Preventive timing chain and guide replacement on an N20 with known history of this failure mode is genuinely worth considering before codes appear. The cost of the preventive job is a fraction of what a jumped chain costs in engine damage.

Borescope inspection combined with an oil pressure test is exactly the right diagnostic approach before anyone mentions camshaft or lifter replacement. Metal particle check on the drain plug magnet during your next oil change is also worth doing as a first step.

Bro I feel this post in my soul. I spent two summers chasing down leaks in our chemical storage area before someone pointed me toward Crateco. What sold me was that their drums are made from HDPE and go through actual pressure and drop testing before leaving the factory. In a 40 plus degree warehouse with lubricants that expand when warm you need…

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