Today at 3:15 PM #1 T 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?
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?
Today at 3:20 PM #2 dynoman Well-Known Member TurboBuick.Com Supporter! Joined Nov 30, 2009 Messages 2,738 Same as mine with 10w30 .... 70psi cold -- 18psi hot idle .
Today at 3:34 PM #3 T THensley Active Member Joined Mar 13, 2022 Messages 302 stay where your at all good
Today at 3:43 PM #4 deezdad Jackie's cashing in on your wretched disfigurement Joined Mar 25, 2005 Messages 1,336 What temp tstat? Stock, 180, 160 ?
Today at 3:47 PM #5 T TURBO2 Member Joined Feb 2, 2002 Messages 262 deezdad said: What temp tstat? Stock, 180, 160 ? Click to expand... 160, but it goes beyond that since I put in the front mount intercooler. I have to put in some higher rate cooling fans to fix it.
deezdad said: What temp tstat? Stock, 180, 160 ? Click to expand... 160, but it goes beyond that since I put in the front mount intercooler. I have to put in some higher rate cooling fans to fix it.
Today at 4:01 PM #6 V6sleeper Turbo Buick's since 1988 TurboBuick.Com Supporter! Joined Jan 18, 2011 Messages 2,326 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
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
Today at 6:21 PM #7 deezdad Jackie's cashing in on your wretched disfigurement Joined Mar 25, 2005 Messages 1,336 Only my opinion but I wouldn't run a thicker oil with that cool of an operating temp especially with the fan upgrade.
Only my opinion but I wouldn't run a thicker oil with that cool of an operating temp especially with the fan upgrade.