Silly question..maybe, but what Oil should be used during winter months for the D-17 and older models where they didn't have multi-viscosity oils when they were made? Should a streight weight still be used?

Thanks for the input! NExt question...what about non detergent vs detergent in a 1959 tractor? I went to buy some non deternat today because they say detergent can loosen crud and cause it to fail..instructions on the Non D oils says don't use on post 1930 vehicals! So what say you all?

My dad used chevron 10 w 30 in his wd A C from 48 to 53 or 54. When the dealer overhauled it they were surprised at the good condition of bearings and other internal parts. They had him bring his own oil to fill oil pan . They said oh no dont use that oil. when he told them that was all he had ever used they said o.k. this tractor was the best looking internaly they had ever seen so keep on using the same oil. They also said he was the only customer who bought oil filters by the six pack. That tractor had full load on it either on p.t.o. or heavy plowing . All full throttle no light duty jobs. He used that same oil in 37 WC 2 WDs and 2 WD45s only customer to need the governor weights and bearings rebuilt. They said he probably had more full load hours on that tractor than other farmers in our area. I am also using 10w30 in my 40 WC parade and pulling tractor. Use your brand of multi-grade oil and change regularly and you should be pleased. Best wishes. dan wc ne wyo.

use 10w 30 year round, just like your truck. if they had multiviscosity 50 years ago, they would have use it.

A manual is good, I agree, but that's not the question. I have many tractors but the one's (gas) I run in the winter have 5w-30 oil in them. Have done it for years, and never had any trouble. Hope this helps. P.S. One of them was a D-17 A.C.

Sounds like you don't have the OPERATOR manual- all that and more is in it. First basic purchase after ANY tractor!