What exactly is the difference in different types of gas? I pump the midle one, (89?) into my lexus sc 400 1992, is that the gas I should be putting in it?
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Romiex69x
ANSWERS: 5
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read the manual.. it may be higher or lower. most reports say pumping higher grade gas into a car may not affect anything..like pumping 91 into a car that requires 87... you might be able to save some dough at the pump...
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there are two main differences. the first is the difference between unleaded and leaded (which is pretty hard to find anymore). the second difference has to do with the octane levels. what does your car need? i'd check the manual or ask the dealership if you can't find the answer in the manual!
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Given that a 1992 generally has a lot of miles on it, it is entirely likely that the octane requirement has increased slightly due to engine deposits and other age/wear/use-related factors. Even if this isn't the case, if you drive it in an even remotely sporty manner 89 is likely your best bet; full-on premium if you REALLY drive it hard.
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Ok, so the point of this post was to tell the world what kind of car you drive...even if only in your imagination...
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The different grades are what's called the 'octane rating.' Skipping technical details, it is a measure of whether the air/gas mixture burns smoothly in the cylinder, or if it explodes. The exploding is called 'pinking' and sounds like a tinkle/rattle in the engine mostly noticeable at low speeds. Lower octane ratings are more likely to cause pinking, and engines with higher compression ratios are more likely to pink. If a car is pinking, it is getting lower gas mileage than it could, and may be damaging the engine as well. Many cars will get better mileage on a higher grade of fuel as well as running better. Worth checking,.
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