Fuel Octane When Towing - Nissan Frontier Forum
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post #1 of 42 (permalink) Old 04-16-2019, 07:14 PM Thread Starter
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Fuel Octane When Towing

the owner's manual says to use 87 octane or higher but when towing up steep hills i hear the valves rattling and such so i was wondering if some of you guys use 89 octane or maybe 93 octane when towing?

i was at 3/4ths of a tank of gas today and i filled up with 89 octane and it did seem to quiet down the valves a bit. what do you guys do?

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post #2 of 42 (permalink) Old 04-16-2019, 07:30 PM
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For towing, I don't think it's a bad idea.

Towing makes the engine work harder - which raises cylinder temperatures - which increases the chances of preignition ("pinging").

Higher octane gas is less prone to preignition.

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post #3 of 42 (permalink) Old 04-16-2019, 07:44 PM
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DescriptionKnocking in spark-ignition internal combustion engines occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front. Wikipedia

Not your valves. If your motor is pinging, it is telling you it needs higher octane or you got bad fuel.
I use the highest octane available but it is because I am hard on the truck.

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post #4 of 42 (permalink) Old 04-16-2019, 07:47 PM
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Quote:
Originally Posted by whistler View Post
Not your valves. If your motor is pinging, it is telling you it needs higher octane or you got bad fuel.
I use the highest octane available but it is because I am hard on the truck.
And / or your knock sensors aren't working properly and / or your cooling system isn't up to the task.

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post #5 of 42 (permalink) Old 04-16-2019, 09:05 PM
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Yes, just replaced 02 sensor and valve timing
solenoid .little over 7000 miles.

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post #6 of 42 (permalink) Old 04-16-2019, 11:24 PM Thread Starter
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it's not a constant thing. it only happens when going up a steep, long hill.

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post #7 of 42 (permalink) Old 04-17-2019, 12:13 AM
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That is where the load increases and prone to do it then.

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post #8 of 42 (permalink) Old 04-17-2019, 02:30 AM
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try a different brand of fuel - it should not ping w/regular

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post #9 of 42 (permalink) Old 04-17-2019, 06:59 AM
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Only use top tier brand fuel, none the the off brand ones. Then see what happens.

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post #10 of 42 (permalink) Old 04-17-2019, 07:45 AM
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Guys, I am going to chime in here.

I have a 2019 Frontier and is got less than 1500 miles on it - so its new.

I filled up the first time with mid-grade fuel (89) after the full tank from the dealer when new; and, i notice the motor was considerably more quiet. I just chalked it up to the dealer gas being bad at the time and never thought much of it at the time. But, upon a few more fill-ups, I can say that mid-grade gas seems to be more agree-able for my truck. But, I also have to say that other than noise, I do not see any other impact - just normal driving - no towing. And, it does not seem to effect my MPG either.

Well, for what its worth,

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