Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
See also:
Tachometer
The tachometer displays the engine speed in revolutions per minute (rpm).
Notice: If the engine is operated with the tachometer in the shaded
warning area, the vehicle could be damaged, and the da ...
Halogen Bulbs
WARNING!
Halogen bulbs have pressurized
gas inside and can burst if you
drop or scratch the bulb. You or
others could be injured. Be sure
to read and follow the instructions
on the bulb pac ...
Under the Hood
Cadillac's 4.6-liter Northstar V-8 comes in a choice of two configurations in
the DTS. The L37 edition produces an estimated 291 horsepower at 5,600 rpm,
while the LD8 is rated at 275 hp at 5,200 ...