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Old 11-14-2019, 07:55 PM
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The diesel lubricity additive study Diesel911 mentions and linked in the second post of this thread really is an eye opener. Click it and read.

My first diesel was a brand new '86 Jetta (non turbo). At the time I did a lot of work for Stanadyne (photography), they had a tremendous R&D Department with water dynamometers as far as the eye could see!
The engineers said they have patents on their Performance Formula diesel additive and "It is the best". I used it faithfully in that car until it completely rotted away at 350,000 miles on the original pump and injectors.

After reading the lubricity additive study a few years ago where Stanadyne Performance Formula scores well but not the best I switched to Opti Lube XPD and the Walmart 2-stroke oil in my Chevy 6.5 and '83 300CD. I'm happy using that double whammy additional lubrication to today's dry fuel.

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  #17  
Old 11-17-2019, 12:35 AM
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Quote:
Originally Posted by Alex E View Post
The diesel lubricity additive study Diesel911 mentions and linked in the second post of this thread really is an eye opener. Click it and read.

My first diesel was a brand new '86 Jetta (non turbo). At the time I did a lot of work for Stanadyne (photography), they had a tremendous R&D Department with water dynamometers as far as the eye could see!
The engineers said they have patents on their Performance Formula diesel additive and "It is the best". I used it faithfully in that car until it completely rotted away at 350,000 miles on the original pump and injectors.

After reading the lubricity additive study a few years ago where Stanadyne Performance Formula scores well but not the best I switched to Opti Lube XPD and the Walmart 2-stroke oil in my Chevy 6.5 and '83 300CD. I'm happy using that double whammy additional lubrication to today's dry fuel.
The lubrication issue is more important on the type of Injection Pump used on the Chevy. The Pump Housing is Aluminum and the advance piston and the cam ring that rotates when it advances and vibrates causing wear on the Aluminum housing.
I have seen some with a fibrous plastic advance piston but the majority have a steel advance piston riding on the Aluminum Housing.

A similar issue with VW Rabbit type Fuel Injection Pumps. The advance piston is not steel so it does not wear much there but again there is a steel ring that rides on the Aluminum housing.

I manly went to this site to copy the picture but it may be of interest: Stanadyne DB2 Fuel Injection Pump &raquo Motor Mayhem

In this picture you see a (Cam) Ring and the Advance Piston on the bottom. The Advance Piston or the Spring Pack (not shown) rotate the Cam Ring. Both ride on the Aluminum Housing.
http://www.motormayhem.net/wp-uploads/2009/10/IMAGE0024.JPG.jpg

Changes in the Diesel Fuel that removed the lubricating qualities accelerated wear on the Aluminum Housings. That is not much of an issue with the Big Rig Diesel Engines as they don't have advances or other parts that ride directly against Aluminum and are lubricated by only diesel fuel.

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