Question about 1990 Buick Century

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What gas do I use for my 1990 Buick CLM? My 90 yr old Mom just gave me her's with only 26,.000 miles on it and in mint condition. She said to only burn Premium gas in it. Could I use mid-grade (87 octane)?

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  • bitsy8888 Aug 26, 2010

    Now I've been told that gas with 10% ethanol will harm my valves eventually. Is this true?



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Hi, as with most of my older customers they were driving when higher octane fuels were needed so they think that is still needed today. Your vech. only requires 87 octane it was it will run cooler and get better fuel mileage using 87. Enjoy your new car.

Posted on Aug 25, 2010

Testimonial: "Extremely helpful. Will save me lots of $s but thought I'd better check. "

  • wmstalk Aug 26, 2010

    Ethanol 10 or Ethanol Blended Fuels are safe for any vech. engine made after 1970. A lot of debate and finger pointing has gone on about the use. Every valid study that i have have seen has confirmed that no internal damages or driveability issues were caused by the proper ratio of ethanol blended fuel. I have found that a lot of technicians use this excuse of "its to much ethanol" or "bad gas" to explain away driveability problems they cant fix for their customers. Not to say there isnt the possiblilty when a person can buy bad fuel they are just very uncommon in today's market.


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I completely agree with wmstalk and would add that; no, the alcohol will not harm your valves, although I'm sure others will disagree. Some people say that it will harm your injectors and fuel lines as well. The thing is, it's in gas to stay and there is not much you can do about it. I'm sure that it's the least of your concerns at this point anyway. Proper maintenance will keep the car running. Oil changes, filters, and transmission services over the years are your real concerns.

Posted on Aug 26, 2010


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