Posted by LJD on November 12, 2011 at 18:19:41 from (67.142.130.44):
In Reply to: Diesel Fuel Additive posted by wolfman on November 12, 2011 at 17:25:04:
It's not a matter of "working" or "not working." It's a matter of shortening the overall life of mechanical rotary injection pumps that aren't used on newer vehicles. Many farm tractors though, as well as Chevy/GM SUVs and trucks, Ford trucks up to mid 1994, Dodge trucks with Bosch rotaries, etc.
If you have an in-line injection pump, it's not an issue. An in-line pump actually has a separate injection pump for each cylinder and no distributor to worry about. It is the distributor that causes the big problems with low-lube fuel.
The new fuel does not have the same lube as the old fuel did. When the sulfur is cooked out of it, lube is lost. As a result, lube additives are put back in before it gets to the pump, but that will vary and still does not bring the new fuel up to the same lube level of the past.
A well cared for mechanical rotary pump can last 1,000,000 miles. It may get sent back to the shop for so-called rebuilds 3-6 (more or less) times, but often all the major moving parts are use over again, as is.
So, I suspect most people will never know when their pump life was shortened - unless they know it's actually new inside and then goes bad in short order.
For a non-emissions car, truck, or diesel tractor using two-stroke-oil at a 1 to 400 ratio gets the lube up to where it ought to be and it's usually the cheapest/effective additive. I buy it in gallon jugs at Walmart. I only use it on my highway diesels. For my tractors, I use medium sulfur dyed off-road fuel that does not have the low-lube issues - yet. But I'm in NY. In some parts of the USA, dyed fuel is ultra-low and DOES have the issues.
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