I have used Smelecom for years with good success.
You can get by with an economical clone, but buyer beware, spend the money up front for good tools.
Maybe smok is good for you buy licence what you want
Good value for money is x-tool, the tool is really good.
If cheap, obdstar x300, digiprog3, xtool, carprog middle priced~ and very good tools, but you must have plan b, because 99% you get stuck sometime, and you need programmers, like upa xprog, just a few examples.. in the end, there are just smele, engima, diagprog, smok, its your choice how hard you work.
Part 2: mileage correction tool via Obd for Volkswagen group
I think FVDI can do it too
Coverage: Audi A3, A4(RB4/RB5), A4L, A5, A6, A6L, A8L, Q5, Q7, S5, R8, TT;
VW Bora, Beetle, Caddy, CC, EOS, Lavida, Magotan, Golf, GTI, Jetta, Passat, Phaeton, POLO, Scirocco, Sharan, T5, Tiguan, Touareg, Touran, Tansporter etc.
Fabia, Octavia, Superb, Altea,Ibiza,Leon etc.
I brought the obdstar x300M a few weeks ago
Great tool for the small price.
Part 3: a mileage correction tool for Renault, Peugeot, Nissan, Toyota, Honda, Lexus via OBD
You can buy obdstar X300M can dose some of car.
To be continued.