I use Mobil 1 10W-30 only. However, on my current NSX I will reach the time interval before the mileage interval, so I will have to change out the break-in oil.
Researching S2K forums, looks like they sent some Honda break in oil for an oil analysis, and an oil engineer figure how to mix some oils and additives to mimic the Honda break-in oil:
- 4.5 Quarts of Havoline 10W-30 GF-4 Dino Oil
- 1 bottle of Valvoline Synpower Oil Treatment
- 1 ounce of Lube Control
I mixed 10 quarts worth last night, and made a mess!