it's okay for a while. TM guns come well lubricated out of the box.
Gears use grease, not oil. If it's non upgraded, your gearbox is good for 10s of thousands of rounds without requiring a cleaning/re-lube unless something grinds/strips.
barrels, I clean after every game. It's good to get a layer of silicone in there as the brass can oxidize and get a rough surface if not maintained.
Typically 10 or 20 weight is good enough for your needs.
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