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Motor oil weight

A

abane

Member
What is the correct weight motor oil for an 8N Ford tractor and will lesser weight oils ruin the motor.
 
According to the manual if the temperature is below 10 degrees use 10 weight. When the temperature is between 10 and 90 use 20 weight oil. Above 90 degrees use 30 weight oil. Of course when they make the tractor multi grade oils didn't exist but the temperature guide should give you an idea of which oil.
 
age old question as old as tractors/engines have been in existance. you will get as many answers as responders,as there is no 'correct' answer.I run 15/40 fleet diesel in my 8N,the same oil as I run all my other(gas/diesel)tractors;combines;grain trucks;cars/pickups;ATV;lawn mowers.....One oil for all. Keep it simple. So,you can run 'my' oil,10/30,or whatever. The same oil as you run in your pickup.Even todays 'worst' oils are much better that the 'best' oils of the 8Ns day.Even brand doesnt really matter.Multi-viscosity oils did not exist in 'the day'.Keep it clean,change it at least yearly and you will be fine. Keep it simple.
 

unless your in the artic,,, I would run the 15w-40 hd diesel oil, as it has many more additives to help the tractor through its life. These oils were not available in the 40s, 50s, and 60s.
 
Rotella 15w-40 year around. That's what I run in my Jubilee and very happy with it.

Disreguard what it says in the manual. That is was based on oil technology in the 40's & 50's.
 
15 W 40 diesel oil with the higher Zinc content for the flat tappet engines is needed or add a Zinc additive if you don't want to ruin your engine.
 
A 15 wt oil is pretty darn thick in zero weather. Also, oil wt's have a pretty large range they can fall in for a min and max viscosity readings. . Your multi grade oils will usually fall in the higher end (thicker) on the low number and on the lower end (thinner) on the high number. Meaning measuring how long it takes for a specific amount of oil to pass through an specific sized orifice at a given temp.

Put a jug of 15 40 in the deep freeze along side a 10 wt oil and see which one you can pour out of the spout. Might be fine, might not .

Also, back in 1954 I used Skelly Supreme number 1 which was a (believe it or not) 10w-30 in my 37' Ford car. Went to Skelly Supreme number 0 in winter. Multi grade oil has been around a long, long time. Improved, changed of course, but it has been here.
 
Multi weight oil is not magic it is 15 weight a certain temperature and 40 weight at another temperature. When you send an oil analysis in it tell you what viscosity the oil is at a certain temperature I’ve never had one that didn’t pass the viscosity test even after 15,000 miles driving
 
A whole lot depends on where your at. I use 20W-50 in almost every engine I have but I am in Missouri where it is rare to have very many really cold days. Now if I was up in MN I'd probably use a 5W-30 oil
 
Old guy that lived up.the road when I was growing up put used oil from his truck in his N series Ford for years. He also used it for bar oil in his chainsaws.
 
On an old flathead engine like that pretty much any engine oil will work. 0w20 might hurt it if you hooked it to a plow and pulled it hard for several hours. 10W30 and "heavier" would probably be best. The huge tolerances an engine like that had when new much less after years of use would probably be best with 15W40 or 20W50. It would run fine with 0w20 but it would burn a lot of it.
 
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