To make a long story short, I've had trouble with the oil pressure on my 3.0 ever since changing the first engine out and have had to rebuild it 3 times. Always #5 & 6 rod bearings. Nobody has came up with an answer to this problem. Good oil pressure when cold but dropps to 0 after warming up. Now it has broken the flexplate. I was told that this could be cause by the crankshaft not being shimed to the proper size for the torque converter shaft size. This was a suggestion from a Nissan Tech but he didn't know for sure whether the Toyota was the same. I will measure this when I pull it this time but wanted to know if anyone knows about this problem are have other suggestions. Thank you for your assisance in advance!! Love reading your site and post!! 94 PK 3.0 Auto 4WD.