I have an 2008 Tundra 5.7, when the engine is cold, the oil pressure guague needle is at L, when it's warm up, it's in between L and H, everytime I step on the accelerator the needle goes from the middle towards H, the deeper I step on the accelerator, the farther the needles goes toward H. I went to 2 different dearler service, they told me it's normal, but can't explain why when I got the truck brand new, it never do this. Now the truck has 70K miles. Any ideas? Thanks.

Did you change filters or brands on oil? My 2005 reads different with different types of filters or oil (syn or Dyno)

The oil pump is RPM dependent. The pressure fluctuation is normal.

normal