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I have a 2004 Super Z, a past thread describes a new hydro oil requirement of 20w50 without Lubrizol. Does this apply to our older mower? Is there a factory service bulletin that we can obtain a copy of ? We just changed the oil and filter, 10w40 with lubrizol, will this damage the hydro system ? Thanks for your reply.
 

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This applies to all Hustler Z's and Super Z's regardless of when we built them, going all the way back to 1999.
There is nothing wrong with using the 10w40 with Lubrizol we have just made a running change, it in no way will damage the hydro system.

Pj
 
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