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post #1 of 19 (permalink) Old 12-30-2015, 10:55 PM Thread Starter
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Need octane info

Hi Bought a new 15 trailhawk, great ride, elgin ill, traded in a vw tiguan, also good car. filled up today with 93 octane, did some research, diffrent points of view today, hope i did not hurt the enjine, will use 87 or 89 in the future, will one tank matter!
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post #2 of 19 (permalink) Old 12-30-2015, 11:08 PM
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If you have the v6 it says you should use 89 but 87 will work. If you have the 4 cylinder it says use 87.

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post #3 of 19 (permalink) Old 12-30-2015, 11:12 PM
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Originally Posted by mjrsmr View Post
Hi Bought a new 15 trailhawk, great ride, elgin ill, traded in a vw tiguan, also good car. filled up today with 93 octane, did some research, diffrent points of view today, hope i did not hurt the enjine, will use 87 or 89 in the future, will one tank matter!
The only thing the extra octane hurts is your wallet.
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post #4 of 19 (permalink) Old 12-30-2015, 11:19 PM
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meg376 is absolutely correct. I used a tank this summer with no alcohol and 91 octane -- NO PERFORMANCE OR MILEAGE INCREASE was seen. Just a huge chunk o' change gone from my wallet (no alcohol really jacks the price). I use 87 always, even when towing my 4000+ lb. travel trailer. No pinging, no lack of power. 87 is A-OK!!!!

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post #5 of 19 (permalink) Old 12-31-2015, 09:25 AM
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Welcome to the forum from Elgin. I always use 87 octane and no problems at all and plenty of pep with my v-6. I have been to Elgin many times--wife is from there, but I live in SC. I think you will enjoy your new TH as I think they are a great vehicle.

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post #6 of 19 (permalink) Old 12-31-2015, 10:36 AM
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Same. Only used 87. Although I do stick to name brands (Shell, Sunoco, Exxon).

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post #7 of 19 (permalink) Old 12-31-2015, 10:52 AM
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A new octane thread to close out 2015 !! WOOO-HOOOO !!!!!

Welcome to the forum mjrsmr

The Tiguan requires premium I believe (91). The Cherokees don't. Reading on VW forums about octane is fun stuff, so I understand why you [instinctively] went to 93 for your first tank.

Save your money. Go with 87 and enjoy. Really.
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post #8 of 19 (permalink) Old 01-01-2016, 11:32 AM
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Originally Posted by Ampmtnbkr2 View Post
meg376 is absolutely correct. I used a tank this summer with no alcohol and 91 octane -- NO PERFORMANCE OR MILEAGE INCREASE was seen. Just a huge chunk o' change gone from my wallet (no alcohol really jacks the price). I use 87 always, even when towing my 4000+ lb. travel trailer. No pinging, no lack of power. 87 is A-OK!!!!

It might take a few tanks for any difference to be seen. Vehicle will advance timing until it sees some predetonation, then back down some. Not sure how fast that adaptation takes place though.

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post #9 of 19 (permalink) Old 01-01-2016, 11:37 AM
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It might take a few tanks for any difference to be seen. Vehicle will advance timing until it sees some predetonation, then back down some. Not sure how fast that adaptation takes place though.
So, are you saying higher octane is better, to just put a few tanks in and reap the benefits ?

Predetonation :
Quote:
Detonation of a nuclear weapon involves bringing fissile material into its optimal supercritical state very rapidly. During part of this process, the assembly is supercritical, but not yet in an optimal state for a chain reaction. Free neutrons, in particular from spontaneous fissions, can cause the device to undergo a preliminary chain reaction that destroys the fissile material before it is ready to produce a large explosion, which is known as predetonation.
https://en.wikipedia.org/wiki/Nuclea...#Predetonation

Perhaps you meant detonation, or pre-ignition.
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post #10 of 19 (permalink) Old 01-01-2016, 12:16 PM
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Sorry, I did use the incorrect term, detonation is what I was after. No, higher octane is only better if the engine can take advantage of that fuel. And from what I read, the 3.2, while it can run fine on 87, has a recommendation to run 89 octane for maximum performance. An extra .20 per gallon difference? Only each person can judge that, based the value they place on that extra performance, which granted most people might not ever notice.

My SRT-4 had a Mopar upgrade kit that allowed for the use of 100 octane race fuel. If you tried to engage that mode with street fuel, it would kick you back out. But with that 100 octane, you got a helluva boost in power. But street cars cant do that sort of thing. Street cars that allow for variations in octane usually only range one or two grades. If you put lower octane than recommended, the car will pull timing and so you are down a little power.

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