Just seen this - maybe it will be helpful to someone.
Suzuki DF140 - RIBnet Forums
(If the link doesn't work, what it says is that owners of DF140s [& DF115s?] should check the oil cooler for corrosion as this can cause oil leaks into the cooling system...)
Suzuki DF140 - RIBnet Forums
(If the link doesn't work, what it says is that owners of DF140s [& DF115s?] should check the oil cooler for corrosion as this can cause oil leaks into the cooling system...)