[AT] Diesel rated oi/ Gasoline powered engine?

[Henry Miller]

Read closely, most diesel rated oils are rated up to sf or something like that. The s stands for spark ignition, and the f is the revision. If it has a s rating at all it is better for your engine than a more modern sj rating. Because of emissions Car engine manufacturers have been unable to get the older additives needed by your tractor to work and have had to change their bearings to get an oil that lubricates without destroying emissions. Diesel engines have different considerations and still have those additives. 

Bottom line, in all antique gas engines I start in the diesel oil section and then find one with a gas rating. 

-- 
  Henry Miller
  hank at millerfarm.com

On Sun, May 26, 2019, at 8:39 AM, Carl Gogol wrote:
> Without thinking, I just drained my "new" 1968 IH-140 and filled it with
> Rotella 15W-40 T4 Diesel rated oil.
> It is one of those "All Fleet" oils and I  was easily led astray by that
> slogan.  Of course I carefully read the label once the jug was empty.
> What would you do?  Drain and replace or leave it in and replace it next
> year?  Are the additives all that different?
> The IH 140 is an old state road clipper with a side mount "HydroClipper"
> sickle bar mower.  The engine sounds really tight and absent of any sounds
> common from a long used engine.  It will probably get less than 20 hours use
> in a year.
> Carl in rainy Mallkus NY
> 
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