Hi All, I'm totally new to this forum and I'm also totally new to the science of motor oil. So I apologize in advance if my questions are a little dumb! I've read some very good articles on breaking in my diesel and they sound very believable. Basically what the dealer tells you about 'take it and drive it' is total rubbish. From what I understand you should..Keep revs low and variable for the first 100miles. Continue to not thrash it and take it easy for 500 miles and only hook up the trailer after 1000 miles. But what I'm really interested in is when I should change the oil and which oil to use on this BRAND NEW truck? I've heard various stories from change it after the engine has turned over for a few minutes to change it at 100 or 500 or 3000. This is the first diesel engine that I have ever owned so from what I understand the break in period, initial engine oil changes etc are quite critical to the successful bedding in of the rings and the future wear of bearings and other engine parts. I live in San Diego which I would say is quite a temperate climate. By user manual says to use 13quarts of 10-30 diesel motor oil. To show my complete ignorance I don't even know what the difference is between diesel motor oil and gas engine oil! The expertise and wisdom from you experts would be greatly appreciated! I pickup me new Truck from the Dealer tomorrow afternoon Thanks in Advance for your help!