Oil preferences

[trunnell@mindspring.com]

Hi,

Since I installed my oil pressure gauge I am amazed at how much the viscosity 
drops during highway driving especially on hot days.  I am currently running 
Castrol GTX 20-50.  After driving about 40 miles to work at about 65- 75 mph 
the oil pressure will drop to about 45 psi at speed and about 15 psi at idle.  
Around town the pressure drop is not as bad.  Has anyone had better success 
with a different brand of oil. I don't have an oil cooler, but it's looking 
like I might need one.

Thanks,
Glenn