GT-R turbos on the VQ37

rovert

With a Mocal sandwich plate, oil flow to the engine cannot be stopped.
The thermostat only restricts flow to the cooler, it does not restrict flow to the oil filter.
If the valve is jammed open oil will flow directly to the filter, by passing the cooler, then back to the engine. If it is jammed shut it will flow through the oil cooler first, then back to the engine via the oil filter.
In either scenario the oil returns via the oil filter.
The filter would be my first suspect in this situation.
Husam, did you change the filter when you swapped sandwich plates?
Just a bit concerned for you that the fix was a coincidence & it may happen again with catastrophic results.
Here is a link that explains how these sandwich plates work, it probably explains it a bit better than I do.
Cheers.

https://www.youtube.com/watch?v=l6Z2q-ttyOA

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08 Skyline 370GT SP Coupe 5AT: Diy TT

husam2012

I already watched that video among countless others researching this problem.. The only thing I can see is that I might of used a wrong oil filter stud causing the oil to never flow back to the engine after it is filtered. I did try 3 filters of varying brands before taking the Mocal plate off and it worked instantly afterwards.

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Creator of the GTR TT Conversion Kit, NA Record Holder (401WHP)
Ecutek Master Tuner (VQ37, VR30, VR38, B58, S55, S58)
BTWTuning

Optimiser

Wouldn't it be better to just delete the Mocal plate for now and go without it?
Also having to trial and error 3 different oil filters and not being sure about a stud seems risky to try and fix this problem.
Perhaps you might just need to take it to and expert shop at this stage so as not to risk anything further. Just a suggestion now you've got this far on this project.