You need 8,10, and 12 at least. Snap on has a description of the uses for each. Needed one to replace the starter on my 86 Jetta. They hold in the half shafts in vw, Audi, Porsche. Need one for some VW seats. I think I've seen them one break calipers. I think VAG uses them in high torque applications. Little chance of using cheap tools or torx and being successful.
In my opinion, these specialty bit sockets are not a good place to skimp. You really only get the one chance with these fasteners. I have Snap On.
Watch out for Chinese made versions. Asian manufacturers use a fastener that looks almost identical to a triple square. It's called a bi hex I think. The corners are 120 degrees instead of 90. Beware of stuff called spline something. You need to know if it is triple square or not.
One more thing I know SO is crazy expensive, tho I've had good luck on ebay. Bought a set of 5 in 1/2 drive for $120 like new. In my mind at least, if I can complete a repair instead of sending my car into a dealer or even an Indy, I just saved the cost of that tool in one job. At least with German cars, or older German cars, I think I could easily justify the few thousand dollars I've spent on tools.
As I've gotten older, I've worked on my cars less. Either cars have gotten better, or I can now afford better cars. But I'm getting ready to work on my kids cars. I think I could probably justify getting a lift and maybe even a good scanner. Even brake jobs are so expensive now. And I trust shops less than ever. I think some take advantage of people who know nothing about cars.
My advice is to avoid a $40 set from Vim. For less than $100 more you can get Snap On, or if you prefer hazet get those. But get the best quality as they will pay for themselves.
I guess I personally don't think Chinese tools make good economic sense. If you are going to work on cars on your own time, get the best tools you can.
