i started my car about a month ago and i noticed that the oil pressure gauge was jumping between 40 and 20 when i got on it any sugestions 1993 3.4 auto

 

You mean it was jumping from 40 to 20 while you was on it? Check the wiring connector to the oil pressure sensing unit. When was last oil/filter change? How hard was you getting on it? Car running fine otherwise? I have seen engines with a bad bearing causing the oil pressure to jump around. Not saying that is your problem, not enough info to come to that conclusion.

 

about a month and a half was the last oil change with 10w 30 i was just taking off from a stop sign and it was dancing around a buddy of mine had told me thats just what these cars do wiring seemed okay for the year

 

IDK, I don't think oil pressure jumping around is a common thing with these cars. Higher oil pressure at cold startup with it decreasing as the engine warms is common on alot of vehicles with some engine wear. I would think if the oil and filter is good, everything else is normal, you could have a sending unit going bad, corrosion on the wire connections etc.

 

lets hope that is the problem but the engine really dosent seem to be doing that bad

 

why does everyone put 10w-30 in there car when it calls for 5w-30 change the oil and filter and the oil pressur sending unit ....its right above the filter whith a rubber casing over it 15 $ part and the car requiers 4.3 quarts of oil thry that id that dont work it could be a worn oil pump or other thing but this would be the most common and cheapest fix

 

if the motor is getting old and losing oil pressure the thicker oil (10w30) will bring the oil pressure up and help in the short term. the oil pressure sensor is by the oil filter on the 93 3.4, thanks. had to look it up in the book.

 

Because that's fine for a newer, tight engine.
And because that's another way car manufacturers can get better gas mileage and performance out of an engine. It takes longer for thicker oil to run off the rotating mass, which robs h.p.
"Calls for" means "recommended", not "have to or else".
As the engine wears, so do the bearing tolerances, and you can notice your oil pressure not being as high as it once was. So jumping up to a higher viscosity will raise your oil pressure. Doing that won't harm the engine, look at it as wear compensation. And it doesn't mean your engine is on it's last leg either, you could go years and years like that. But once you work up to needing to run straight 50w to barely keep pressure, start counting the days.

 

thanks everybody i went and ordered the part and hopefully the problem will be fixed