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Old 11-12-2013, 10:17 PM
sjessen sjessen is online now
LawnSite Silver Member
Join Date: Jul 2004
Location: Knoxville, Tn
Posts: 2,175
Can't answer that Larry. Here is what the dealer has said: Mobil 1 was used exclusively until Exmark began experiencing a higher than acceptable failure rate in hydro components. What they found was that Mobil had changes the formulation of their oil. Exmark/Toro then had oil formulated to provide greater protection at higher temperatures.

Your dealer should be able to address the veracity of this.
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