Run this:
HPL Engine Cleaner is designed for those who wish to clean deposits in their engines left behind from commodity type lubricants that are designed to “meet the spec.” Engine Cleaner is specially formulated and fortified with detergents and dispersants providing safe cleaning in the engine. When...
www.advlubrication.com
or this
High Performance Lubricants’ Euro passenger car engine oil is a multi-synthetic high performance motor oil made with the best choices of additive chemistry. This series takes advantage of high quality PAO base oils delivering superb pour points as well as an advanced VI Improver that has...
www.advlubrication.com
change your filter often. I would’ve suggested that you clean what you can before putting the cover back on, but now that it’s on, clean it slowly by using an oil (linked above) that works well for cleaning. Because it works well, the filter will get loaded up quickly. I’d change the filter every 1-2,000 while you clean it up.
See these threads:
This is the Fram Ultra filter element from our 2013 Hyundai Elantra with 115,000 miles on the clock. The oil is HLP 5w-20 HDEO that was in service for 10,000 miles the filter was also in service for the entire 10,000 miles. These pictures reinforce the need for a filter change or two during a...
bobistheoilguy.com
Previous UOA: https://bobistheoilguy.com/forums/threads/dodge-durango-3-6l-hpl-5w-20-21-079-miles-on-oil.344904/ This is a sample pulled from my Durango 3.6L with 137,615 miles total and 26,015 miles on the oil. Consumption was zero during this entire 26,000 mile run, which is a change from...
bobistheoilguy.com