On a similar vein , at work we got two new transit vans with consecutive chassis nos, I ran one in , basically thrashing it from the start but keeping a close eye on the fluids and temp etc.
The second was run in by a colleague who drives like a total prat, never going over 50 mph, labouring it in gears and doesn't know how to raise the bonnet etc.
Mine was always 10 mph faster than the other one and accleration was better, it never used oil and had no engine problems.
The second one used oil and water and eventually dropped a valve and wrecked the motor.
Our s60 volvos are the same as were the K100's and the Pan Europeans.