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More than 90% of the oil leakage problem is because the rubber seal inside the gearbox has been alternating between cold and warm temperatures for a long time, resulting in the loss of a large number of plasticizers and softeners in the sealing ring, and the problem of corrosion, aging and hardening.
How to judge this, it's hard to say.
The smoke pipes are leaking oil, and I don't hurry up to replace them with new ones, which are not combustible, and are easy to catch fire, look at my avatar and the name of my online store, and I have aluminum foil pipe pipes in my store, which are fireproof and flame retardant, beautiful and generous.
You can use a range hood with a large exhaust air, if you have more stoves in your store, you can find a worker to make a large exhaust for you, and install more exhaust outlets for each exhaust outlet to solve the problem.
It's not going to be there, but you're going to clean it.
Open and check to replace the seal and also see if it is flat when installed.