I still say that with a good synth oil, why throw your money away by doing 3K intervals. You can make yourself feel good all you want, its overkill. But if it allows you to sleep at night, by all means.
I'll stick with 5K, and I'll continue to recommend 5K intervals for this motor.
FYI...
On a 1.8t, we did a blackstone UOA on redline 5-40. After 5,750 miles, it came back great! They even told us to run it to 7K and resample. The car has 115,000 miles they said everything was great. The car drives great.
FWIW, Redline and Elf are both really, really good "cleaning" oils. Meaning they have detergents in them that cleans the crap out of the engine. So if you are switching to either of them after using something else for a long time, the first drain will be VERY black, and I recommend that you don't go the full 5K. But after that, have at it.
In other engines, not as harsh as this, a good snyth should go 7500-10,000 easy.
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