Fuchs Titan Race Syn 5 75w90

Fuchs Titan Syn 75w90 Semi-Synthetic

Fuchs Titan Sintapoid SAE 75w90

What's the sintapoid stuff all about?

Has anybody had any previous experience of using any of these in their manual 200sx?

Basically I'm on a quest to cure a notchy gearbox and I cannot for the life of me acquire any "genuine Nissan" stuff.