Which o-ring to use, RED or BLUE?

[Hart_Rod]

I'm changing the oil pan/pick-up tube on my 6.2 2013 Camaro SS engine to a 2007 Cadillac CTSV oil pan/pick-up tube. The Camaro pick-up tube has a RED o-ring and the Cadillac pick-up tube has a BLUE o-ring. I tried them both and they both fit, but the red O-ring "seems" to fit better. I need to make sure I have the correct one in there because I don't want to have to change it out after I install the engine (or even worse damage the engine). Any suggestion would be helpful. TIA.

EDIT: the 6.2 was a AFM/VVT engine but I deleted both of those internally. The CTSV pan does not have the oil bypass like the Camaro pan does. Not sure if this makes a difference, but like I said I don't want to have to do this again.....

[BR3W CITY]

I always used the o-ring that came with the pickup, not with the engine.
I had the black and blue o-rings when I switched to the LH8 pan; I used the one that came with it, despite the fact that they even Mic'd out the same.

[Hart_Rod]

Originally Posted by BR3W CITY

I always used the o-ring that came with the pickup, not with the engine.
I had the black and blue o-rings when I switched to the LH8 pan; I used the one that came with it, despite the fact that they even Mic'd out the same.

That's what I was thinking, but it seems like the red one fits a lil better.
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[BR3W CITY]

Originally Posted by LS1Tech

Specifics:

1st design) Oil Pick-Up Tube O-Ring 12557752
Chevy/GMC Pick-Up (1999-2000 LS V8) 1st design
F-Body (1998-2002)
Cadillac CTS-V (2004-2007)
Corvette (1997-2008)
Thickness = 3.55mm (0.140")
ID = 23.60mm (0.930")

2nd design) Oil Pick-Up Tube O-Ring 12584922
Chevy/GMC Pick-Up (1999-2000 LS V8 engines with 2nd design pick-up tube)
Trailblazer (2003-2008 With LS V8 engine)
Hummer H2 (2003-2008)
Hummer H3 (2008 With LS V8 engine)
Chevy/GMC Pick-Up (2001-2008 LS V8 engines)
W- Body (2006-2008 With LS V8 engine - Impala, Lacrosse, Grand Prix)
Thickness = 4.20mm (0.165")
ID = 20.69mm (0.815")

to translate into the melling Oil pump O rings: the Black O-ring is for 1st design pick up tubes (all models are listed above), the Green O-ring is for the 2nd design pick up tubes (all models are listed above).

meow?

[Daaaanz67]

When I used the Ctsv pan on my conversion it was blue for me. I think there was a gm bulitin that changed from red to blue
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[Hart_Rod]

Originally Posted by BR3W CITY

meow?

Originally Posted by Daaaanz67

When I used the Ctsv pan on my conversion it was blue for me. I think there was a gm bulitin that changed from red to blue
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Thanks guys. Blue it is!!!
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[solidaxel]

O K, use the Blue O ring is that the 12584922 ?
What about the pan gasket anything "special" about the gasket for a 2003 5.3

Rob any surprises a year later?

[Hart_Rod]

Nope. Good to go.