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How do you find out what the Cetane level is in a fuel> I understand you want it somewhere between 49 and 55?
 

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You could ask the station attendant...but they just work there. They might have some paperwork from the tanker delivery. It's not posted on the pumps like gas and gas is getting diluted with ethanol too. As the saying goes, drive more worry less. And if you're really worried, add a few ounces of powerservice additive to each tank.
 

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Best Diesel Fuel?- Found this on the web

http://myspace12.info/viewthread.php?tid=101404

This above link discuss diesel fuel additives but also provided the following Cetane levels by Fuel Companies (as provided from Corporate offices) and is inline with what this websites administrator (CCBB) has also found.

***Cetane levels by fuel company. To ensure accuracy if you have a level to add to the list please forward an email from a corporate office to me, and I will add it to the list. Please bear in mind that the current minimum from refiners in North America is 40. Depending on the quality of the oil used as well as refining processes you'll find 40-42 from refiners in the US and Canada. Anything above that has to do with specific companies additive packages. When companies give a minimum value then it will be listed as a single number. When a company gives a range of numbers bear in mind that more often than not you'll probably find the lower number rather than the higher number. If 40 is listed then it generally means that fuel is bought as is from the refiner--if someone messes up and doesn't put in enough additive at the refinery then that can cause major problems for your fuel system. It's recommended therefore that if you get the inexpensive fuel with low cetane you use a cetane booster (PowerService, Redline 85+ or Stanadyne are all great choices), or run a little biodiesel in the tank. If something higher than 42 is listed then the retailer adds their own additive package in addition to the standard refinery additive package. Generally speaking as long as 49 or higher is listed you do not need to worry about adding any additives yourself.

BP (Amoco branded), 51;
Chevron, 49; or 51 with Techron D labels in select markets
ConocoPhillips through the 76 stations (California) 47-53
PetroCanada, 47-51
BP (Powerblend 47, otherwise 40-42)
Shell, 46;
Sinclair, 46;
Sunoco Gold, 45 (often +1-5) Sunoco regular is usually 40.
Exxon/Mobile, 43-46
Holiday Stations, 40-43
HESS, 40-42, can be up to 45.
Husky, 40 + diesel Max additives raise another 1-3 from there (41-45 max)
Love's: 40
Pilot: 40
Valero: 40
Sheetz: 40
Flying J, 40
 

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Have a 2012 Passat TDI. I've been purchasing Stanadyne at a facility that rebuilds fuel injector systems for large trucks/tractors. I asked one of the owners how much to use in my 2011 Jetta TDI but he was unable to be definitive about it. He did say, however, that Stanadyne is an incredible product and that he can tell which vehicles he's worked on if Stanadyne has been used. He did tell me that using more than recommended it has no added benefits. I've been putting in one measure in a litre bottle per fill up in the winter and half a measure in the summer as, I was told, the additive is not as necessary in the summer months. What do you recommend?
 
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