Best oil in Zombie Turret Farm
The best oil in Zombie Turret Farm appears to be Rainbow Oil for top- end power, while Shiny Oil and Celestial are also strong picks depending on what you’re upgrading. One recent guide explicitly says, “go for the rainbow or hyper clock” if you’re very good at the game, and another gameplay clip says “Rainbow oil 100%” is the standout choice for boosting turrets.
What the oils seem to do
The game’s oils are used to improve turrets, so the main question is whether you want raw damage, better farming, or a cheaper upgrade path. Based on current player guides and clips, Rainbow Oil is treated as the premium option, while Shiny Oil is mentioned as an important shop upgrade and Celestial is described as a best-in-slot style turret tier in one guide.
Practical choice
If you want the simplest answer, use Rainbow Oil when you can afford it. It is the option most directly associated with maximizing turret performance in the material currently available.
If you are earlier in progression, Shiny Oil is likely the safer investment because it is referenced as a shop purchase and upgrade path rather than a late-game luxury.
What is still uncertain
There does not seem to be a single official, clearly documented oil tier list in the sources available here, so some of the “best” claims are coming from player guides and videos rather than a developer explanation. That means the meta may shift with updates, balance patches, or new oils being added.
Best answer
For most players, Rainbow Oil is the best oil in Zombie Turret Farm right now, with Shiny Oil as a strong practical upgrade and Celestial sitting among the top-tier references in current community guides.