Originally Posted by
PeeBee
I am wondering around the oil pump and it being worn on the basis when the pressure increases the engine comes good? I did have a subaru that did the same thing - sorry similar - and it was valve guide stems seals of all things . I would change the pressure transmitter first, look at oil condition - assuming you have not changed anything, the ambient temps where the behaviour starts. Unsure where the oil pump is and if you can get to it . For a test you could add an oil fortifier to make it thicker and see if the pressure increases and improves? Just cant put the bearings into the picture??