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We have found our oils maintain sufficient TBN with use, as long as sufficient is maintained that is the important issue. Our additive package does react with surface oxides initially more so than some others. This is a reaction on the surface as the additives are reacting and protecting the surfaces. These are not actually wear metals but surface oxides, with extended use these levels tend to drop. I wouldn't say that 25ppm is excessively high or of a reason for concern.
Extended drain intervals and low wear are certainly both important characteristics of our products. The test results are particularly accurate, using these inexpensive tests to compare products, trying to determine superiority can be problematic and lead to erroneous conclusions. They are designed to spot and track trends in fleet use.
Due to the improved thermal stability of our product, we would expect one of the benefits would be superior cleanliness.
Regards, Dave
Red Line Oil