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Is it time to change oil viscosity?

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TURBO2

Member
Joined
Feb 2, 2002
Messages
262
I have a 1986 GN with around 108,000 miles on it. I'm using the factory suggested 10w-30 and have about 70 psi oil pressure when cold, but once it heats up the pressure drops to only about 17-18 psi. Should I switch to 10w-40 or 20w-50?
 
Many dont agree with this but i run Vr1 20/50 in NY summer and 10/40 in the fall/winter for 20 years , with only showing a 3 psi hot idle difference

A front mount will put you over 200 degrees on the streets without good dual fans
 
Only my opinion but I wouldn't run a thicker oil with that cool of an operating temp especially with the fan upgrade.
 
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