Diesel Purge Question

2

2002MK4

Veteran Member
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Jan 24, 2011
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Scarborough
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2002, 2003 Jetta TDI
Two parter actually...

1. MUST I replace the fuel filter when I run the diesel purge procedure and MUST I also conduct an oil change following the diesel purge?
2. Does diesel purge work and if so what will it help me achieve?
 
S

saucer

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Jun 4, 2010
Location
Fayetteville, AR
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2015 Passat SE
I cannot comment on the importance of #1, but I did change the oil and the filter when I ran a whole can of Lubro Molly about 500miles ago... just to be safe.

I will say though, with certainty, that the purge eliminated rough idling and improved the sound of my 02 Jetta with 151k on the clock. I would like to say it improved acceleration as well, but cannot provide dyno proof.
 
J

joseluis.17g

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Monterrey, Mexico
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2007 MKIV mexican Jetta 1.9 TDI
I don't think you need to change it, but it's really easy if you have done all the steps for the purge, save you the mess of do it everything again and just change it, and I don't think you need to change you oil, if any junk is getting ripped off by the purge, it should go to the exhaust.
The purge is a way of keeping the injector cleaner
 
Dieselducky

Dieselducky

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88 Jetta Diesel - 2000 Jetta TDI - 04 BMW M3 - 06 Kia Rio - F350 Superduty - 87 Buick GNX - Mobile Cranes
2002MK4 said:
Any evidence that that the purge improves MPGs?
Click to expand...
If it cleans your injectors why wouldn't it,you would get a better spray pattern
 
1854sailor

1854sailor

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Westerly, RI
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2002MK4 said:
Two parter actually...
1. MUST I replace the fuel filter when I run the diesel purge procedure and MUST I also conduct an oil change following the diesel purge?
2. Does diesel purge work and if so what will it help me achieve?
Click to expand...
1. No and No.
2. Yes, it will clean your IP, your injectors and smooth out your idle.

Just search the forums for Diesel Purge. Both of the methods that folks here use completely by-pass the fuel filter.
 
T

tditom

Top Post Dawg
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Sep 5, 2001
Location
Jackson, MI
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formerly: 2001 Golf GL, '97 Passat (RIP) '98 NB, '05 B5 sedan
1854sailor said:
1. No and No.
2. Yes, it will clean your IP, your injectors and smooth out your idle.

Just search the forums for Diesel Purge. Both of the methods that folks here use completely by-pass the fuel filter.
Click to expand...
I would not by-pass the fuel filter, but I don't think you need to change it when you do the procedure.

I would change oil after driving one tank of fuel. We count on our oil to go 10K mi. Burning something as potent as DP is bound to introduce something into the crankcase that may adversely interact with the oil additives.
 
1854sailor

1854sailor

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tditom said:
I would not by-pass the fuel filter, but I don't think you need to change it when you do the procedure.

I would change oil after driving one tank of fuel. We count on our oil to go 10K mi. Burning something as potent as DP is bound to introduce something into the crankcase that may adversely interact with the oil additives.
Click to expand...
Both set-ups visited on these forums by-pass the engine's fuel filter, BUT add a separate in-line filter in the DP supply hose.

I'm not sure how running on DP for 15 or 20 minutes will adversely effect the oil??
 
T

tditom

Top Post Dawg
Joined
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Location
Jackson, MI
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formerly: 2001 Golf GL, '97 Passat (RIP) '98 NB, '05 B5 sedan
Anything you inject/burn in the engine is going to impact the oil in the crankcase. We don't know how much. The additive pack in your oil allows you to run the 10K mi oil change interval. If you perform a Diesel Purge at the same time you do an oil change, then you don't know how much you are shortening the oils service life. I play it safe by performing the purge shortly before the oil change instead of right after or at the same time.

I also perform the DP by replacing the fuel tank with the can of purge. This way anything that might float into the open reservoir during the purge procedure is filtered out by the stock fuel filter.
 
T

tditom

Top Post Dawg
Joined
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Location
Jackson, MI
TDI
formerly: 2001 Golf GL, '97 Passat (RIP) '98 NB, '05 B5 sedan
saucer said:
... I have read of people burning half a can and pouring the other half in the tank...
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Pouring half the can into the tank is wasting much of the benefit of the DP.
 
1854sailor

1854sailor

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Westerly, RI
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tditom said:
...I also perform the DP by replacing the fuel tank with the can of purge. This way anything that might float into the open reservoir during the purge procedure is filtered out by the stock fuel filter...
Click to expand...
:confused:
 
T

tditom

Top Post Dawg
Joined
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Location
Jackson, MI
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formerly: 2001 Golf GL, '97 Passat (RIP) '98 NB, '05 B5 sedan
Tyler E said:
Here is a how to video I made for anyone who wants to see how the diesel purge is done :)
http://www.youtube.com/watch?v=iq_ZGh1KEec
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Nice video. Make sure you hose off any diesel or diesel purge you spill inside the engine compartment. that stuff will eat your coolant and other hoses. Best to just clamp those lines when you pull them off the filter to minimize the mess.
 
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