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Old 11-26-2011, 02:49 PM   #15
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I use Castrol 15W-40. 73000 miles on a 05 2500HD. Change it when at 10-15% oil life left,usually around 7500 miles
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Old 11-26-2011, 06:18 PM   #16
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Rotella 15W40, DIC tells me when to change, per GM advice. 2002 Chevy D/A, 108,xxx miles. Have never needed to add oil between changes.
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Old 12-03-2011, 05:42 PM   #17
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Conklin 15-40 235,000 miles on 2500 Chevy Duromax
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Old 02-04-2012, 04:29 AM   #18
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Where do you get 15w-40 Shell Rotella synthetic. I would be in favor of using that then 5w- 40syn. I change every 6000 miles and it seems like a waste of the syn oil.
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Old 02-04-2012, 04:49 AM   #19
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When new I started using 15w-40 Rotella and then started using 5w-40 Rotella syn. Im just wondering being tht I change every 6000 miles if I would be better using nonsyn. or would it not be a good idea to go from syn to a nonsyn with 80000 on it
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Old 02-04-2012, 04:53 AM   #20
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It is a 2006 durmax
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Old 02-04-2012, 06:30 AM   #21
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I have a 2007 Duramax and use Shell Rotella 15w40. I change oil & filter every 5000 miles. I have 82,000 miles on the engine and am afraid to change to synthetic. Couldn't it cause problems? I guess I'm just old school, I've always heard you shouldn't change from what you have been using!!!!!

This is my first diesel, and it had 70,000 miles on it when I bought it. Another question I have is how often should you change your fuel filter? I've heard every other oil change or at 15,000 mile intervals.
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Old 02-04-2012, 08:18 AM   #22
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I change our fuel filter one time each year during the summer. truck sits all summer waiting for the tow south for 6 months. 6000 miles a year . I have cut and looked at the filter and 6000 miles shows me I would not go 15000 miles. I do the work so it is affordable for the job and makes me feel good towing our fifth. I carry all filters behind the rear seat.
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Old 02-04-2012, 08:57 AM   #23
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Thumbs up

forgot to say we use mobil 1 diesel synthetic engine oil.
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Old 02-04-2012, 02:21 PM   #24
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I use what was in it from the factory, Chevron DELO 400 15-40.
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Old 02-04-2012, 02:23 PM   #25
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Old 02-04-2012, 09:00 PM   #26
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what oil do you run in your Duramax

mobil 1 synthetic, change oil, filter and fuel filter every 5,000 mi, we have 73,000 mi on our 06 Duramax.
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Old 02-09-2012, 04:13 AM   #27
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I use Shell Rotella 5w-40 Syn it a 2006 Durmax with 80000 miles on it and I change every 6000 miles. the reason of this message is that I was wondering what or would it be a bad thing to change to shell rotella 15w-40. I started out using new 15w-40 and then switched to syn. around 30000 miles. Thanks for yor reply.
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Old 02-16-2012, 09:08 PM   #28
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Shell Rotella 15-40, '07 Duramax, 94,000 miles (just about all towing). Chage when the DIC is at 10% which is usually 8-9000 miles. Runs like a top.
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