Engine and APU Servicing Frequency

[Travon999]

Hello captains and technicians, 

I know that at my company, I see the engine oil on the A330s (RR) and A350s being topped up pretty often, but I'm guessing there's no way to top up the ini A300's oil without servicing the engine. Now obviously opening a side panel and topping up oil versus servicing an engine are different things, so my question is, how often is an engine serviced on the A300?

Also, on average how often is hydraulic fluid replenished?

Regards,

Travon Nicholls