Posted by J Hamilton on April 20, 2020 at 11:48:59 from (174.255.2.110):
What grade (weight) engine oil is everyone using in their older 30's 40's 50's (classic) tractors. I know originally they didn't have multi grade oils and used a straight weight oil. I've read many people are using 15W-40 or 20W-50. What are the advantages or disadvantages of multi grade oil in these machines? I've been using SAE 30 in all of mine and they are still working tractors, not just for show or light work. They still do their part, plowing, disking, and haying. So they see several hours of work on a regular basis. Would I be better off using a multi grade oil or just stay with good ol 30 weight?
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