Ok heres the story, just bought a 88 vert last monday. Drove it and paid close attention to the oil pressure in it.

I always change my own oil, but had a free coupon for the Mazda dealer, I thought what the hell , no one can screw up an oil change.

Well heres how it went, I go in to get it done, and when I leave, I notice my oil pressure is like around 50 or 60 pounds at idle, and like 90 at 3k. After a minute of idleing, it goes back to the normal 20-30 psi. I guess its ok , but it kinda scared me at 90-100 psi at 3k, when it first started after the oil change. I never seen it any higher than 70 psi. Well anyways the ****** put 5W-30 in it, I always used 20W-50 summer, 10W-40 winter or as Mazdatrix recommends in my first generation cars.

So basically my questions are:

1) does weight a viscocity affect oil pressure, and if so how?
2) And what is normally regular oil pressure in one of these?

THANX

 

The fsm at http://www.iluvmyrx7.com Lubrication System, page 2-5 says 3000rpm, 64-78psi. Using a mechanical gauge.

 

So does anyone know in what way oil weight affects oil pressure?

Thanks for the reply on the normal pressures etc...

 

Oil weight or viscosity is basically the thickness of the oil. The thicker the oil the more "resistance to flow" the oil has. I would think that the thinner 5w30 they used if anything would cause a lower oil pressure. I base this on the fact that as oil warms up and gets thinner the oil pressure will be less then at a given RPM of when it was cold.