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Most GM gauges are designed to have the needle straight up (vertical) when a system is operating properly. Obviously, there will be variation in either direction from that, but it's a good 'rule of thumb'. That allows you to quickly assess performance without having to actually read the dial.
Oil temps are better when higher than 180*F and lower than 250*F. But, synthetic oils can take a lot more heat (near 300*F).
Most GM gauges are designed to have the needle straight up (vertical) when a system is operating properly. Obviously, there will be variation in either direction from that, but it's a good 'rule of thumb'. That allows you to quickly assess performance without having to actually read the dial.
Oil temps are better when higher than 180*F and lower than 250*F. But, synthetic oils can take a lot more heat (near 300*F).
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.