Actually, I agree with Diesel Head regarding oil. If you are going to change your oil every 3000 miles any diesel rated oil of the correct weight will be adequate. The main advantage of good synthetic oil is longer oil change intervals (I go about 5000 miles) and the availability of 5W40 which provides easier cold weather starting and better cold lubrication.

No one is going to prove an engine failure due to inferior oil, any effects will be subtle and may show up after many miles (maybe more timing change stretch or shorter bearing life). Certainly, "running the s**t out of it" will affect the engine life more than the quality of the oil. If you abuse it long enough, you will eventually have a non-oil related failure anyway.

However, oil is very cheap and driving around at 4000 rpm is pointless.