Posted by Steve@Advance on January 17, 2020 at 17:04:29 from (66.169.147.211):
In Reply to: diesel oil posted by Dim on January 17, 2020 at 15:15:49:
Your first source of information should be the owners manual. If no owners manual, you can get one online. If it's an older tractor, the general go-to oil is 15w-40 diesel oil. If in very cold climate, drop to a lower viscosity.
When looking for diesel oil, start with the stand by brands, Dello, Rotella, Delvac, etc. There are others, there are different varieties, straight petroleum, synthetic blends, pure synthetic. It's your choice, all will work. Probably a good idea not to mix them, or switch brands or blends. Find one and stick with it.
Then for the final decision, look for the "API SERVICE" circle.
That is where the owners manual comes in handy. It will list the minimum oil requirements for that engine.
On the top of the circle there will be a 2 letter suffix, sometimes followed by a number.
The first letter you want to see is a "C". That designates the oil is for a "compression ignition" (diesel) engine, if there is an "S", that oil is rated for a "spark ignition" (gasoline, LP, CNG) engine.
The second letter, and possibly a number, will designate the additive package in the oil.
The letters are always increasing in alphabetical order as the older products become obsolete. If your manual says "CH", then anything with an H, I, J, K... will work. Just don't go down in the letter rating, and the only way that would happen would be to find some old stock, as the old designations become obsolete and go out of production.
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