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I have been researching oil for about 5 years, I only use three oils.

1. Schaeffer google it (best) they even send you a pill bottle looking bottle to send your oil in to be tested and they break it down chemically of what is in your oil, such as glycol, iron, aluminum, and where it could possibly come from. Most major taxi companies use this oil

2. Royal purple, great oil nothing much more can be said

3. Mobil 1

When i get my engines broke in i usually use a synthetic blend to get my engine and gaskets used to the smaller molecules of synthetic oil, after that i change over to full synthetic. At the time of full synthetic oil change i also change out the transfer case/trans, and the PIG (rear end) as well.
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