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Message: <blockquote data-quote="Thomastech" data-source="post: 20157" data-attributes="member: 2058"><p>WARNING! When cross referencing filters, you should make sure you know the specifications on the two filters. For example, Thomas use a 5 micron filter for the hydraulic oil and if you cross reference the numbers the Napa one is only a 10 micron which will not give you the proper protection for your system. Another thing to check is the make up of the filter element, there are different kinds such as paper, cellulose, and synthetic. You should not used a corrugated paper filter in a hydraulic as the paper may become damaged and plug the suction filter in the oil tank. If you are not using the proper filter for your system, you will void your warranty. Just remember because a filter looks the same on the outside, it doesn't mean it is the same on the inside, and it is what's inside that really counts.</p></blockquote><p></p>