Mobil 1 has been a favorite with those interested in cleaning out the system. I personally like Castrol Edge a little better for easily-obtainable class IV synthetic, RedLine is the best IMO but not available many places, Amazon.com comes to mind.

Look out for "full synthetic" labels, many of them are hydrocracked dinosaur oil, aka: Class III synthetics, different than the old definition of full synthetics. Mobil 1 for example: Turbo-Diesel & Truck is what I run in my gasser and diesel Mercedes E320s, a class IV synthetic, as is Mobil 1 Extended Performance, but the regular Mobil 1 oils are now downgraded and re-formulated and are only Class III synthetics like many other cheaper-basestock oils including some of the Amsoil products.

I do not believe in engine flushes, there is risk. Good oil like Mobil 1 TD&T will clean out that engine in a change or two and is gasoline engine rated as well as diesel, plus the 5W-40 rating works for your climate.

In the transmission, go syn if you want to, I see less benefit there unless you're running it hard. Do NOT NOT NOT have the trans fluid changed by anyone with a flushing machine type of change, unless you want your next stop to be a transmission repair shop. My friends with transmission shops love businesses with those flush machines, tell me that they generate a lot of business for repair shops. It is a quick way to do a change, not a good one, the proper and safer way is to drop the pan, keep it CLEAN with no lint and NO PAPER TOWELS, new filter and gasket, drain the torque-converter also, don't over-fill.

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Gone to the dark side

- Jeff