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Originally Posted by MikosV6
Well, it's cheaper (for them at the factory) to run a synthetic "blend" than a true full synthetic like Mobil 1 like they already put in the Corvette. Of course, I certainly don't want to get into a blend versus full synthetic debate with you. I have enough problems trying to convince the V8 owners on here that V6er's have "real" Camaros too.lol!
However, if given the choice, I'm going to run a full synthetic in mine, not a blend. The advantages of running a full synthetic far outweigh the disadvantages. The Dexos blend is just GM's way of cost cutting at the plant for the factory oil fill.
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If it matters any, I'm supposed to be running 5W20 semi-syn, which I did for maybe 15,000 miles before stepping up to 5W30 full syn (same brand). Let's just say I came across a clear warning to not use 5W20 in a certain family of engines from somebody who was quite close to their development.
But I don't know anything about the Dexos spec, what it's intended to be specifically formulated for, or what it takes to get the Dexos approval or stamp.
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They don't recommend against a catch can, but they don't promote it either. In fact, I've read that some dealers could give you problems with a powertrain warranty issue if you have one installed.
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Of course they aren't going to be caught promoting something that they didn't put on the car on the way down the assembly line. That'd be begging for trouble, pure and simple.
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Everyone knows that D.I. engines are prone to intake valves coking up after so many miles on them. So, in turn, they get to profit off you for another service called the "induction service cleaning" procedure to get rid of something that wouldn't have occurred in the first place if you had a catch can.
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I suppose that would give their dealership service departments a little more ammunition to pressure folks into getting that and various other 'flushes' performed. Although it might be questionable to charge for doing so if emissions were adversely affected and the existence and payment responsibility for such cleaning not disclosed during the purchase process.
Norm