M35x AWD V6-3.5L (VQ35DE) (2007)
If difference is extreme, check engine oil passage and oil pump for engine oil leaks.
7. After the inspections, install oil pressure switch as follows:
a. Remove old liquid gasket adhering to oil pressure switch and the mating surface.
b. Apply liquid gasket and tighten oil pressure switch to the specification.
Use Genuine RTV Silicone Sealant or equivalent. Refer to GI-47, "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS". See:
Service and Repair
Oil pressure switch: 14.8 Nm (1.5 kg-m, 11 ft-lb)
c. After warming up engine, make sure there is no leakage of engine oil with running engine.