[BB_cuda]

I just switched from Power Service Diesel Kleen (PS DK) to Optilube XPD. I'm on my second tank and am wondering what others are using for mix ratio. I'm attaching the mix ratio instructions to guide our discussion.

I used 1/2 oz per gallon per the sentences above the table for maximum cetane boost. This equates to the cold weather recommendation. Car is ever so slightly running different than when using the PS DK.

My practice with the PS DK was 4 oz/10 gallon(equates to .4 oz/gallon). Their label also had the "double it for max cetane boost". So, I was using 0.8 oz/gallon.

So, 2 things are going on here. I'm using .5 oz per gallon instead of .8 oz per gallon. I've also read that PS DK has a little more cetane boost than Optilube.

I did notice on second tank that fuel economy was a little better than 1st tank. I'm dismissing that to possibly be just the tank of fuel itself as I got 2nd tank on way home from central Texas. I will watch for next few tanks to see if slight increase in fuel mileage stays.

Fellow Optilube users, any comments please? Thanks

[kydiesel35]

I use anywhere from 2-4 oz for 16 gallons of diesel.

[BB_cuda]

Originally Posted by kydiesel35

I use anywhere from 2-4 oz for 16 gallons of diesel.

At 4 oz per 16 gallon, you are doing it perfectly with left side of table (no 2x for max cetane). Thanks

[RollingCoal]

I've been using 1/4oz per gallon since April. If I miss a tank I seem get 1-2 mpg less. You can purchase it through a VW TDI Group Buy and save a significant amount, plus fixed shipping. Just Google "VW TDI Optilube Group Buy," and this is direct from Optilube.

[BB_cuda]

Originally Posted by RollingCoal

I've been using 1/4oz per gallon since April. If I miss a tank I seem get 1-2 mpg less. You can purchase it through a VW TDI Group Buy and save a significant amount, plus fixed shipping. Just Google "VW TDI Optilube Group Buy," and this is direct from Optilube.

Thank you.

[Greck]

What is this fluid for?

[BB_cuda]

Increase lubricity of the fuel. High pressure fuel pump benefits in lower wear rate.

[RollingCoal]

Originally Posted by Greck

What is this fluid for?

As BB_Cuda stated, the biggest benefit is adding back some of the Lubricity lost with ULSD. It also increases cetane, helps to clean the injectors, and stabilizes diesel fuel. It is highly regarded as one of the best diesel additives available for today's ULSD. I use the XPD formula, but they have others.

[JOHNNYBRAVO1]

I've been using TK7 and felt it worked great. They show a comparison on youtube

[BB_cuda]

My point of inquiry was whether I'm over doing it by using 1/2 oz per gallon (1:256 ratio) vs 1/4 oz per gallon (1:512 ratio).

Car seems to have adjusted to different additive and is back to same behavior. It was only at idle that I noticed an ever so subtle difference.

I have used additive in every tank and even on long trips I carry the jug with me.

[Nadir Point]

16oz. of 2-stroke oil per tank gives the same protection for alot less money.

[DWR]

Originally Posted by UberArchetype

16oz. of 2-stroke oil per tank gives the same protection for alot less money.

Please show data. Here's a study that shows there is no significant difference - despite all the testimonials you can read on the internet.

http://www.fuelexpert.co.za/2-stroke...ical-study.php

More than that it does not have the other benefits, such as cetane improvement. Worse, there is evidence it can create injector fouling in a modern CR diesel (see same study). Finally, some manufacturers of 2 stroke oils specifically recommend it not be used in diesel fuel. I'll stop there.

[kydiesel35]

Originally Posted by BB_cuda

My point of inquiry was whether I'm over doing it by using 1/2 oz per gallon (1:256 ratio) vs 1/4 oz per gallon (1:512 ratio).

Car seems to have adjusted to different additive and is back to same behavior. It was only at idle that I noticed an ever so subtle difference.

I have used additive in every tank and even on long trips I carry the jug with me.

Less is more if you are using good diesel. I just refueled and used 3 oz total xpd for the whole tank;4oz is noticeably smoother.

I like to run straight diesel at times, one or two tanks additive then one diesel.

The "boost" they sell is just cetane but with a little lubricant as well (Mineral oil). That product seems to last an eternity you barely use any and it's only for summer use.

The only complaint I have about these products is the nuclear smell . Besides that I've been running it for 35k with no issues.

*Also. Optilube sells small 4oz bottles that you can pre fill which makes it much better for traveling. They are only like $2 a piece too.

[BB_cuda]

kydiesel35, I got a couple small containers and a pump. I also got an odor free container to put the small ones in for the road.

For DWR: the optilube site has a link to a test where 20 different additives were run. I'm having IT issues trying to paste that link here (using phone). Biodiesel had the largest reduction in wear rate and Optilube was 2nd place . Powers Service Diesel Kleen was 10th place. Perhaps I can go get on PC to paste in link.

I will go back to 4 oz per full tank on next fill up. On the stink front, optilube is no worse than the PSDK.

[RollingCoal]

^ The report is known as the Spicer Report. It is a good read regarding lubricity.

[DWR]

Originally Posted by BB_cuda

For DWR: the optilube site has a link to a test where 20 different additives were run. I'm having IT issues trying to paste that link here (using phone). Biodiesel had the largest reduction in wear rate and Optilube was 2nd place . Powers Service Diesel Kleen was 10th place. Perhaps I can go get on PC to paste in link.
.

Yes, I was referring to adding 2 stroke oil as a substitute. Nothing I have seen says it is equivalent to these additives.

[BB_cuda]

http://www.diesel**********/forum/76...y-results.html

base line was diesel with no additives with HFFR (wear scar measure method) of 636. Normal pump ULSD is better than this due to additives
HFFR=High Frequency Reciprocating Rig
#1)biodiesel at 2% was best (soy based) at 221
#2)optilube XPD was 317 HFFR at 256:1 ratio (fuel:additive)
#7) 2 cycle oil was 471 HFFR at 2% mix
#10) Power Service diesel kleen was 575 HFFR (400:1 ratio)

EDIT: replace **** with place dot com

[Searcher]

Originally Posted by JOHNNYBRAVO1

I've been using TK7 and felt it worked great. They show a comparison on youtube

So I looked up this TK7 and it looks pretty promising. Then I came across this video and wanted to know what you all think about it?

Also Johnny what difference has it made for you?

[DWR]

Try that with diesel fuel - you'll have to conclude it is the worst thing to put into your diesel engine. Hmm, maybe gasoline will burn cleaner ...

[Nadir Point]

I find it interesting how Optilube recommends doubling the dosage in cold weather.

[RollingCoal]

Originally Posted by UberArchetype

I find it interesting how Optilube recommends doubling the dosage in cold weather.

The recommendation for doubling the dosage in winter is due to the change from Summer Blend diesel to Winter blend. Winter blend is known to have less energy (approx 3%), and often contains kerosene or naphtha. Both of these are known to cause lower lubricity than summer diesel.

[dmanb2b]

BB, are you continuing to see better MPG from XPD vs PS? I have been toying with switching to XPD as well. I have run PS in my Jetta and now the D with no issues. Also toying with just going straight diesel, since the HPFP in our cars seem to be more reliable vs the VW CRs.

I really wanted to start with XPD on the Jetta, but got put off that they are just not a large volume manufacturer and had even reformulated XPD since the spicer report was done many years ago. That coupled with some contamination issues just kept me going with PS. Looks like the contamination issue was isolated/corrected, so have been thinking about the switch.

Below is a long thread in TDIclub...last few pages discuss the issues I'm referring to.

http://forums.tdiclub.com/showthread...366933&page=26