OIL PRESSURE GAUGE

DAVE AND ALEX · Post by **DAVE AND ALEX** » Mon Mar 29, 2004 8:23 pm

I am in the nz mx5 club and have a 1992 mx5.
the question i have is about the oil pressure gauge in the car.
when the car is cold the gauge reads 5.5 to 6 at about 3000 rpm thats
good. oil cold but when car is hot and going about 100 kph about 3000
rpm oil pressure goes down to about 2.5 to 3 on gauge.is the gauge right

garethkemeys · Post by **garethkemeys** » Thu Apr 01, 2004 12:59 pm

When oil is cold, it is thicker. The viscosity of the oil being thicker cause the pressure to read slightly higher. When the car is hot the oil is thinner, less viscous equaling less pressure on the gauge. It should be fine.
[...]

Janet & Jeff Curtin · Post by **Janet & Jeff Curtin** » Thu Apr 01, 2004 4:11 pm

Same as mine I think the perssure drops as the oil gets hotter and
thinner.

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Bill Rehm · Post by **Bill Rehm** » Thu Apr 01, 2004 5:32 pm

That's correct --- and I'm not even one of the list's tech savvy experts

Regards
Bill