I have SG3s from both factories and wouldn't hesitate to buy a Mexican-made version - particularly not if it's an actual NOS model. It's an excellent standard to use regardless of its origin, one that I prefer to the Linea 98 in terms of performance. However, from a purely aesthetic perspective I'd much rather spend time looking at the Linea.

The differences between German and Mexican versions were summed up by thetypewriterman in a previous post:

...the cast alloy side frames with (replaced with) stamped metal plates.  This actually made the machine more difficult to clean in the field.  You could easily insert a long typewriter cleaning brush through the gaps in the cast sides, but not through the stamped ones.  The stamped plates were on the last of the German-produced machines.  This problem solved itself when production switched to Mexico for the final few years.  Although more plastic internal parts appeared, the original-style cast side frames re-appeared.  Thank goodness!  Typewriter engineers and conscientious typists could once more get into the sides of the machine to give it a good clean!

I was reading the SG3 owners manual and asked myself a question.

It is recommended to lubricate the machine in moving points, with the exception of the segment, typebar, and line spacing wheel.

I knew that the oil should not be placed in the segment because when it makes the typebar gummy, but I thought that the escapement wheel had to be lubricated. How come you don't have to lubricate it?

Thank you very much!
I confudes the two wheel!

The best oil to use is sewing machine oil, which is practically the same as typewriter oil.  You can also use 0W synthetic motor oil, which is thin enough to not cause any problems.  Oil sparingly, very little oil is needed.  You probably won't need to use grease anywhere.