I am new to being a diesel owner and also new to this board. I am thinking about changing engine oil over to synthetic and I have noticed a lot of mentions of synthetic in the different posts. I only have 3600 miles on my 2001 3500HD and I have heard that I should not switch until 10-12K. Can any of you folks that have more experience with diesel engines and synthetic lubricants give a me a little advice. Let me know the pros and cons. Thanks for your help. Ray