Oil gauge fluctuating?

1993 DODGE DAKOTA
250,000 MILES • 3.9L • V6 • 2WD • AUTOMATIC
Avatar
NELZIE
  • MEMBER
  • 2 POSTS
When the truck is started on a cold day the oil gauge will be right in the middle but once the truck heats up slowly drops and I'm stopped at a red-light the gauge goes all the way down but when in park the gauge stays steady .
Jan 17, 2023 at 4:11 AM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,256 POSTS
This can happen on older engines because the bearing clearances are starting to get out of spec. Also, if the oil pump is worn out or the pressure regulating spring is broken it can happen as well. You might want to try changing the oil to a heavier weight such as 10/40 or 20/50, roll a new filter on as well.
Jan 17, 2023 at 8:48 AM
Avatar
HAVAS BORES
  • MEMBER
  • 4 POSTS
As a Chevrolet long time shop foreman, I completely agree with Short Flame. Engine oil pressure changes with engine RPM. Simple as that. I can never understand why people have a problem understanding this. An engine oil pump RPM is directly connected to engine RPM.
Jan 17, 2023 at 3:14 PM
Avatar
NELZIE
  • MEMBER
  • 2 POSTS
Would Lucas oil thickener for high mileage motors work?
Jan 17, 2023 at 3:18 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,256 POSTS
Yes it will, I have used it many times.
Jan 18, 2023 at 2:26 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.