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: Engine oil, what is best?????? bcrishon 12-18-2005, 06:21 PM Hello all, I am a new user to this site, and also a first time diesel owner. I have a 2004 Chevy Duramax with the LLY engine. I just bought it used and it has 30,000 miles on it. I was wondering if it would be a good idea to switch to synthetic oil or not!! If so, what brand is everyone recommend? I have a LS1 that I use Mobil One Delvac in and was thinking of using it here also. Let me know what your thought are!! Thanks for the help!! hamsalad 12-18-2005, 07:06 PM This topic has enough threads to fill the library of congress archives. Do a search and you will have more info about oil choices than you could ever imgaine. Congrats on the ride and welcome! FWIW: I use Shell Rotella Synthetic 5w-40 all year. Works great. Tugted 12-18-2005, 07:14 PM I use Shell Rotella 5w-40 syn as well. Go to walmart and buy the big jugs. jholly 12-18-2005, 07:16 PM as was said search. Key point that it has the CI-4 or CH-4 rating. If in doubt go to http://eolcs.api.org/ and check it out. They are all fine and work fine. Not sure one is the "best". Amsoil dealers are free to disagree. Jim DURAtotheMAX 12-18-2005, 07:16 PM Shell Rotella synthetic 5W-40 all year for me... DMAX KING 12-18-2005, 07:39 PM I have used Amsoil full synthetic since about 20,000 miles. I love it. RichLube 12-18-2005, 07:58 PM Amsoil 15w40 product code AME for me. STPETEBLUE 12-18-2005, 08:24 PM Hello all, I am a new user to this site, and also a first time diesel owner. I have a 2004 Chevy Duramax with the LLY engine. I just bought it used and it has 30,000 miles on it. I was wondering if it would be a good idea to switch to synthetic oil or not!! If so, what brand is everyone recommend? I have a LS1 that I use Mobil One Delvac in and was thinking of using it here also. Let me know what your thought are!! Thanks for the help!! :welcome2: Post pics and create a sig with info about your truck. Some of us (me) are real nosey here! killerbee 12-18-2005, 08:27 PM Figure out what temperature you will be running your oil, that will dictate the weight. As for grade, better not tow without synthetic, the oil is undercooled in this truck. jwfab1 12-18-2005, 08:32 PM Chevron Delo 400 15w-40. jkblacksheep 12-19-2005, 04:18 PM go to any truck stop in America and ask any trucker what they use. Shell rotella will likely be their answer. Almost any widely known oil will be just fine. your service interval is far more important than brand. find what works for you and stick with the same brand. Also, you arent going to wear out your truck any quicker using conventional oil vs synthetic. killerbee 12-19-2005, 04:38 PM No kidding? A member here recently measured oil temp at 340 degrees. Still think synthetic has no advantage? | ||