Synthetic Oil
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More Turbo
Joined: Mar 2010
Posts: 609
Likes: 6
From: Apopka, FL
Synthetic Oil
Hey 7.3 owners,
What is your opinion on using synthetic oil over dino oil?
The reason I am asking, I am considering changing over to sythetic in my 7.3 Ex with 309,000 miles.
What are the opinions? good or bad?
I dont have any history on the EX. I purchased it about 1.5 years ago with 285,000 miles and change the oil every 5,000 miles.
Thanks for the ideas.
What is your opinion on using synthetic oil over dino oil?
The reason I am asking, I am considering changing over to sythetic in my 7.3 Ex with 309,000 miles.
What are the opinions? good or bad?
I dont have any history on the EX. I purchased it about 1.5 years ago with 285,000 miles and change the oil every 5,000 miles.
Thanks for the ideas.
Postmaster
Joined: Jan 2009
Posts: 2,667
Likes: 1
From: Glen Rose,Texas
You can get all kinds of opinions on this and discussion threads.Either oil type is fine if you want to try synthetic and can afford the price go for it.If you stay with 15-40 you will still be fine.
I have never tried synthetic in mine,mainly because of the price.
I have never tried synthetic in mine,mainly because of the price.
Senior User
Joined: May 2011
Posts: 223
Likes: 0
From: West ID
Down there in Florida I'd just stick with dino 15w40. If you have tired injectors it can help, a lot of guys run Rotella T6 or Mobil 1 TDT, but strictly from a temperature standpoint, you should be just fine with 15w40 year-round down in warm weather country.
Cargo Master
Joined: Mar 2008
Posts: 2,975
Likes: 19
From: Archdale,N.C.
I switched to Rotella synthetic at about 175,xxx and my truck loves it.Definitely better cold starts,but it runs smoother/a little quieter all around,and yep tired injectors will love it,and also after switching it never developed any leaks. You can also go a little longer between oil changes,but I wouldn't do that unless you start getting an oil analysis,I just sent my first sample in.
Logistics Pro
Joined: May 2011
Posts: 4,832
Likes: 668
From: Maine
Synthetic oil is better, hands down, as long as it's rated for your engine. Easier cold starts, last longer, less sheering, protects better...just plain old better. 
And take advantage of oil analysis, if you are interested in extended runs. I have a fumoto valve so I can take sample without removing the drain plug. Send my samples into Blackstone Labs and they analyze the oil, let you know what they find, what it means, and how much life is left in your oil.
And take advantage of oil analysis, if you are interested in extended runs. I have a fumoto valve so I can take sample without removing the drain plug. Send my samples into Blackstone Labs and they analyze the oil, let you know what they find, what it means, and how much life is left in your oil.
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Senior User
Joined: Jan 2011
Posts: 362
Likes: 0
From: SF Bay, CA
I also just switched from regular Rotella 15/50 to Rotella T6 5/40 synthetic. The motor does feel smoother and seems quieter.
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Cargo Master
Joined: Jul 2011
Posts: 2,670
Likes: 974
From: Walpole, MA
IMHO the biggest advantages to synthetics are the cold flow properties. If you live in a part of the coutry where day time highs don't drop below 40 or 50 degrees then synthetic might be overkill.
Senior User
Joined: May 2011
Posts: 223
Likes: 0
From: West ID
It will be expensive, but you don't have to stick with Amsoil. You can use any good diesel oil and keep trucking, maybe give Rotella T6 a try if you want to stay synthetic, it's fairly inexpensive and very easy to find. Works great in our trucks too.
Senior User
Joined: Oct 2011
Posts: 398
Likes: 7
From: Nova Scotia, Canada
How many miles between oil changes on "good" diesel oil versus synthetic?
More Turbo
Joined: Jan 2006
Posts: 687
Likes: 15
From: Lake Charles, LA
Depends on how you use your truck. I am mainly on the highway about 70% and 30% city driving and seldom offroad for about 25k a year, Ive have been going 10-12k miles between oil changes for about 4 yrs, backed up by UOA from Blackstone. Have since installed bypass filtration hoping to make it longer. I you do more city driving vs highway or get offroad in dusty conditions alot, it will most likely not be able to make this long an interval.
Senior User
Joined: May 2011
Posts: 223
Likes: 0
From: West ID
5,000 miles on dino Rotella or Delo are what almost everyone does, more if you use synthetic T6 or TDT (or similar). I'd probably stick with 6k on T6 personally becuase we have a ton of moisture in the air here and some of the nation's worst traffic on the freeways.
Cargo Master
Joined: Jul 2011
Posts: 2,670
Likes: 974
From: Walpole, MA
Only a UOA could tell you. I would be willing to bet you could get 7500-10,000 miles on a brand name dino oil.
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