I have a 1995 GMC 5.0L. When it is cold the oil pressure only reads between 40 and 60. When it is warm it drops to the large mark between 0 and 40. I was just wondering what is normal?
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Anonymous
ANSWERS: 1
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What I would consider "normal" would be the 40-60 range. If your engine has relatively high mileage, you should consider switching to a heavier viscosity oil. For example, if you are now using 10w30, try switching to 10w40 or maybe even 20w50 (what I use in my own truck) this may help get your pressure back up. If not, it may be that your oil pump is a little weak. You may try changing the oil pressure sending unit as well to insure that you are getting an accurate reading.
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