The type of sealant used should have been quite apparent on removal. If the fastener doesn't seat against anything and isn't a taper thread, it requires an anaerobic thread locker to lock and seal against the oil pressure. Loctite 242 is rated for 100% strength in motor oil at 125°C. I had to look how the preapplied stuff works. It contains micro capsules which burst on installation to release the chemicals which do the work. Loctite has a product specifically for this application.
To have that much of a leak, it has to be pressurize oil, not just a crankcase leak. The crankcase should be below atmospheric pressure, so other than seepage shouldn't leak significantly.
As far as the crank sensor, the o-ring does the sealing. The single bolt has no influence on the seal. If you are concerned about it leaking, pull it and inspect the sealing surfaces and o-ring for damage. We trust o-rings for virtually every other far more critical connection under the hood.
To have that much of a leak, it has to be pressurize oil, not just a crankcase leak. The crankcase should be below atmospheric pressure, so other than seepage shouldn't leak significantly.
As far as the crank sensor, the o-ring does the sealing. The single bolt has no influence on the seal. If you are concerned about it leaking, pull it and inspect the sealing surfaces and o-ring for damage. We trust o-rings for virtually every other far more critical connection under the hood.
