long story short

the low coolant light in my mother's chevrolet (2001 chevy impala 3.4) came on. i am unable to determine whether or not the resivoir was actually empty, or if it was just a sensor malfunction. 3 weeks ago, while i was changing the spark plugs, the level was above cold, so there was an adequate amount in it.

arrived at her house today to see a half empty jug of prestone all-makes all models antifreeze sitting on the shelf.

i flushed the system out and put new dexcool in the car in november 2007, less than 12k miles ago.

is there a reason that prestone still sells a separate dex-cool product, or is the all makes all models stuff good to go in this application?

thanks.