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Because the oil has to warm up to be registered. If it's a pressure guage, it may be that the viscosity of the oil is too high. Try switching to 10W40 or 5W40 weight oil.

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18y ago
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Q: When the engine is cold and I start the truck the oil temp gauge does not register but it does after you drive about a minute 2001 Mazda B3000?
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