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Old 10-07-2012, 01:17 AM
LawnSite Member
Join Date: Apr 2008
Location: springfield, ohio
Posts: 138
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?
Gravely 36g
Gravely zt 52hd
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Old 10-07-2012, 01:44 AM
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cgaengineer cgaengineer is offline
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Join Date: May 2007
Location: Winder, GA
Posts: 15,782
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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Old 10-07-2012, 02:14 AM
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BigFish BigFish is offline
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Join Date: Jul 2008
Location: chesapeake, va
Posts: 2,615
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.
It ain't rocket science! far.

'Course if yer house has more wheels than yer truck...
" Old age ain't for sissies "
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Old 10-11-2012, 06:56 PM
Oldtimer Oldtimer is offline
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Location: Pensacola, Florida
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Use the OEM hydro filter & I would use the eXmark hydro oil.

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Old 10-13-2012, 10:27 PM
mow4cash mow4cash is offline
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Join Date: Oct 2009
Location: Poughkeepsie, Ny
Posts: 101
I would use oem. I don't think you will be able to find a better filter aftermarket, let alone the correct specs.
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