Posted by MarkB_MI on July 09, 2019 at 03:31:39 from (174.230.53.91):
In Reply to: Tractor Motor Oil posted by edw on July 08, 2019 at 15:21:39:
You don't say if your tractor is gasoline or diesel. Based on the SE oil spec, I'll assume it's a gasser.
The newer oil specifications are supposed to supersede the old ones. So the current SN spec oil should be fine. Many of the diesel oils also carry gasoline ratings (e.g. SJ, SK, SM or SN), so they should be fine as well. But not all diesel oils carry gasoline ratings, so you should check the label first. Will the oils that don't carry gasoline ratings hurt your engine? Probably not; one reason the diesel oils don't carry gasoline ratings is they have more zinc than the gas-rated oils. That's because zinc tends to wear out catalytic converters, which your tractor doesn't have.
As for running 15W-40, that should be fine, unless you want your tractor to start easily in sub-zero temperatures. If that's the case, I'd suggest using something thinner, such as 10W-40, 10W-30 or even 5W-40.
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