[AT] Diesel rated oi/ Gasoline powered engine?

[Jim Becker]

There wasn’t much if any zinc additives in motor oil until the 1950s, probably late 50s.  Tractor engines had already been getting along fine without it.  The die-hards that insisted on non-detergent oil never had any zinc in their oil.  Honestly, anything you find today labeled “motor oil” will be better than that.

You should keep fairly close to the original viscosity recommendations.

Jim Becker

From: David Steinich 
Sent: Sunday, May 26, 2019 12:04 PM
To: Antique Tractor Email Discussion Group 
Subject: Re: [AT] Diesel rated oi/ Gasoline powered engine?

I've started using the Rotella T-4 15W-40 in all my tractors that I don't expect to work in the winter. Haven't been doing it long enough to see if there are any damaging effects though. I have read about the additives like Henry mentioned - specifically zinc and how it is bad for catalytic converters, but good for our old valve lifters. 
It's also a lot easier to just have two oils on the shelf.

Dave 

On Sun, May 26, 2019 at 11:50 AM Carl Gogol <cgogol1971 at gmail.com> wrote:

  Henry-
  Unfortunately, the oil I used is not rated S anything.  How does that change
  your answer?
  Carl

  -----Original Message-----
  From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Henry Miller
  Sent: Sunday, May 26, 2019 9:52 AM
  To: at at lists.antique-tractor.com
  Subject: Re: [AT] Diesel rated oi/ Gasoline powered engine?

  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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