Originally Posted by ZOperaMan

I can tell you that my '09 hits some sort of wall (significant loss of power and acceleration) sometimes when I've been driving "briskly" at 65+ speeds for about 45-60 minutes on Houston freeways in the summer. That's the only condition where I've experienced it -- feels like a fuel line restriction; kind of like someone suddenly transplanted the engine from a Dodge Neon into my Z.

My temp gauge indicates about 220 when this happens, BUT it goes away after a few minutes of idling after exiting the freeway; except that the temp gauge usually stays at 220 for longer than that (it happened yesterday, and fixed itself once I hit stop and go streets -- oil temps never fell below 220 until I got home). This makes me think it's not _directly_ related to oil temperature, whatever it is.

I do think it's temperature related, though, because it never happens below 215-220 -- except it doesn't happen every time oil temps hit 220.

I've seen the oil gauge indicate as high as 230-240 in heavy traffic without noticing the power loss.