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not very efficient to have 2 skus that are basically the same. Even price is the same if Im not mistaken.

thanks for the reply. I have a 2020 Lexus 450h and when I type the vin into lexus parts, it gives me the A1 filter. When I visit a dealer to buy filters, the dealer gives me A3 filter. Are the interchangeable? should i switch it immediately?

Hi Guys, Ive been looking up these 2 filters and trying to figure are there any differences to them. Some suggested one have an extra O ring, and then others says the A3 is a newer revision of the A1. Anyone know if there is actually any physical differences to these 2? differences in quality...