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post #1 of 6 (permalink) Old 01-08-2013, 03:36 PM Thread Starter
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Gas

I just bought an 05 LR3. I was wandering if I should absolutely use 93 or if 87 or 89 is ok for gas. I dont want to create problems down the road, just unsure how much it matters.
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post #2 of 6 (permalink) Old 01-10-2013, 11:47 AM
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The difference in 87, 89, 93 etc is not quality. It has to do with ignition characteristics. The wrong octane for a given engine, due to compression ratio, can either ignite prematurely or not completely thus causing very poor performance. And can also foul up sensors and such down the exhaust stream.
You can buy high quality 87 gas and also very poor 93 octane. Point being... Higher number doesn't necessarily mean higher quality.


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post #3 of 6 (permalink) Old 01-10-2013, 12:22 PM
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Yes, you should burn 93 octane. Compression ratio requires it to avoid an octane detonation ping. A lower grade wont cause imadiate damage but long term continued use can / will cause damage.

Here is a decent writeup on the issue. Detonation and Pre-Ignition

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post #4 of 6 (permalink) Old 01-10-2013, 03:21 PM Thread Starter
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Thanks for the help.
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post #5 of 6 (permalink) Old 01-12-2013, 09:16 AM
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We just need to take the damn ethanol cr*p out of it....
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post #6 of 6 (permalink) Old 01-14-2013, 08:06 AM
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If u read the owners manual it say 91 and higher is the rite fuel to use any thing lower than that will cause a knocking noise...


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