oil pressure jumped after oil change

[ranchos]

2005 tahoe q4sf/4.3l merc v-6, change oil (25-40w) & filter thursday, ran it on mouse ears no leaks(filter) must be good to go, at lake 2 days later 2 600am, got rpm's to 3000 up to 3800, oil pressure guage at 80psi, after a bit (time to get oil warm) backed down to about 42. stopped fished for while did same. rest of day didn't do. ran it today at home on mouse ears up @ 3000-3200rpm oil pressure guage would kind of jump up to @ 60psi when move throttle from 1000 to 3200. oil level on dip stick fine. what do you folks think?

 

[Don S]

Re: oil pressure jumped after oil change

oil level on dip stick fine.

Does this mean that is was not too low and to high.
High oil levels (over the full mark) can create it's own problems.

 

[ranchos]

Re: oil pressure jumped after oil change

oil level on dip stick at full mark, not over-ful

 

[Bondo]

Re: oil pressure jumped after oil change

Ayuh,...

I would Expect the Cold oil pressure to be considerably Higher than the Warm temps...

 

[Seadooman03]

Re: oil pressure jumped after oil change

If your comparing your old oil pressure to new oil pressure, you have to remember that your old oil..(depending on how old it was) becomes less viscous, which would cause lower oil pressure as the oil breaks down and becomes polluted with fuel. New oil is thicker, and until it starts to thermally break down, you will have oil pressure spike. Especially when the oil is cold, due to the outside temperatures. From my understanding, as the oil heats up, the pressure comes down, which is normal. However, if your oil pressure did NOT come down, then you may of had a problem.