①, ②, and ③ are all brand new original oil pumps for the 13-liter engine ④ is an imported brand new oil pump.
① is the oldest model of the 13-liter oil pump. The oil relief valve plug is made with a one-piece casting, ensuring no safety hazards during use.
② is the new model of the 13-liter oil pump. The oil relief valve plug is secured with rivets, which presents a certain safety hazard during use.
③ is the latest model of the 13-liter oil pump. The oil relief valve plug is secured with screws, ensuring no safety hazards during use.
④ is an imported brand new oil pump. The oil relief valve plug is made with a one-piece casting, ensuring no safety hazards during use.
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