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Old 01-28-2009, 07:11 AM
dave29989
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time for a oil change in my 2002 ctd 4x4 170000 miles on her trying to figure out what kind of oil to use she has 170000 and i heard it wasent good to switch it to syentihec with all the miles on it so i have so oil brands let me know what u guys/girls think i should use and chime in with other brand if u have any (amalie xlo 15-40) (rotella T 15-40) (delo 15-40) (napa auto 15-40)
 
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Old 01-28-2009, 03:38 PM
92oilburner
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I use Rotella, but you can use synthetic if you want to spend the money
 
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Old 01-28-2009, 09:13 PM
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I use Rotella. Most of my buddies use Rotella as well.
 
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Old 01-28-2009, 10:13 PM
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I run Valvoline Premium Blue. Switching to synthetic wont hurt anything
 
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Old 01-28-2009, 11:15 PM
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Rumor was that conventional oil would make the seals/gaskets swell and the synthetic would let them shrink back up causing leaks. If this is true on the CTD, I don'tnow.
 
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Old 01-30-2009, 10:06 PM
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No, it wont do anything to gaskets or anything. Its perfectly safe to use...both on a showroom stock vehicle with 0 miles and one thats pushing 300k miles. Gas or diesel
 
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Old 02-01-2009, 09:04 AM
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so it is ok to switch to syenthic i was asking because i have always used rotella 15-40 sence i got the truck off the showroom floor but she is getting up in the miles so i wanted to run somthing better like ams or somthing
 
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Old 02-01-2009, 10:02 PM
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Originally Posted by dave29989 View Post
so it is ok to switch to syenthic i was asking because i have always used rotella 15-40 sence i got the truck off the showroom floor but she is getting up in the miles so i wanted to run somthing better like ams or somthing
Yes. Its ok to switch to synthetic. Amsoil makes some pretty good stuff, I run their ATF in my trans
 
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Old 02-06-2009, 10:11 AM
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I noticed yesterday at the store rotella makes a synthetic now. Is it ok to switch from the 15-40 to their 5w 40 sythetic on a 5.9? Or is the the newer sythetic just for the 6.7?
 
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Old 02-08-2009, 09:51 PM
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Been using shell rotella T 5w40 for the last 3yrs. shell has now made available CJ+4 which is backwards engineered for the older CI-4. The CJ+4 is meant for the new fangled emission controlled engines. It can be used in the older engines without concerns. I use the 5w40 yr round from +30 deg C to -45 deg C, never had any problems starting in real cold weather. I also pull 10k lb equipment trailer for business and summer time pulling 9k lb TT.

If your still concerned about engine oils I suggest checking out www.bobistheoilguy.com some good reading and info on his site, knows what hes talking about!
 

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