Do I put sealant around the oil filter housing gasket? and a bolt stops screwing in.

[MINIR55]

Hi there,

My previous thread <Help to diagnose reasons for white smoke and oil leakage. (bimmerforums.com) (https://www.bimmerforums.com/forum/showthread.php?2484273-Help-to-diagnose-reasons-for-white-smoke-and-oil-leakage)>
I replaced both the oil filter housing gasket and oil cooler gasket purchased from a dealer. I torqued oil filter housing mounting bolts to the required measure 10Nm.
After I drove a while, I found leaking coolant from the outside engine block to the ground. I did not remove oil filter housing from the engine block and torqued a little more to 13Nm directly. There is no obvious leaking from the engine block. After I drove hundreds of miles, I was aware that the coolant level in the coolant expansion tank drops to the middle between min and max marks. I also found there was condensation water in the tailpipe exhaust after driving a short distance. There is maybe a very slow leak in the gaskets.

By the way, after I torqued the bolt to 13Nm, there was one kind of squeezed noise when I uninstalled oil filter housing top and bottom bolts. I over-tightened the bolt, don't I? Could you share your experience to torque the four bolts?

I used a Pittsburgh feeler gauge and a stainless Westcott ruler on the oil filter housing surface. I found that it is easy to insert a 0.08mm (0.003") blade into the gap under the ruler between the coolant passage gasket and the oil passage gasket position in the long direction shown in the picture. It is a little harder to insert a 0.15mm (0.006") blade to insert the gap. If both gaskets are in the grove of oil filter housing. there is a gap of 0.38mm (0.15") or 0.35mm (0.14") under the ruler.
It is possible that the coolant flows downward into the oil channel and then exhaust to the tailpipe. Do I put Permatex sealant around the oil filter housing gasket? Please share your experience and suggestions.

I have another headache problem. When I installed the oil filter housing again, I found that a bolt is hard to screw in. I stopped the installation. I may screw in the other three bolts by hand except for this one shown in the attachment.
What is wrong with my engine block bolt hole? How to fix the issues? Could anyone share your experience and suggestions?

Thanks

[bluptgm3]

No sealant.

[MINIR55]

No sealant.
The measurement for the M6 bolt is 10Nm.
I reinstalled the oil filter housing and torqued bolts to 10.2Nm first. and then I tried to torqued it to 11.6Nm. My torque wrench made the “click” sound immediately at 11.6Nm setting almost without moving the handle. Today I fill coolant and run the engine. Coolant leaks from the oil filter housing to the ground and exhausts condensation water in the tailpipe.

Any suggestions for this dilemma?

[bluptgm3]

It is not advised to add additional torque to a previously torqued fastener.
The most accurate approach is to loosen a fastener ~3/4 of a turn and apply the new set value dynamically.
When starting from an already torqued position the amount of force/torque to move from static-to-dynamic motion is relatively high.

In this case these are steel (?) fasteners threading into softer aluminum block and should not exceed documented torque value.

Possibly a first step is to chase the threads with a tap.