SynthOil is I think 4200 for 4 Lit pack. Injection Cleaner additive is of 600 and good for mixing with 70 Litres of petrol.
You can use MoS2 oil additive with any brand of oil you are using for extra protection with Liqui Moly's patent MoS2 technology.
If the gear box is fine and Clutch plates working correctly, then anti-friction additive can make softness in gear shifting to somewhat. But if the gears are worn out then not much can be done. MoS2 Gear Oil additive is much sort of a protective thing for gear shifting for minimizing the breakdown and giving smooth and low friction operation.
In your 2007 Vitz, driven under 30K kms, you can use both LM SynthOil and LM MoS2 LeitchLauf Oil, its your choice. One is fully synthetic and other is semi-syth with blended MoS2 protection.