[AT] Engine oil

[Cecil Bearden]

John I don't know what part of the country you are in, but here in hot 
and humid Oklahoma, I use straight wt oils in everything built before 
2000, and multigrade for the rest.  I studied this a ferw years ago and 
what I learned was that multi grade is oil that has the wt of the lower 
number with viscosity improversto make it test to the upper wt when 
hot.  However, our older engines don't run as hot as these later 
models.  The difference between 170 degrees and 200 is a lot when using 
multigrade oils.   I changed the oil in my Ingersoll 250 cfm compressor 
w/ 3/71 Detroit.  I used 15W50 Mystic, I have used this brand for 
years.  It was ok in the winter, but when it was 90degrees outside, It 
started knocking at idle, I couldn't hear it when running at load, so no 
telling how much damage it may have done.  I replaced it with 40wt and 2 
qts of Lucas oil and it sounds ok now.  Still starts in winter too.   I 
think that if the water temp runs at 170, then straight wt oils are to 
be used.  If ti is hotter than multigrade.  Here in the hot south, 10W 
oils are just too thin to start with..
Cecil



On 8/15/2020 11:57 AM, John Hall wrote:
> What this group needs (in my opinion) is a good farm equipment 
> discussion.
> Engine Oil--but wait, this isn't your ordinary oil discussion!!! Long 
> story short, I have a fleet of old gas powered working FARM 
> equipment--not talking about lawn equipment. We have always ran big 
> name brand oil. I switched from Exxon Super HDII about 3-4 years ago 
> because it was getting really hard to source. I switched over to 
> Chevron Dello 400 (both are 30W). The Dello is formulated for diesels, 
> but supposedly works in older gas engines. I now have 2 engines that 
> drink oil when being worked hard. My Farmall M can drop 2-3 qts in a 
> couple hours of pulling a cultimulcher--yet you don't really notice it 
> smoking. It does foul plugs. That work is a very heavy load. Also I 
> have a 3300 Deere combine that will drop a qt or so every truckload of 
> corn. Now I've only had this combine about 8 years and the oil 
> consumption just started about 3 years ago--I swear some days it is 
> worse than others. I really wonder if its the oil I'm using. I have on 
> hand some CaseIH low-ash oil I run in lawnmowers--considering putting 
> it in the combine for this fall. Supposedly the same stuff IH has been 
> selling for 40+ years. The cost is about $3-4 more a quart, so an 
> extra $25 to change oil. For the record, the rest of the gas powered 
> fleet doesn't run hard/long enough to notice a problem. The combine is 
> such a gas hog, can't help but wonder if its a fuel issue causing 
> dilution.
>
> What you guys think, worth a shot?
>
> John Hall
>
>
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