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Old 09-27-2014, 02:47 PM
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Cetane ratings

Any diesel experts know what cetane rating is recommended for the 3.0 Ecodiesel? And the manual gives stern warnings about adding any additives - but makes no mention of cetane. I have read that the European standard is about 55 while the US is 40.

Suggestions welcome!

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Old 09-27-2014, 05:52 PM
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Re: Cetane ratings

I've never seen it published on a pump in Tennessee. I've been driving diesels since my 1978 VW Diesel Rabbit.
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Old 09-27-2014, 07:08 PM
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Re: Cetane ratings

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Originally Posted by ExcursionDiesel View Post
I've never seen it published on a pump in Tennessee. I've been driving diesels since my 1978 VW Diesel Rabbit.
I'd have to agree, it's not a published number.. had a vw bug tri, put 200k on it, using cetane additive never made a measurable difference in performance or mileage..
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Old 09-27-2014, 07:38 PM
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Re: Cetane ratings

Cetane numbers (CN) are on the technical data sheets (TDS) for the particular fuel. With a bit of digging, these can be found on the manufacturers' web sites. Here in Oz they range from 46 to 52. A higher CN means the fuel ignites quicker and therefore the engine runs smoother but that's about it. I don't think diesel engines are all that fussy about the CN. I certainly haven't seen any minimum requirements published for the 3L CRD.

PlayGolf69,
Since you are in California you don't have a problem. I understand that California requires a minimum CN of 53 whereas the in some other states it can be as low as 40.
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Old 09-28-2014, 10:11 AM
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Re: Cetane ratings

I've sampled #2 off road diesel for work, cetane is always 40-44, this test costs $200.

Had one come back at 39, mixed in diesel kleen cetane additive to the prescribed ratio, circulated the fuel using a pump/filter. Re sampling showed it measured cetane of 40. I don't think additives help cetane much.


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Old 09-28-2014, 12:11 PM
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Re: Cetane ratings

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Originally Posted by BobT View Post
Cetane numbers (CN) are on the technical data sheets (TDS) for the particular fuel. With a bit of digging, these can be found on the manufacturers' web sites. Here in Oz they range from 46 to 52. A higher CN means the fuel ignites quicker and therefore the engine runs smoother but that's about it. I don't think diesel engines are all that fussy about the CN. I certainly haven't seen any minimum requirements published for the 3L CRD.

PlayGolf69,
Since you are in California you don't have a problem. I understand that California requires a minimum CN of 53 whereas the in some other states it can be as low as 40.
I've had trouble confirming what you just said about California, so thanks! I'm learning! My interest in cetane was sparked when I read that efficiency, hence mileage, is increased if the combustion occurs at "exactly" the right time. Sure, diesels will run just fine with different cetane ratings but if there is an optimum for an engine it would be nice to know. (Of course even knowing that doesn't necessarily mean that you'll find it at your local station.
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Old 09-28-2014, 01:14 PM
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Re: Cetane ratings

Academic exercise since that data isn't posted. I never incurred an issue with cetane and driveability but have with water filling the filter. Been driving diesel tractors and trucks for a long time and my last SuperDuty went over 180K miles with no issues regarding fuel, lubricity with low sulfur but did happen to run it out of fuel once.
Only additive I ever put in was Stanadyne once in a while.
Have not and don't plan to put Stanadyne in my JGC until warranty is over...
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Old 09-28-2014, 01:32 PM
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Re: Cetane ratings

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Originally Posted by fun2drive View Post
Academic exercise since that data isn't posted. I never incurred an issue with cetane and driveability but have with water filling the filter. Been driving diesel tractors and trucks for a long time and my last SuperDuty went over 180K miles with no issues regarding fuel, lubricity with low sulfur but did happen to run it out of fuel once.
Only additive I ever put in was Stanadyne once in a while.
Have not and don't plan to put Stanadyne in my JGC until warranty is over...
Thanks. My only past diesel experience was a 1984 Ford F-250 some years back. Smoky, noisy and smelly - but it was a great truck for pulling horse trailers. Gave it to my daughter who loved the truck (and her horses) and mourned like she lost an old friend when she got rid of it. Now I'm buying the Jeep GC to replace my 14 year old Toyota Tundra which replaced the F-250. Great truck but I don't need a truck anymore. (I won't even get my Jeep for at least another 6-8 weeks but I'm reading all I can (the entire Diesel supplement for example) so I'll be ready to take care of it properly when I get it)
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Old 09-29-2014, 06:28 AM
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Re: Cetane ratings

Quote:
Originally Posted by fun2drive View Post
Academic exercise since that data isn't posted. I never incurred an issue with cetane and driveability but have with water filling the filter. Been driving diesel tractors and trucks for a long time and my last SuperDuty went over 180K miles with no issues regarding fuel, lubricity with low sulfur but did happen to run it out of fuel once.
Only additive I ever put in was Stanadyne once in a while.
Have not and don't plan to put Stanadyne in my JGC until warranty is over...
Unless the manufacturer can show you data that proves the additive is totally ashless I wouldn't be putting it anywhere near a DPF. They may claim their product is DPF safe but I bet they have no data to prove it.
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Old 09-29-2014, 08:39 AM
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Re: Cetane ratings

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Originally Posted by BobT View Post
Unless the manufacturer can show you data that proves the additive is totally ashless I wouldn't be putting it anywhere near a DPF. They may claim their product is DPF safe but I bet they have no data to prove it.
Good point. I was reading on a Duramax forum about DPF issues (yes, they have issues too) and someone posted that their regen intervals shortened noticeably when using DieselKleen. Is this because it creates more particulate?
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Old 09-29-2014, 10:52 AM
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Re: Cetane ratings

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Originally Posted by BobT View Post
Unless the manufacturer can show you data that proves the additive is totally ashless I wouldn't be putting it anywhere near a DPF. They may claim their product is DPF safe but I bet they have no data to prove it.
Good advice, however my original question was not really about additives as much as wanting to know what cetane rating was considered the "right" rating for our Jeep's diesel engine, if in fact it mattered, and which stations pumped that fuel. I agree that putting in additives when you're not sure about what side effects they may have is not a good idea.
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Old 09-29-2014, 12:44 PM
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Re: Cetane ratings

From reading this thread, it sounds to me like we don't have a clear way to know what Cetane rating is being sold without researching brands. Even then, diesel is a commodity fuel and some stations don't even source the same brand diesel as their gas. Without knowing the originating refinery, how do we really know? I try to stick with Shell stations since they seem to make an effort to provide an auto diesel pump in most locations.
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