This may have been discussed in a previous thread that I missed, but are there any comments on the ultra low sulfur diesel in these old engines? Lubrication is the injector pump is, of course, the concern. We lost an injector pump in an Oliver 1650 tractor 10 or 12 years ago from using low sulfur diesel and the mechanic that rebuilt it recommend adding a quart or two of transmission fluid to each tank of fuel. We have also used Stanadyne additive in the diesel fuel in our old tractors, including our 5U series D 2.

As I understand it, diesel fuel had about 1/2% sulfur and the low sulfur fuel put on the market several years ago was 1/20% sulfur and the new ultra low sulfur fuel has been reduced to 1/700% sulfur. We haven't had to buy any diesel since last fall. Anyone have any thoughts on injector pump lubrication?

In georgia around the Atlanta area we us the low sulfur fuel and on the pump it states for all diesels , I use it in my 955 with no problem.

The less sulfur the better as that is the source for sulfuric acid which raises hell with engine internals. It was the loss of lubricity when they reformulated several years ago that was the most harmful.

OM is right, and the sulfur isn't the source of the lubricity. It's just that to refine the sulfur out, the lubricity is also removed. Most resellers will add a lubricity agent, but an ounce of prevention is worth a pound of cure.... A pump guy told me that the big issue was the seals in the pumps - Older seals couldn't take the transition to low sulfur a few years back - they had gotten hard(er) than they should have (presumably from the high sulfur fuel) and the low sulfur caused them to shrink. His theory was this would happen again with the ultra-low sulfur, but that newly rebuilt, or pumps built fo low sulfur would be OK.... Only pumps from before the low sulfur days would be at risk... I'm thinking that if you made it through the last changeover OK, you'll be OK again, but????

Rodney

For what it is worth, I have been using the Power Service Agri-Power in my old Cats and I have not had a lick of trouble.

powerservice.com/

Click on products, then by product name, and then on Agri-power + cetane boost.

Thank you for the information and clarification. I now understand it is in the refining process to remove the sulfur in diesel that cause loss of lubricity in the diesel.

"D4Jim" wrote:

For what it is worth, I have been using the Power Service Agri-Power in my old Cats and I have not had a lick of trouble.

powerservice.com/

Click on products, then by product name, and then on Agri-power + cetane boost.

What's the difference between the Agri-power & the "regular" (white jug) Powerservice?
& what kind of $$$ for the Agri-power?
Just wondering.