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  1. #1

    Unhappy Low oil.....damage done?

    I had not checked my oil for two months....shame on me. "check gages" light comes on twice briefly for about 4 seconds each, i check my oil and there is none on the dipstick. i had heard no knocking or strange noises coming from the engine. it was running fine. i put in 1 quart....let it sit for a few minutes, nothing. Another quart, started it up, let it sit, nothing. 3 quarts, same process and bam! oil level was to the operating range. i let it run for about 10 minutes, still no strange noises and it had consistant oil pressure. drove down the road, seemed to be fine. Is there anything i could have damaged that i would not notice right away? i really hope this was just a close call!

  2. #2
    Legend

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    More info please, truck year engine. i did the same thing I eventually fried the exhaust valve on one of the cylinders but no damage to the cylinders or crank.
    99 K1500 Suburban LT "THE BEAST"
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  3. #3
    Sr. Apprentice VectraGT's Avatar
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    One of the first signs of thermal stress (increased thermal stress due to the lack of a cooling agent and friction reducer) is discoloration. You can look for this on your valves and even in your oil. Give your engine a good oil flush. Catch the first few drops that come out of your engine and run it between your fingers. Depending on the age of your engine and how long it has been since you changed your oil you should not feel any grainules. Once the oil has drained into a bucket, or what ever you use, look at the general color. Deep black with purple hue indicates thermal stress. Another great way to see what happening on the inside of your engine is to check the spark plugs. They are the easiest to get to and usually indicate whats going on in there. Hope this helps.
    -Jon
    JR
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  4. #4
    Legend unplugged's Avatar
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    I'd say no unless you were beating the snot out of the truck. They don't call 'em "idiot lights" for nothing. They are there to save us from doing major damage. You probably caught it early enough.

    Here's my "low oil" light story:

    Hanging out at a friends gas station this lady rolls up in a caddy. She says "Fill 'er up and add a quart of oil." (Yes I'm that old it was back in the day when gas was full service) So I pop the hood on this 70 deVille and there is NO DIPSTICK! Next is the puzzled look and then I ask the lady "Where's your dipstick?" She says "Lost it." There happened to be another caddy on the lot for service so we borrowed the dipstick from it. The lady's engine was 4 quarts low! She said she didn't know any better and that her routine was to add a quart whenever the light came on. Judging by the color of the oil, the oil hadn't been changed in awhile. I sent a runner across the street to my dad's parts store for a dip stick and in a few minutes she was pulling out of the driveway with a tank full of gas, a clean windshiled, four qts of oil, and a better understanding of the importance of oil in the crankcase.
    There is no way to happiness....happiness is the way.:yipi:
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  5. #5

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    If your oil pressure drops TOO low your PCM will cut the voltage to the fuel pump. So I would say you are OK and probably didn't do any damage.
    Jim

    2004 SILVERADO 2500HD LS
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  6. #6
    Sr. Apprentice VectraGT's Avatar
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    Quote Originally Posted by Jimmiee View Post
    If your oil pressure drops TOO low your PCM will cut the voltage to the fuel pump. So I would say you are OK and probably didn't do any damage.
    What year did they start implementing this fuel cut off?

  7. #7

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    Quote Originally Posted by VectraGT View Post
    What year did they start implementing this fuel cut off?
    I'm not sure what year. I've read on IATN several posts about a no start condition because of the oil pressure sender being bad. I'll see if I can dig up some more info.

  8. #8

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    On a similar note...I took my truck into an oil change place last oil change because I didn't have time to do it myself (shame on me). I knew I was a quart down (rode on the dunes and did some off-roading, so I knew I'd use a quart between changing). The guy at the oil change place tried to sell me on some oil additive/cleaner...something like that. I haven't used that stuff before...but I did see him poor something into my oil reservoir before adding regular oil. Maybe was a cleaner or something. Is it recommended to use the additive when you change your oil???
    Mindi
    1998 1500 Silverado Z71
    2006 YFZ450

  9. #9

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    Update..I just checked several different years of GM trucks and I can find no proof that GM is using / used the fuel pressure cut off. I know Ford and Mopar use this but I can't find where GM uses it. I did read a few posts on IATN where the the oil pressure caused a no start but maybe it was a passenger car rather than a truck. I'm going to dig around a little more and see if I find anything else.

  10. #10
    Sr. Apprentice VectraGT's Avatar
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    Quote Originally Posted by Jimmiee View Post
    Update..I just checked several different years of GM trucks and I can find no proof that GM is using / used the fuel pressure cut off. I know Ford and Mopar use this but I can't find where GM uses it. I did read a few posts on IATN where the the oil pressure caused a no start but maybe it was a passenger car rather than a truck. I'm going to dig around a little more and see if I find anything else.
    That will be good to know... but hopefully something I will never have to find out my self. Its a good thing that GM still puts the oil pressure gauge in the cluster.

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