I noticed that Toyota's 0w-20 synthetic oil has a starting TBN of about 6, yet it is recommended for 10k oil changes. Some of the low SAPS oils for Euro cars also have very low starting TBNs.
If I want my engine to stay clean for the duration of the 10k long drains, should I start adding BG MOA (or a similar additive) to supplement the oil's detergent package?
If I want my engine to stay clean for the duration of the 10k long drains, should I start adding BG MOA (or a similar additive) to supplement the oil's detergent package?