Does Wynn's diesel injector cleaner really work? Actual scientific testing shows proof in the video that it works! This includes leak off test before and after the fuel treatment with the Wynn's diesel injector cleaner fuel additive.

Test of the Wynn's fuel system/injector cleaner in a turbo diesel 1.6HDi Peugeot Partner (2007; 90bhp; 105k miles), same as a Citroen Berlingo.
The tests comprise reading 3 times the leak-off of the injectors in the car when the fuel tank was nearly empty before pouring the Wynn's diesel injector cleaner. The car was also warmed before both tests. The 3 tests for each injector were done in a quick succession. Overall it takes me ~1.5h to do the 3 measurements for the 4 injectors. The Wynn's diesel injector cleaner was then added to the nearly empty fuel tank and filled with normal diesel. I drove 450 miles with the Wynn's diesel injector cleaner, mainly shorter journeys, but also some motorway as well (~30%) for about 1.5 months, so lots of stops and goes and sometimes the car stood not drive for a few days. The fuel tank was again nearly empty and I did the same 3 measurements of the fuel returned by the injectors. The idea is that if an injector is blocked it will return a lot of fuel back as compared to a normal (non-blocked) injector. Fuel is under pressure and a blocked injector will result in slightly more fuel returning than going through the injector. It is not entirely scientific method and it is a bit crude and there could be a lot of variability.
The video also shows how to perform a leak-off test or measure the return flow of the diesel from the injectors. Overall, one has to look for the variance between the injectors rather than some arbitrary constant return flow. There are some websites where it is stipulated that if the injectors are good if they return less than 25ml per min. I am not too sure about these values. After the test 3 of my injectors return less than 25ml per min. So, there might be some merit in this less than 25ml per min at idle.
Overall, the Wynn's diesel injector cleaner have cleaned all of the 4 injectors to some extent in my 1.6HDi. Overall, each injector returned ~6-7% less fuel per min, this is comparing before the Wynn's diesel injector cleaner and after. Before pouring the Wynn's I put 37L of diesel fuel in the tank and the tank was not entirely empty. Perhaps with less fuel, for example 20L, the results might have been better, but I intend to perform this again with less diesel in the tank.

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Wynn's diesel injector cleaner 325ml:
amazon (UK) https://amzn.to/2VdRfsS or ebay: https://ebay.us/gC59KE
Wynn's diesel injector cleaner 3x325ml (amazon UK): https://amzn.to/3Chrgl4 or ebay: https://ebay.us/FbKZhD
Fuel Flow Meter Leak Off Tester Kit (amazon UK): https://amzn.to/3rZ1mOL or ebay: https://ebay.us/uEkQwJ
BG 245 Diesel Cleaner 325ml (amazon UK): https://amzn.to/3b830ms or ebay: https://ebay.us/ryBYqt
Leak Off Fuel Pipe (amazon UK): https://amzn.to/3LEOMyZ or ebay: https://ebay.us/CCRda7
How to perform leak-off injector test (   • How to test injectors in 1.6HDi/TDCi ...  )
Previous test with the BG245 cleaner (   • Will BG245 clean the injectors in 1.6...  )

I ran a linear mixed-effects model in the R programming language to see if the result is simply due to chance. The results suggest that this is unlikely and the effect is pretty real (p-value 1e-09).

00:00 - 05:21 How the test works
05:21 - 07:28 What to use for injector leak off
07:28 - 09:10 How blocked are the injectors before Wynn's
09:10 - 11:12 A mistake when pouring Wynn's diesel injector cleaner
11:12 - 13:07 How good were the inejctors (after Wynn's)
13:07 - 16:51 Some observations and recap
16:51 - 20:22 Real effect from Wynn's
20:22 - 23:34 The evidence (graphs)
23:34 - 26:10 Conclusions

#HDi #InjectorCleaning #Wynns

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