This was the subject of an S2000 TSB. Don't think the S2k has an olm system though.
Quote:
Because the piston rings, piston rod bearings and crankshaft main bearings continue to “break in” during the first 5,000 to 7,500 miles, factory-fill oil is provided in the engine of the delivered car. The factory-fill oil has special additives, so it should be left in the engine until the first oil change: 7,500 miles, under “Normal Conditions.
If the oil is changed at 3,500 miles because the car was driven under “Severe Conditions,” replace the factory fill oil only with 10W-30 petroleum-based oil.
Do not use any synthetic oil for the first 7,500 miles. Synthetic oil is excellent protection for the car’s engine, but it should not be used before 7,500 miles since it will not allow the rings, bearings, etc. to “break in” properly."