found some green today

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107
Location
Ohio
stopped by the local A.Z. today to see if they had any GC. I just learned about it the other day, and sure enough that had some. I'm assuming it's green because the # on the bottom starts off 04. Think my LS1 would like this stuff? Is this too thin for a summer oil? I usually put 10w30 in the summer. oh it was like 28 bucks for a case. TONY
 
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357
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none
No question - a match made in heaven. It is not too thin. The 0W refers to winter use (ideal because it is synthetic). The 30 refers to running temps; in fact it is at the higher end of 30 weight oils. For more info, research the archives.
 
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5,358
Location
Gone
Tony, You put GC in your LS1 and it will think you are just about the best owner a car could have...it is NOT too thin...and come to think of it, NOT too thick...in fact, it is JUST RIGHT...so that's why the Elves changed it to a gold color...in honor of "you know who."
 

toneloc12345

Thread starter
Messages
107
Location
Ohio
haha yeah I told my girlfriend that I wanted a case or too for christmas. One thing I am confused about... I know you want a thinner "w" oil for the winter like 0w30 GC. But why do many people change to a 10w30 for the summer? TONY
 
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357
Location
none
Don't know their exact reasoning. But one reason might be (broad generalization here) 5W-30 dino oils have VII (viscosity index improvers) which assists the oil for the W, winter use, number. They can break down (shear) over time. A 10W-30 therefore is more shear stable if you were doing something like my Buick's recommended 7500 mile oil change interval. Now with a synthetic, VII are not needed as the oil itself has the cold weather viscosity. Also, I would think newer, SM rated, dino 5W-30 oils are making it a moot point.
 
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5,358
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Gone
Tony, Simplified answer: many people see the 0W and think that means the oil is thinner at operating temperature; the 0W relates to cold weather/cold oil "flowability" at startup...what you are really concerned about is what is the oil's viscosity rating at operating temperatures and at those temperatures, GC is almost a 40 weight
 

Patman

Staff member
Messages
21,993
Location
Oakville, Ontario
GC and the LS1 engine are a match made in heaven. I've seen spectacular oil analysis results using GC in my 98 Corvette. I use it all year round.
 

toneloc12345

Thread starter
Messages
107
Location
Ohio
why would somebody want less "flowability" in the summer? I would think you would want the oil to flow as quickly as it could, even in the summer.
 
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5,358
Location
Gone
I wouldn't want less "flowability"...I am fine with 0W30 year round. Just keep in mind the "flowability" advantage is most realized at REALLY low temps...the SAE J 300 test is conducted at -35ºC and -45ºC.
 
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