gas for a '99 5.9

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Oct 10, 2006 | 02:25 AM

drew2001k

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Joined: Oct 2006

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gas for a '99 5.9

Hey guys,
Does a '99 with a 5.9 only take 91 or premium ??

~Drew

Oct 10, 2006 | 02:59 AM

IndyDurango

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Joined: Jun 2006

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From: Indiana

RE: gas for a '99 5.9

91 or beter is considered Premium.

On the R/T, 91 octane or better is recommended.

Standard SLT/SLT+ can use anything better than 87 octane.

HTH,

IndyDurango

Oct 10, 2006 | 05:30 AM

36D

Joined: Oct 2006

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RE: gas for a '99 5.9

I have a 99 5.9 SLT+. I run Chevron reg (87) with a bottle of Techron once every 3 months. My 5.9 runs perfect. IMO only run Chevron!!

Oct 10, 2006 | 01:59 PM

2000RT

Joined: Sep 2006

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From:

RE: gas for a '99 5.9

Drew,

If you have an R/T, the manual will state that you need Premium.

However, I have a 2000 R/T, and I use regular unleaded. I notice no
engine knock or decrease in performance.

[8D]

Oct 10, 2006 | 03:16 PM

MuskratJames

Joined: Jul 2006

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From:

RE: gas for a '99 5.9

Quote:

ORIGINAL: 2000RT

Drew,

If you have an R/T, the manual will state that you need Premium.

However, I have a 2000 R/T, and I use regular unleaded. I notice no
engine knock or decrease in performance.

[8D]

It probably has a knock sensor so that it's safe to run regular in it. But I am surprised that you notice no decrease in performance, that's usually the trade-off.

Oct 10, 2006 | 03:59 PM

2000RT

Joined: Sep 2006

Posts: 44

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From:

RE: gas for a '99 5.9

Quote:

ORIGINAL: MuskratJames

Quote:

It probably has a knock sensor so that it's safe to run regular in it. But I am surprised that you notice no decrease in performance, that's usually the trade-off.

I thought I would too. However I haven't. I do not drive it that hard however. I thought I would notice it
pulling my boat ( 5,000 lbs) but I didn't