Just began shopping for next oil change. Saw Mobil Super - Mobil Super Syn 5W-20 5 qt for $29.99 Each. Mobil 1 - Mobil 1 Synthetic 5W-20 $36.99 Each The Mobil 1 Super was a new one on me. which is best? Is the super better? is it a blend? It's cheaper. Is that an introductory price? It's guaranteed for 5000 miles - whooptido! they claim the Mobil 1 Synthetic 5W-20 is recommended for multi valve passenger car engines. Hmm are there any single valve engines around?