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#6: 03-18-2013, 02:03 PM
 
 Tooslick
Title: Junior Member
Location: Dixie
Car: 2011 Subaru/2002 Audi TT Quattro
Posts: 64
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Dennis,

I haven't done the testing in my personal vehicles to really tell how long this stuff lasts. The starting TBN's are in the 5.5-6.5 range, however I suspect that TBN retention is very good. I may have to try the Amsoil 5w-30 Euro Formula in the Audi TT to get some actual test data....

TS