09 Supercharged Yais Oil Analysis

[vten]

Looking good Scott.

So should I do the 3500miles interval as well instead of 5000 mi ? Since I'm using the synthetic valvoline as well ?

[CTScott]

Originally Posted by vten

Looking good Scott.

So should I do the 3500miles interval as well instead of 5000 mi ? Since I'm using the synthetic valvoline as well ?

Not necessarily. I "learned" to change oil every 3,000 miles, so it's just my mind set. Blackstone said that people running synthetic (and having them do analysis) on the 1NZ-FE average 6200 miles. If you want to know if 5,000 is OK, then just run a test with them and select the option TBN (total base number) report, which indicates how much of an oil's original additives are left. Over time that number will decrease. The TBN analysis will indicate if you should be changing it sooner than you are or if you could go longer with the oil. I suspect that If I paid the extra $10 for the test that mine would have been close to its factory value.