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#1
10-07-2012, 12:17 AM
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alternative hydro filter
I have a gravely hd52 that i am going to do my first hydro oil change on. The filter # is 21545100 . does anyone know a cross reference filter that will fit it from an auto store. I usually use wix filters but cant get a cross reference. also it says use 20w50 motor oil with an sl api classification. Not quite sure what that means. I use rotella oil in all my motors, would that work?
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Gravely 36g Gravely zt 52hd echo srm230 trimmer stihl br550 blower Honda pole edger mtd edger 6x10 open trailer echo hc-150 honda walk behind 6x12 enclosed trailer 
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#2
10-07-2012, 12:44 AM
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The hydro system is one system I wouldn't play with..use the oil it says and the proper micron filter.
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#3
10-07-2012, 01:14 AM
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You should use 20w 50 motor oil in it. "SL" is just the API oil classification from about 2001 - 2004 or so. Today's oil is "SN" rated.
If the Rotella is 20w50 then use it. If it ain't, then don't use it. But, hey, it's your unit, put what ya want in it.
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" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!" ......AMF!
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