Oil pressure problem? please help?

5w-30 is a lighter oil weight is all it is. I would check your oil pressure sending unit, sounds like that may be bad. they're pretty cheap and easy to change yourself. either oil would be okay for your motor, winter 5w-30 / summer - 10w-40

No, the Oil type will not make a noticable difference in your oil pressure.

It is somewhat normal for oil pressure to drop when the engine reaches operating temperature.

Have someone put a manual gauge in a oil passage and get an accurate measurement of the oil pressure before you assume that the oil pressure is not sufficient.

if it recommends 5w-30 then that weight is the best for your vehicle. 2000 is a little too soon for leaky valves, gaskets, etc. especially on a YOTA. I would try to change the oil and see what happends. If not then check for any kind of smoke from exhaust. check if there is oil on your spark plugs. check for any obvious oil leaks first. if not then take it to a trusted mechanic.(if there is such a thing)

most newer engines require the thinner viscosity oils because of the tighter tolerances in the bearings.so sometimes using thicker oil could cause the engine to "starve" for oil and cause damage.Not knowing the milage of your truck.it could be a worn engine,but you might try changing the oil back to the recommeded viscosityand see if that cures the problem.

i could have pronounced it must be the stress swap apart from the rattle. the two mutually point out that it is not develop stress precise. this is achievable that the replace oil is purely too thick, in fact, no longer too skinny. it ought to in fact be the oil pump it fairly is going abode. you should do with somebody putting a suitable stress gauge on it to work out what's unquestionably occurring. back to the storage and demand on seeing them do the tests.

Rebuild the Eng;Bearings worn beyond limits;

i dont think so check ur oil sending unit and oil pump