How to select a vacuum pump for the oil and gas recovery unit? Recommended manufacturers?

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Hello everyone. Our company currently has an oil and gas recovery unit used for loading gasoline at petrochemical plants. This unit is equipped with a vacuum pump of a certain Korean brand. Recently, we have frequently noticed that the lubricating grease in the bearings on the non-driving side becomes emulsified, and over time the grease disappears altogether. Now our company wants to add a spare pump (preferably one of domestic manufacture, as it’s more convenient to get after-sales support and spare parts for imported pumps). Have you encountered a similar situation? How did you resolve it, or could you help analyze the reasons? Lip seals are used on the non-driving side, and the bearings are lubricated with grease. I also have colleagues who are asking for recommendations on some device manufacturers with good performance; thank you so much! What is the common lubrication method used for the non-driving end of such pumps in the industry? Grease lubrication or oil lubrication? A high score reward is guaranteed. :)