online GM technical data sources


I'm not trying to shill for them, but I didn't see an equivalent service from any CF vendors (or did I miss something?)
I've searched CF, seen that a number of posts refer to data from www.alldatadiy.com, which I take as a sort of endorsement on the value of the service. Haven't seen any negative comments.
What do people know about the service? Is it worth it? Do commercial, non-dealership auto repair shops use this or something else? Are there other comparable services out there?
What kind of data service do GM dealerships use?
I accessed tons of info at his shop when I had my 91 C3.
As far as I know GM used their own data base.
And $30 bucks for 5 yrs doesn't sound all that bad of a deal. I may look into it myself !
I'm not trying to shill for them, but I didn't see an equivalent service from any CF vendors (or did I miss something?)
I've searched CF, seen that a number of posts refer to data from www.alldatadiy.com, which I take as a sort of endorsement on the value of the service. Haven't seen any negative comments.
What do people know about the service? Is it worth it? Do commercial, non-dealership auto repair shops use this or something else? Are there other comparable services out there?
What kind of data service do GM dealerships use?









