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  #13  
Old 04-24-2012, 11:16 PM
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Re: Which Diesel

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Originally Posted by Mendo View Post
My fuel card is a Caltex. I had a choice but just took the standard as I wasn't fussed one way or the other. It seems good but I don't have anything to compare it to.

As a side note, my main disappointment is not being able to use highflow pumps because of the small intake on the JGC.
We also used a Caltex fuel card and use Vortex, have been very happy.
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  #14  
Old 04-25-2012, 06:13 AM
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Re: Which Diesel

I’ve just done a web review of Aussie diesel fuels, Shell, BP, Caltex, Mobil and United. None of them guarantee anything above minimum Aussie standard which among other things is: Sulphur ≤ 10, Cetane index ≥ 46, Lubricity ≤ 460. Some claim to have higher “typical” values but there is no guarantee nor is there anything to say that the others don’t achieve them either. The highest is BP Ultimate Diesel which claims typical values of Sulphur 5, Cetane index 52, Lubricity 400. Shell Diesoline 10 and Diesel Extra is close behind with Sulphur 8, Cetane index 49, Lubricity 400. The lower the Sulphur the greener. The higher the Cetane the smoother the engine runs. The lower the Lubricity the better the fuel lubrication.

Some suppliers provide biodiesel variations. 100% biodiesel is designated B100. B5 and B20 are standard fuels with 5% and 20% biodiesel respectively although standard diesel fuel can have up to 5% biodiesel. Jeep allows biodiesel but only to EN 590 standard which allows biodiesel up to 7% only. So for the Jeep, B5 is OK but B20 not. There is nothing wrong with biodiesel in fact it has better lubricating and cleansing properties. However, it produces slightly less power therefore higher fuel consumption. Apparently it also causes problems in older engines so perhaps because of this and the lower efficiency, Jeep is staying on the safe side by not recommending B20 or higher. My guess is where a difference in performance is noticed, it is due to the amount of biodiesel in the fuel but more likely, prevailing winds or psychological because you have just washed the car.
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Old 04-25-2012, 08:04 AM
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Re: Which Diesel

given jeep specify that owner should use Cetane >=50 there is not much choice. I wonder if jeep will void warranty on engine problems if <50 Cetane diesel used. I dont know why the politicians in Au cant make EN590 the standard (used in UK and Europe) which has minimum cetane level of 51.
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Old 04-25-2012, 05:25 PM
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Re: Which Diesel

I've been trying to find out what the cetane number of Caltex Vortex Diesel is, but cant find any definite indication on the web.

The only thing I found is a suggestion on Nulon's website, in a marketing blurb on Nulon Diesel Fuel Booster, that Caltex Vortex Premium Diesel is 53.5 cetane. ... http://www.nulon.com.au/products/Fue.../#.T5h48Ku_FlI

It also suggests that Caltex Diesel is 54.4 cetane. Certainly not a definitive spec.
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  #17  
Old 04-25-2012, 05:51 PM
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Re: Which Diesel

I think we're getting mixed up here. In reading about this, I just noticed that there are two different cetane measures.

The Australian standard says a minimum cetane index of 46, and cetane number of 51. This is in line with EN590 which also specifies minimum cetane index of 46 and cetane number of 51.

The Australian standard also suggests that upto 5% biodiesel can be included in standard diesel.

Cetane index is calculated from fuel density and distillation range. Cetane number is a measurement of the combustion quality of diesel fuel during compression ignition.
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Old 04-26-2012, 02:27 AM
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Re: Which Diesel

I mainly use Caltex Vortex Diesel due to the low foaming formula and it's the closest! Just wish BP Ultimate Diesel was available in Sydney.
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Old 04-26-2012, 02:56 AM
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Re: Which Diesel

Quote:
Originally Posted by savvas View Post
I think we're getting mixed up here. In reading about this, I just noticed that there are two different cetane measures.

The Australian standard says a minimum cetane index of 46, and cetane number of 51. This is in line with EN590 which also specifies minimum cetane index of 46 and cetane number of 51.

The Australian standard also suggests that upto 5% biodiesel can be included in standard diesel.

Cetane index is calculated from fuel density and distillation range. Cetane number is a measurement of the combustion quality of diesel fuel during compression ignition.
Good find! Who would have thought? I've changed my post above. If we can believe what they say, in terms of cetane, it's still BP first, Shell second and who knows about the rest. It seems they are all good provided one avoids the temptation of using cheaper industrial diesel fuels.
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Old 04-26-2012, 03:04 AM
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Re: Which Diesel

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Originally Posted by fix69er View Post
given jeep specify that owner should use Cetane >=50 there is not much choice. I wonder if jeep will void warranty on engine problems if <50 Cetane diesel used. I dont know why the politicians in Au cant make EN590 the standard (used in UK and Europe) which has minimum cetane level of 51.
I couldn't find any specific reference to the cetane index/number in my manual. All it said is that it must comply with EN 590 which requires cetan index >=46 and cetain number >=51. This is essentially the Australian standard anyway so there shouldn't be a problem.
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Old 04-26-2012, 03:54 AM
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Re: Which Diesel

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Originally Posted by BobT View Post
I couldn't find any specific reference to the cetane index/number in my manual. All it said is that it must comply with EN 590 which requires cetan index >=46 and cetain number >=51. This is essentially the Australian standard anyway so there shouldn't be a problem.
I was going by the ref in this page
http://wk2jeeps.com/wk2_maintenance.htm

Diesel: Use only the best quality fuel with a calculated Cetane Index of 50 or higher. In addition, the manufacturer recommends using diesel fuel with a sulfur content of less than 350 ppm.

also I read in there about petrol for 3.8 and 5.7. which is a surprise?

NOTE: The use of Premium gasoline is NOT recommended for the 3.8L or 5.7L engines. Under normal conditions, the use of Premium gasoline will not provide a benefit over high quality Regular and Mid-grade gasoline, and in some circumstances may result in poorer performance.
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Old 04-27-2012, 02:23 AM
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Re: Which Diesel

Quote:
Originally Posted by fix69er View Post
I was going by the ref in this page
http://wk2jeeps.com/wk2_maintenance.htm

Diesel: Use only the best quality fuel with a calculated Cetane Index of 50 or higher. In addition, the manufacturer recommends using diesel fuel with a sulfur content of less than 350 ppm.

also I read in there about petrol for 3.8 and 5.7. which is a surprise?

NOTE: The use of Premium gasoline is NOT recommended for the 3.8L or 5.7L engines. Under normal conditions, the use of Premium gasoline will not provide a benefit over high quality Regular and Mid-grade gasoline, and in some circumstances may result in poorer performance.
That is very interesting about petrol engines. I had a Commodore 3.6L V6. It had knock sensors so in theory it could compensate for different octanes. With premium fuels I found a slight improvement in fuel economy and maybe performance but in terms of $/km, I was way ahead using standard unleaded. I wonder how premium fuels can produce poorer performance? Poorer hip pocket perhaps.
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  #23  
Old 04-27-2012, 05:22 PM
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Re: Which Diesel

Yep, I cant understand the logic on premium petrrol either.

The experience I had in the Jackaroo is that with 98RON there was always a performance and economy boost. However the economy boost was negated by the cost of the fuel.

I always used 98 when it was available ever since I first bought the Jackaroo. The big difference I noticed was in the cleanliness of the fuel system and the engine. The fuel filler stayed as new throughout the life of the car, spark plugs were always clean. The engine oil was always cleaner than expected at change time. When I had the timing belt done at 160000kms, I also asked for valve clearances to be checked and adjusted. The valves were supposed to be done at 100000kms, but I delayed it as there was no noise. The mechanic came back saying that they're still within spec and nothing needs to be done.

I'm always pedantic about using premium fuels and oils and I think it does pay off in the long term.
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