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Old 04-21-2012, 06:01 AM
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conventional or synthetic oil ?

what are the benefits to using 5w 40 synthetic versus 15w 40 conventional oil?
i have always used 15w 40 rotella, oil and filter change every 3,000miles.
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Old 04-21-2012, 06:17 AM
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It flows better at cold temperatures, which is really nice for any HEUI diesel, but especially the 6.0.
You could do an oil change every 5k with 15W40 and 5W40 as well, but it won't hurt to do it every 3k at all.
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Old 04-21-2012, 07:15 AM
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If i do the switch to 5w40 synthetic, i would change it every 5,000 since it cost more.

Quote:
Originally Posted by jesilvas View Post
It flows better at cold temperatures, which is really nice for any HEUI diesel, but especially the 6.0.
You could do an oil change every 5k with 15W40 and 5W40 as well, but it won't hurt to do it every 3k at all.
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Old 04-21-2012, 01:01 PM
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There are a couple of advantages to synthetics. They flow better cold making cold starts easier. They handle heat much better than conventional oils so you are less likely to coke up the turbo bushings. They contain less "Aromatics" (read organic debris) than conventional oils therefore are far less prone to developing sludge or varnish. Varnish on injector spool valves is the leading cause of injector stiction and resultant injector replacement.

Do yourself and your truck a favor and switch to a 5w40 synthetic. Rotella T6 from Walmart is probably you cheapest option. I prefer Amsoil 5w40 personally.
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Old 04-22-2012, 11:55 AM
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I have ran 5w40 since the motor broke in at 20k. Now at 200k+ miles with 4200+ hours on a 2006 motor with the original injectors still going strong. Enough said.
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