From Dino to Syn
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Joined: May 2004
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From: Northern Utah
The general rule is 10,000 miles. I am planning to switch over at 15,000 miles and probably would have done it sooner (less miles) but coinciding my switch from 15W40 to 5W40 with the arrival of the Winter season/cold weather.
Last edited by utahtom; Sep 19, 2006 at 06:27 PM.
Junior User
Joined: Aug 2006
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utahtom: sorry to butt in... but I have a question... once you switch to syn at 15k, will you stick with the syn 5w40 during summer months... in other words... will you just use the 5w40 year round? All other opinions welcome.
Got Diesel?
Joined: Jan 2004
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Mobil and Rotella say "anytime is good" and no break-in is required.
Others say to wait.... so do what you think is best and I am with the "wait for at 10,000 miles (at least) group.
I use Rotella-Syn 5W-50 year round and all is well.
Here is a twist though.... the magazines I have read have stated that the new diesel oil spec of CJ4 is far superior than the current CI4+. I may actually switch back to Rotella dino oil in October when the new CJ4 spec is made available in gallons. Do a search for "CJ4 oil" and look at the current issue of "Diesel Power" Magazine for more info. The new oil spec of CJ4 is so much better than CI4+, that I am going back to CJ4 dino oil (until the synthetic version is made available).
Others say to wait.... so do what you think is best and I am with the "wait for at 10,000 miles (at least) group.
I use Rotella-Syn 5W-50 year round and all is well.
Here is a twist though.... the magazines I have read have stated that the new diesel oil spec of CJ4 is far superior than the current CI4+. I may actually switch back to Rotella dino oil in October when the new CJ4 spec is made available in gallons. Do a search for "CJ4 oil" and look at the current issue of "Diesel Power" Magazine for more info. The new oil spec of CJ4 is so much better than CI4+, that I am going back to CJ4 dino oil (until the synthetic version is made available).
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Joined: Sep 2003
Posts: 73
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From: LongLake Alberta
Thanks for the reply guy's, that is about the time line I was thinking about. I sold my 99 s/d 7.3 to my son with 350,000 still working like new. I have been using 0W40 syn
in that engine since 104,000 winter and summer and changed it every 10,000 km. It is a little more money, but you get what you pay for, and my tech says oil is the cheapest thing you can do to a diesel.
in that engine since 104,000 winter and summer and changed it every 10,000 km. It is a little more money, but you get what you pay for, and my tech says oil is the cheapest thing you can do to a diesel.
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Joined: May 2004
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From: Northern Utah
Originally Posted by dentaldave
utahtom: sorry to butt in... but I have a question... once you switch to syn at 15k, will you stick with the syn 5w40 during summer months... in other words... will you just use the 5w40 year round? All other opinions welcome.
FWIW: The latest DuraMax Owners Manual specifically does not recommend using 5W40 above 100 degrees. Instead, they recommend 15W40 which I find quite interesting. I have not read/seen any other differentiation (between the 2 weights) during high temp operation.
Last edited by utahtom; Sep 19, 2006 at 10:34 PM.
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Joined: Jan 2006
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From: Lowsyana
I've considered it many times, but since I keep my oil change intervals so close and my maintennce plan pays only for FORD DINO...I'll probably stick to it Dino and possibly add an OilGuard filter for more benefit. I believe that if you live in the colder climates that you may benefit from the synthetics especially in the winter for easier starts.
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