[crowejim]

There are sound scientific reasons for using a 50/50 mix of anti-freeze/water. Water conducts heat more efficiently than anti-freeze. Your engine will run cooler with pure water. However, you need the antifreeze to raise the boiling point, lower the freezing point, and prevent corrosion.

There is no valid scientific reason to prefer a blend oil over 100% synthetic. Synthetic is simply superior to dino oil. If dino oil were just as good, GM would recommend pure dino instead of a blend. Having said that, blend oils are good oils and will do a fine job. However, dino oil produces ash, which manifests itself as gunky deposits. Dino oil also contains many times the level of impurities, which cannot be refined completely out.

Remember, by using a blend, GM is saving a buck or two on every car they sell, which adds to a lot of additional profit for them.

Not trying to start an argument here - just pointing a few things out.