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  #1  
Old December 3rd, 2009, 06:25 PM
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Fuel additives for tdi engines?

Several diesel owners have told me that with the new low sulfur diesel fuels that it is prudent to use a fuel additive with each tank of diesel fuel. Does anyone do this and if you do which one?
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  #2  
Old December 3rd, 2009, 07:23 PM
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I use Stanadyne in my diesel. Use the Lubricity Formula during the summer and the Performance Formula during the winter.

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Old December 3rd, 2009, 07:38 PM
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The best is Optilube XPD.
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  #4  
Old December 3rd, 2009, 11:11 PM
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I'm using Stanadyne Winter Formula right now. KevinNY convinced me to try Optilube XPD so thats next on the list.

I have a related question. Does it smoke more when using additives? They're essentially oils, right so I assume it would smoke a lot more when using them. Just curious.
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Old December 4th, 2009, 12:03 AM
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Quote:
Originally Posted by Manimal
I'm using Stanadyne Winter Formula right now. KevinNY convinced me to try Optilube XPD so thats next on the list.

I have a related question. Does it smoke more when using additives? They're essentially oils, right so I assume it would smoke a lot more when using them. Just curious.
Mine smokes more I think. I have used additives for a long time ever since I found out how crappy NA diesel is. I don't think there is any difference that anyone can tell between any brands though.
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Old December 4th, 2009, 12:09 AM
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I've heard Optilux XPD is for ALL Year round usage as the Stanadyne has different formulas.

I ordered XPD ( awaiting arrival )
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Old December 4th, 2009, 02:57 AM
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Here in the UK, all we get is low sulphur diesel, have done for many years now, and all the Tdi's work fine on that.

Obviously i'm not sure if there are any differences 'tween UK & US spec fuels though.

We can also now get Shell hi octane type diesel... that makes a Td5 go well!! (and my shogun too!) but costs about 8p more per litre.
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Old December 4th, 2009, 06:01 AM
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8p? Litre? TD5?
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  #9  
Old December 4th, 2009, 06:39 AM
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Murphy's Miracle Oil year round for ever. I have heard of folks using a pint to a quart of gasoline per tank- especially in the winter, but I never have tried it. These are old farm tricks that some swear by- MMO has been around a very long time.
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Old December 4th, 2009, 01:46 PM
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I've just started using the Optilube XPD (on my 2nd tank) in the 200Tdi. I also run B5. I've noticed a bit more smoke since using the XPD. Cold weather starting has improved, and it seems like the mileage is up a bit, but need more data there. The interesting thing I've noticed is that my idle is up 50-100RPM over what is was prior to using XPD. With the higher idle, shit vibrates that didn't before at stops and it's annoying. Need to look into lowering it.

Forgot to add that the lubricity study somebody here pointed me too was very enlightening in regards to diesel fuel additives. I've attached it.
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File Type: pdf Diesel_fuel_additive_test.pdf (130.7 KB, 85 views)
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  #11  
Old December 4th, 2009, 04:57 PM
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Quote:
Originally Posted by tomaco1
8p? Litre? TD5?
Yeah, yeah, you uncouth lot! you need teaching in the ways of the rest of the world


8p = about $45 with the current exchange rate.

Litre = a nice way to drink lager

Td5 = a proper diesel engine
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  #12  
Old December 4th, 2009, 05:00 PM
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Let er spool up slow

Stanadyne for the last 6 years. Great results down to -20 below zero
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  #13  
Old December 4th, 2009, 05:14 PM
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It's all snake oil. Mostly kerosene or other equally unhelpful stuff that simply goes out the tailpipe with everything else. Just keep your filters renewed and don't get water in the system.
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  #14  
Old December 5th, 2009, 02:57 AM
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I just stick some injector cleaner in once in a while.
Water in the fuel in very bad=expensive for the injector pump.

Where do you get snake oil? What's it good for?
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Old December 5th, 2009, 08:09 AM
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Lager?
Quote:
Originally Posted by diesel_jim
Yeah, yeah, you uncouth lot! you need teaching in the ways of the rest of the world


8p = about $45 with the current exchange rate.

Litre = a nice way to drink lager

Td5 = a proper diesel engine
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  #16  
Old December 5th, 2009, 08:40 AM
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I add "more right welly" as often as possible (aka Italian tune up). Tdi's seem to respond well to it.
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Old December 5th, 2009, 11:00 AM
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Quote:
Originally Posted by Maryland 110
I add "more right welly" as often as possible (aka Italian tune up). Tdi's seem to respond well to it.
Speaking of which; what's a safe max RPM for a 200Tdi? Seems like I read 4k somewhere, but that seems high.
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Old December 5th, 2009, 11:39 AM
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Quote:
Originally Posted by newfD90
Speaking of which; what's a safe max RPM for a 200Tdi? Seems like I read 4k somewhere, but that seems high.
3000 rpm cruising= around 75mph with standard diffs 235/70 R16's and a 1.222:1 transfer box in a Discovery 1. Slightly less speed at the same RPM in a defender - 1.444:1 transfer box but 235/85R16's.
They'll sit at that RPM all day quite happily. It's very noisy at higher RPM and very little gain when accelerating, I tend to shift up the gears a bit earlier than 3000 RPM too.

Follow-up Post:

Quote:
Originally Posted by tomaco1
Lager?
Nasty pale cold stuff, bit like beer but too fizzy, sort of a kids drink
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Old December 5th, 2009, 12:37 PM
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Quote:
Originally Posted by mikeslandrover
3000 rpm cruising= around 75mph with standard diffs 235/70 R16's and a 1.222:1 transfer box in a Discovery 1. Slightly less speed at the same RPM in a defender - 1.444:1 transfer box but 235/85R16's.
They'll sit at that RPM all day quite happily. It's very noisy at higher RPM and very little gain when accelerating, I tend to shift up the gears a bit earlier than 3000 RPM too.
That's good data and about inline with what I see. I cruise at 75mph at around 2800RPM in my HCPU with 235/85-16s with a 1.198:1 LT230. I get diminishing power returns (and a lot more noise) much above that. I added a VDO Tach, so I may be off a few RPMs due to switch settings...

Quote:
Originally Posted by mikeslandrover
Nasty pale cold stuff, bit like beer but too fizzy, sort of a kids drink
Amen to that!
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Old December 5th, 2009, 01:14 PM
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Quote:
Originally Posted by newfD90
Speaking of which; what's a safe max RPM for a 200Tdi? Seems like I read 4k somewhere, but that seems high.
I bang my 300 up to 4500 all the time. At least I think it 4500 as my tach goes to 4000 and then just kinda bangs back and forth.
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