quote:I wonder how you come up with this stuff sometimes.
Originally posted by JohnBrowning: Dipstick, If you want a blend I would buy Mobil drive Clean and mobil-1 synthetic. Mix the two 50/50 and you know what you are getting. You will end up with a higher concentration of true synthetic in the engine. Most blends are not true synthetic blends and in the best case you are only getting 20%-30% group III witch is not a true synthetic. If you are going to keep changeing every 3000-4000 miles you might try Walmart brand synthetic. It is cheap enough that you would not mind draining it out every 3000-4000 miles! You might also true Chevron Supreem or Pensoil Pure base. THey are group II+ base oils and are preety good!
quote:I remember asking someone at Amsoil about the difference between their blend and their 15w40 synthetic and was told that the blend was 75% synthetic. I do not know if he meant that it was 75% of the amount of synthetic in their regular oil or if it was 75% of the total oil. He said that was the reason that it wasn't priced much lower than the all synthetic.
Originally posted by MolaKule: The only true synthetic blend of which I am aware is Schaeffers. Their PAO concentration is approx. 17-25%. No guesses here. Their Dexron III ATF has to be the best ATF blend going in terms of smoothness of shifting and thermal stability (VI of 190) and oxidation stability.