Your question could have a 100 answers.
What did Ferguson require when it was build. I would venture a guess
and say 30 wt in summer and 10 in winter, as most vintage tractors of the era required.
Oils have gotten better, I use 10w30 have had great results with Shell rotella,
also good results with valvoline, quaker, and plain old good Motomaster from
Canadian Tire-which for a long time was Quaker. I buy a couple of jugs when they are on sale.
Major brands are competitive both in quality and price.
 
oil filter might be under the large round cover on the oil pan and looks like a roll of toilet paper in a metal cage.
I run 15/40 in the '50 TO-20. Heavy duty oils are designed to leave a film behind, most modern oils are designed to drain away which results in higher fuel mileage and possibly dry starts unless your running a roller cam. Roller cams are much more tolerant of a dry start. I suspect your machine is a flat tappet machine and might be happier with a heavy duty oil.
 
15w-40 diesel engine oil.

Diesel oil is a better blend for the old flat tappet, non emission engines than modern gas oil which is now designed for roller cams, complex cam timing features, and emission systems.
 
Yepper, Kris nailed it, a hundred and one different answers, most all based opinions. SAE-30 is fine - these low compression engines don't need TLC, any special oil, will run on practically anything. Modern day oils contain detergents which, I suppose, help clean internally (how do you prove that?) but bottom line is whatever YOU want to use is OK -your tractor, your time and money, your call. BTW: My research years ago stated that the SAE 20 and 30 oils sold today are made from used oil. Whatever you use, always check it at every start up -should be top priority on your SOP PM schedule list before firing up tractor. A worn engine will affect oil use and and should be watched close. Oil pressure will drop as engine gets warm and even more with a worn engine. If oil drops below 10 PSI or lower at idle, getting close to damaging the engine.


Tim Daley(MI)
 
For a UK built TEA 20 in average condition 15w40 multigrade engine oil is the best option . The same oil can be used in the rear lift / transmission and the front hubs . This was an intention design feature meant to simplify servicing by farmer/ owners .
The oil filter is inside a cannister on the left hand side of the engine . The top houses an oil pressure relief valve , adjusting this can raise or lower the oil pressure delivered to the engine simply rotating it a few turns either way . The filter is easily removed by undoing the large bolt sticking out of the top lid .
The filter element kit comes with various seals , not all of them are used as it is a generic kit made for multiple tractors . The cannister sealing ring is the main one , make sure the old one is removed from the groove in the lid first .
It is very easy to mistakenly throw away part no 21, the large washer like plate that sits under the filter , it sticks to the element , be careful not to do this .

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This post was edited by Charles in Aus. on 09/11/2022 at 02:29 pm.
 

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