50 for summer.
I have'nt been able to find anyone who sells 40wt oil.  The summers here
in Arkansas get kinda warm, it was 97deg last Sunday.  I will also
change it based on time as well as milage.
    Anyone know of a source for SAE 40wt oil??  Its what the volkswagen
recommends for tropical heat.
     Hoping to get my motor ordered this week.:-)

                Take care!
--
Colin Moran
Beebe Ar.
'86 Syncro GL
"The Bronze Brick"
200,000 and still dead in the yard