Baldwin is a very well trusted filter in industry and heavy equipment. Baldwin is owned by Clarcor which also makes the identical Hastings filters. They also make the Amsoil filters, but Baldwin won't say what is different about the filters they label for Amsoil, and Amsoil just says, "trust us," and displays non-industry standard testing.
I feel that Baldwin is top quality construction and average filtration--I got this filtration info directly from a Baldwin tech rep. I think the Purolator Premium is equal filtering and the Pure One is better filtration. I agree that the stock filters seem small, but they filter fine for the life of the oil--I haven't seen any evidence that the small filters are inadequate, just guesswork. Oversized filters often have different characteristics and we do not know if they meet all the engine designers requirements.
Ken
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