OK - just got back from a week-long RV trip, and found the results of my last oil analysis had arrived while we were gone. The analysis displayed below is with 10,000 miles on Delo CI4-Plus 15/40, and the sample submitted was immediately after another 500 mile RV tow with lots of mountain towing involved - the sample is on oil that's been in the engine for nearly a year, and a wide mix of driving situations, from empty and around town, heavy towing, and both zero degree winter weather as well as 100 plus degree summer use. Several Frantz cartridge changes were involved, and about a quart of makeup oil added to compensate for what the filter element absorbed - there was no actual oil used (consumed) by the engine.
Here's the report, showing the first 5000 miles on the oil, then 10,000 miles on that same oil - the engine has about 55K miles on it:
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And here's the particle count on that same oil:
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This is what I would consider as about average for this oil, my bypass filter setup, and my specific engine - not a "spectacular" report - but a good one on an engine that is now pretty well seated in and worked pretty hard at times in RV towing in mountainous terrain.
The 2 questions to be addressed here are, how will this report compare with others using different bypass setups at similar miles and usage - and how will it compare with the new CJ series of oils that we're having forced upon us?
Every owner is entitled to their own choice and opinion - MINE is that I'm very happy to be using the "old, obsolete" Delo CI4-Plus lube, and the Frantz bypass filter!

