Having just picked up a 1972 Mercedes Benz 220D with some running and drivablity problems I thought I had my shop booked for work for a while. Before I addressed any of the running issues I needed to get it to a baseline. If you try to tune or diagnose with deposits and possibly heavy deposits you are fighting a losing battle. With the injectors not spraying accurately due to deposits you will never get it to run even and smooth. With varnish and gum built up in the injection pump fuel delivery and timing adjustments aren't going to be made accurately(Ford IDI Diesel is one of the worse I've seen when gummed).
What I have been recommending is running a tank of fuel with BG 244 added to clean the deposits in the injectors and injection pump. If it's a customers vehicle and you don't have the opportunity to put some miles on the vehicle to utilize the 244 you can get the baseline established with performing the Diesel Injection service in a short amount of time with the vehicle never leaving the lot.
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Once the fuel side is cleaned up and working as well as it can you then proceed to the oil side of things. For trucks the kit to use is the very popular 6575K(BG 109 and BG DOC in 32oz bottles) but for passenger cars like the Mercedes and VW diesels as well as anything that has less than about 6qt oil capacity the 6573K is the way to go. Its the same kit as the 6575K but in the 11oz cans. The 109 will restore lost compression from oil deposits built up onto the rings as well as glazed cylinder walls. This can usually be verified by looking at cylinder balance rates with the scan tool. No scan tool to use on the vintage Benz but the start time has been drastically reduced. This old diesel whipper starts up almost as quick as anything gas powered and still under warranty.
In closing if you need to baseline a diesel, address the fuel with either an injection service or BG 244 and do your oil change with BG 109 and BG DOC. You might end up like I did and end up with a very good running vehicle without needing to make a repair. I did have to adjust the idle down a bit post 109 oil service.
Currently two shops in Portland and a shop in Vancouver are familiar with doing the diesel oil services on passenger cars and stock the kits.
The base lining also works for gasoline vehicles. The comperable products would be BG 44K and BG 6560K(Bg 109 and Bg Moa)
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