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Old 07-08-2015, 04:02 PM
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Bosch CP4.2 HPFP and lubricity...

So it looks like our VM Motori V6 turbo EcoDiesel uses the common Bosch CP4.2 HPFP, or High Pressure Fuel Pump. This is a common part on many VW/Audi, GM, and Ford diesels. Coming from multiple VW TDI's and a BMW diesel, I'm well familiar with the issue and I just wanted to share with any of you all who may be new to diesels.

First off, don't rely upon me as a single source of information, do a quick Google search of your own and you will see that there is a bunch of info out there on this subject. Try "Bosch CP4.2 lubricity" for starters.

The issue with our HPFP's is that the lack of a universal standard in the USA for good diesel fuel. Some regions are great, while others are horrible. In Texas for example, the major metro areas are mandated under the Texas Low Emission Diesel Program, or TxLED which requires amongst other things, a minimum cetane of 48. https://www.tceq.texas.gov/airqualit...eandiesel.html

The main thing with our Bosch CP4.2 is getting it adequate lubricity. Going off of my memory, I believe the Bosch HPFP requires a minimum of 460 wear scar. In Europe and even Canada, this is fine as their average diesel quality meet or exceed this rating. Unfortunately, in the US the average wear scar of our diesel is like 560, with some measured levels much higher. VW has been good on this issue with replacing many HPFP's under warranty, some even out of warranty.

Fortunately, this issue can somewhat easily be remedied by just adding back some of the lubricity lost when they took the sulfur out of our diesel in 2007, with the now mandated low-sulfur diesel. In this case, as little as B5 diesel can add back all the lubricity lost to protect your HPFP, so B5 is actually good. B6 to B20 can go fly a kite as higher levels do nothing favorable for our engines past B5.

If you're worried about finding B5 (and not B6 - B20) or just like the added piece of mind of a little protection, you can add a lubricity additive to your fuel at every fill. I use Stanadyne Lubricty which can be had at Autozone or ordered online in bulk at more reasonable prices, but there are many other comparable Lubricty additives that I'm sure work just fine.

Stanadyne makes diesel fuel injectors and it's just the first one I started using 25 years ago. Lubricity additives are relatively inexpensive as they go a long way, and in turn are a small price to pay for peace of mind with our HPFP and diesel injectors. Remember, our diesels are Common Rail and our fuel pumps are operating at 2 bar, or roughly 29,000 PSI!

Also, notice in the MOPAR service contracts that while fuel injectors are covered under warranty for both gas and diesel, they are not covered if they are clogged. Using a quality diesel additive like Stanadyne lubricity and their Performance additive go a long way to keep our diesel injectors clean.

Again, don't take my word for it, do your own research, draw your own conclusions, and make your own decision.

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Old 07-08-2015, 05:48 PM
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Re: Bosch CP4.2 HPFP and lubricity...

Good info.

I've been adding a fuel additive and the sound of the clatter is much reduced about 10 minutes after that stuff goes in.

I can't say for certain if MPG, long term wear, and what not are actually improved any but I feel that less noise is probably indicitive of reduced diesel ignition delay and reduced wear on injection parts.
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Old 07-12-2015, 02:08 AM
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Re: Bosch CP4.2 HPFP and lubricity...

Yeah, the things I would do for a b5 station nearby
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Old 07-21-2015, 11:50 PM
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Re: Bosch CP4.2 HPFP and lubricity...

I ended up getting some Stanadyne performance/lubricity additive that I'm going to try for a while. Cheap peace of mind I suppose. Lot's of diesel shops highly recommend Stanadyne.
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Old 07-22-2015, 02:28 PM
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Re: Bosch CP4.2 HPFP and lubricity...

If your just interested in lubrication for the pump, check out Opti lube XL.

Thats the route I am going to go. Interesting test numbers.

Mike V
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