Can I simply refill the lubricant tank or do I have to change the lubricant?

Under no circumstances can refilling the lubricant tank replace a full lubricant change since it does not completely regenerate it. The fact is that, with use, the lubricant is degraded and loses effectiveness. Once its lifetime has been exceeded, its qualities become altered and protection of the engine elements is no longer guaranteed. Therefore, it is necessary to renew the oil on a regular basis.