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Old 01-23-2015, 11:12 AM   #1
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Low sulfur diesel in older engine question

Has anyone had any problems using the newer low sulpher deisel in their older vehicles? I know the tractor trailers have to add DEF (deisel exhaust fuel) additive in the new trucks. I'm thinking of purchasing a 1985 with a GM 6.2L engine. Are there any additives required to use the new fuel in an older vehicles. What problems have been caused by this phenomenom?
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Old 01-23-2015, 11:17 AM   #2
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Maybe add 2 stroke oil in the fuel tank?
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Old 01-23-2015, 11:18 AM   #3
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Has anyone had any problems using the newer low sulpher deisel in their older vehicles? I know the tractor trailers have to add DEF (deisel exhaust fuel) additive in the new trucks. I'm thinking of purchasing a 1985 with a GM 6.2L engine. Are there any additives required to use the new fuel in an older vehicles. What problems have been caused by this phenomenom?

Get Diesel additive. There are several to chose from. The "new" diesel doesn't have the protection of the sulphur which the additive should help minimize injector and valve wear.
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Old 01-23-2015, 12:12 PM   #4
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a subject of great debate. Some recommend various additives, some use transmission fluid or 2 cycle oil. I personally don't use anything unless it is below zero. I have used a biocide in my 1973 backhoe, but only because it sits a lot.
My 99 Dodge Cummins was built before ULSD and I have never used any additives. Perhaps if I had, my injection pump wouldn't have worn out at only 458,000 miles.
I am not convinced they are worth the money, but if I were to use one it would be a commercial product.
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Old 01-23-2015, 12:25 PM   #5
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My Ford shop recommends using Stanadyne in my 7.3.
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Old 01-23-2015, 01:34 PM   #6
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My Ford shop recommends using Stanadyne in my 7.3.
x2, I get about .5 to 1 mpg better fuel economy, better cold starts, quieter running and less smoke.
Ultra low sulphur fuel won't hurt your old diesel.
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Old 01-23-2015, 01:51 PM   #7
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Has anyone had any problems using the newer low sulpher deisel in their older vehicles? I know the tractor trailers have to add DEF (deisel exhaust fuel) additive in the new trucks. I'm thinking of purchasing a 1985 with a GM 6.2L engine. Are there any additives required to use the new fuel in an older vehicles. What problems have been caused by this phenomenom?
You are only required to use DEF in EPA Tier 3 or higher engines— usually featuring common-rail fuel injection— but you can use ultra-low sulfur diesel (ULSD, <15ppm sulfur) in any diesel engine.

Besides, you don't have a choice. All road-use diesel sold in the United States must be ULSD. Some off-road vehicles are still allowed to use Low Sulfur Diesel (LSD, <500ppm sulfur, no relation to the psychedelic drug) so be wary of refueling in places that see a lot of tractors, combine harvesters, etc.— they may have a LSD pump that will do very bad things to ULSD-required vehicles.
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Old 01-23-2015, 02:44 PM   #8
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I lost 4mpg in my Dodge Cummins when the ULSD came out
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Old 01-23-2015, 02:51 PM   #9
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Be real sure that the engine is working very well when you purchase it. That was not one of GM's best designs, the 6.2 L diesel. My first one was well cared for, but still at 100 K it was totally worn out on the top end, and the engine had to be replaced with a factory crate engine.

The Standine injection pump system used on the 6.2 was marginal at best. A Raycor fuel filtering system goes a long ways to keeping it happy, but even then realize it is expensive to service and replace if needed.

Also be sure that if it has the THM 700 R4 tranny that it is working well. They were worse than the engine in those early years. I had two major rebuilds on mine, and finally took it out and put an old reliable THM 400 in.

Just realize that because it is a Diesel it is not always good. And GM has made some poor ones as well as some excellent ones. I put the 6.2 L into the marginal ones. And a 1985 is now 30 years old.

My opinions only, you understand. I did tow a lot with mine but not without issues.
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Old 01-23-2015, 02:58 PM   #10
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I lost 4mpg in my Dodge Cummins when the ULSD came out
This makes no sense to me....I'd look for another cause of reduced mileage. Sulfur doesn't affect mileage. It was just a natural "contaminate" in petroleum. It did have the benefit of helping with fuel system lubrication. But burning sulfur results in sulfur dioxide, and other sulfur compounds Usually referred to as sulfuric acid in "shop Jargon", out the tailpipe....a major cause of smog and acid rain.

Each time sulfur content was reduced, by EPA mandate, QUALITY fuel blenders added lubricants to the fuel stock. I have seen zero lack of lubrication issues in the field with LSD or ULSD.
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Old 01-23-2015, 03:44 PM   #11
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I use stanadyne lubrocity formula in mine; both RV and truck. It makes up for the low sulphur fuels today.


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Old 01-23-2015, 04:08 PM   #12
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This makes no sense to me....I'd look for another cause of reduced mileage. Sulfur doesn't affect mileage. It was just a natural "contaminate" in petroleum. It did have the benefit of helping with fuel system lubrication. But burning sulfur results in sulfur dioxide, and other sulfur compounds Usually referred to as sulfuric acid in "shop Jargon", out the tailpipe....a major cause of smog and acid rain.

Each time sulfur content was reduced, by EPA mandate, QUALITY fuel blenders added lubricants to the fuel stock. I have seen zero lack of lubrication issues in the field with LSD or ULSD.
Due to the additional refining, I would estimate the reduced energy content of ULSD at 1% or so. That could result in reduced mileage, but nothing like 4 mpg. The cetane number can be different, and that can have an effect, but again it is minimal. Personally, I would try a different fuel supplier if I saw that much difference.
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Old 01-23-2015, 04:10 PM   #13
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I lost 4mpg in my Dodge Cummins when the ULSD came out
I might have seen a 1 mpg drop on my 99 and can't even be sure on that. I have over 500,000 miles of fuel tracked in a spreadsheet
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Old 01-23-2015, 04:17 PM   #14
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I have had 2 6.2's an 82 and an 84. Both before they came out with any turbo charged versions.
While they always got me where I was going they were underpowered and also would make lots of black smoke at high altitudes out west.

The 82 was traded for the 84.The 84 died of a broken crank somewhere shy of 200k miles
I agree that it was a marginal engine at best.

The Cummins has proven to be bombproof.
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