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Hi,
The Hard Break-in advice is aimed specifically at engines, but these aren't the only components which break-in. The Transmission, Brakes, Wheel Bearings, Bushings, Shocks, Fuel Pump, Oil Pump, Coolant Pump, Alternator Bearing, etc. all establish wear patterns during this critical period. Easier is better in my experience.
On an engine rebuild, the scenario is different and a Hard Break-in is more appropriate. But you're only dealing with the engine and not the entire unit.
Using Mineral Oil during the break-in was done at a time when Synthetics were thought to be more slippery, which just isn't so with todays better refined organic Oils. Also, it was cheaper to replace.
No one has ever suffered from following the manufacturer's advice on the break-in. Stick with that. I'm not even going to go into what Salesmen do or do not know...
Happy Motoring!... Jim'99
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