Preferred Diesel Stations
02-26-2015, 06:05 AM
#31
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Thanks, I had both 50 and 51 in my head and couldn't remember which was right. 
Maybe the 50 was something like the recommended minimum to use, either from random forums' people or for certain vehicle manuals or whatever.
But of course that illustrates how bad the general US requirement of 40 cetane is. Whether any major area actually only has 40 cetane diesel is another matter, though, we have no idea what we're really getting. I only know it's supposed to be 48 around here because of TxLED requirements (for Californians, looks like CARB requires 48+ as well).
Maybe the 50 was something like the recommended minimum to use, either from random forums' people or for certain vehicle manuals or whatever.But of course that illustrates how bad the general US requirement of 40 cetane is. Whether any major area actually only has 40 cetane diesel is another matter, though, we have no idea what we're really getting. I only know it's supposed to be 48 around here because of TxLED requirements (for Californians, looks like CARB requires 48+ as well).
03-01-2015, 04:51 AM
#32
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I just added Power Service Diesel Kleen in my 2015 Q5 TDI. I used 16 oz/20 gallons. One of the forum members pointed out that this may be too much, suggested 8oz/20 gal. How much do you use?
03-01-2015, 09:12 PM
#33
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Well one of the great mysteries of diesel fuel is that the cetane rating is not listed. Some states have mandated minimums that are far higher than other states. Most agree that the minimum is 40, which is a long ways away from the optimal 50 or 51. But your fuel could also be 43 or 45 or 48...
Perhaps the best way to handle this is to start off with small amounts and gradually add more and more until you no longer notice a difference in engine behavior. Beyond that you would just be wasting your money.
Using this method I arrived at around 8 oz / 20 gallons... I also mix in 2% biodiesel for lubrication of the injector pump.. around half gallon into 20 if I can remember the math correctly. Since bio has a higher cetane rating as well, you can use higher doses in hot weather, say 4% (and reduce the amount of PS) as a cheaper partial substitute..
In hot weather, the DPF will burn off the soot by itself more easily, so less need for post burn injection events which is where bio causes the problems in high doses. Also in hot weather, the engine's requirements for cetane are less...
Perhaps the best way to handle this is to start off with small amounts and gradually add more and more until you no longer notice a difference in engine behavior. Beyond that you would just be wasting your money.
Using this method I arrived at around 8 oz / 20 gallons... I also mix in 2% biodiesel for lubrication of the injector pump.. around half gallon into 20 if I can remember the math correctly. Since bio has a higher cetane rating as well, you can use higher doses in hot weather, say 4% (and reduce the amount of PS) as a cheaper partial substitute..
In hot weather, the DPF will burn off the soot by itself more easily, so less need for post burn injection events which is where bio causes the problems in high doses. Also in hot weather, the engine's requirements for cetane are less...
03-06-2015, 02:42 PM
#34
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Here's some info I just received from Shell Canada regarding cetane ratings...
The federal minimum cetane number as determined by the CGSB (Canadian General Standard Board) is 40. Cetane number vary with a number of factors such as season and crude sources but Shell ULSD (Ultra Low Sulfur Diesel) regular and V-Power will always meet and exceed the CGSB standard of 40. Typical levels in Canada are in the 40 to 50 range
Shell V-Power ULSD's unique additive technology includes a cetane improver which helps raise its cetane number by approximately one to two points and allows quicker ignition and better cold-weather starting.
The information above applies to south Ontario and to the rest of the country.
Kind regards,
Shell Technical - North America
Email: Shelltechnical-CA@shell.com
Toll Free Tel.: 1-800-661-1771
The federal minimum cetane number as determined by the CGSB (Canadian General Standard Board) is 40. Cetane number vary with a number of factors such as season and crude sources but Shell ULSD (Ultra Low Sulfur Diesel) regular and V-Power will always meet and exceed the CGSB standard of 40. Typical levels in Canada are in the 40 to 50 range
Shell V-Power ULSD's unique additive technology includes a cetane improver which helps raise its cetane number by approximately one to two points and allows quicker ignition and better cold-weather starting.
The information above applies to south Ontario and to the rest of the country.
Kind regards,
Shell Technical - North America
Email: Shelltechnical-CA@shell.com
Toll Free Tel.: 1-800-661-1771
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