I have my suspicions as well, Why put the latest and greatest, and take on the associated costs into many vehicles that may not need it. More than likely a run of the mill 5w-30, API SN put out by ExxonMobil. Attached is the photo of the tank. Looks like it has been in use for years.
Originally Posted by George Bynum
I'm bothered by the chemistry much more than the cleanliness. In industrial hydraulics, we've preached the lack of cleanliness of bulk oil. BUT, we typically pass a full reservoir through the pumps and filters multiple times an hour. Circulating at low pressures for a day or so will usually reach equilibrium established by the filter media. I certainly want to strain the oil through something that doesn't pass particles large enough to clog orifices or block sliding parts. Filling through a 15-25 micron nominal element is good enough to me. I'd bet that the bulk oil isn't Dexos 1 gen 2 ... that concerns me.