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I run Delvac 15W 40 in the Tahoe and Rotella syn 5W-40 in the Dmax. I am using an Amsoil EAO52 oil filter, AC Delco filters are fine as well.

Change your Allison spin on-at each oil change. The tranny fluid change interval I believe varies by how hard you use it, check your owner's manual.

Don't forget to lube the front end. There are 11 zerks in all.

The turbo takes advantage of the energy available in the expanding exhaust to spin a compressor and pressurize the charge air. This provides for more oxygen in the charge and allows for more fuel to be burned = more power.
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