Has anyone developed a millage schedule for diesel purge?
I generally do my 1984 300D twice a year driving an average of 20,000 miles per year. Obviously with these cars engine health and fuel quality are going to play a big part in carbon build up. Sometimes I feel it could be
more frequent though.

i do it every 30,000 miles. just before an oil change and fuel filter change.

driving habits play the most part to carbon build up... but there shouldn't be any in the IP...
I think clean fuel tank, and constant minding of the prefilter is key to keeping the gunk out of the IP and the fuel system in general.
STARTON is your friend!
as is a FULL fuel tank as much as possible!

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Did my first diesel purge yesterday. 1984 300SD with 371,000 miles on the original engine. I was unimpressed with the purge. I didn't get much black fuel coming from the fuel return line and haven't noticed much change in power or smoke quantity, etc. The car has been well maintained which might make the difference. If in the first 15 years of your car's life, no one ever changed the fuel filters then maybe Diesel Purge is worth doing often, otherwise I am thinking every 5 years. Remember this procedure is not suggested by the manufacturer on any particular interval. Probably good to do every once in a while, but I would be careful to not go overboard.

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1984 300 SD 384,000 Miles

I remember reading posts by Marshall Booth where he said never to use diesel purge. A search should turn up his reasoning.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

I have yet to do a diesel purge.

I have had about twenty plus mb diesels plus nearly a dozen american made diesel suburbans and pickups.

Probably a million miles at least.

I try to buy fuel from reputable stations, keep the filters changed, and if any question will use some biocide.

It seems unneccessary to me and in fact a bad idea. If an engine is running fine cleaning things too much could potentially create leakage.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I ,frankly, think it's snake oil. Not harmful, just not very useful. Like trying to keep your teeth clean by using only Listerine instead of going to a dental hygienist for a brutal scraping. Need to yank 'em and give 'em a good scrub....

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)

I did it on the SD when I got it. It sat for long periods of time. It didnt do anything. The only thing that got the engine to sound better and run better was regular driving with some italian tuneups and maybe a good road trip.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

X2 on the snake oil theory and I also remember Marshall Booth's opinion which I respect.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

I NEVER used diesel purge in almost a million miles of driving 123 cars. I changed both filters every 25 k miles and that was it. Never any problems.

That said, my cars got driven regularly and got driven a LOT. I probably was really lucky on fuel during that period.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution

I used Lubri Moly Diesel Purge as a result of hammering/cackle. It did the trick for me. Just sayin'

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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi