I just finished the first oil change on my 8n since I inherited it. It is showing 36xxx some odd hours. I have not started the tractor yet, but I was talking to a friend of mine about what type of oil to use. I filled it with 6 qts. of 10w30. He was telling me that they tractor likes plain 30 weight oil with out all of the detergents/additives of todays oils. Is he right? Should I drain this out and fill it with a different oil? If so where can I get the proper oil? He told me that the 10w30 would be fine but it may smoke a little. Can you guys give me some advice. Thanks.