I'll throw in my 2 cents: I've read and researched synthetic oil extensively, and while NOT a lube engineer I’ve found that a “full synthetic oil” like Mobil1 or Pennzoil Platinum will resist breakdown due to heat, better than petroleum based oil, do a better job at containing and suspending ‘sludge’ in the motor than petroleum based oil, and do a better job of lubricating in some situations (as in 5-8 years ago Ford had under-engineered oil flow channels in a V-8‘s block that encountered issues where petroleum based oils had a harder time flowing). I use a “full synthetic” in all of my cars. However, it is crucial to note that years ago the very definition of “full synthetic” was changed so that oil companies can label a given oil as “full synthetic” while is it in fact, NOT full synthetic – just mostly synthetic (the actual % will remain a closely guarded secret). However, there ARE companies that offer a completely FULL SYNTHEIC oil (AmsOil being one of them) that are 100% synthetic. As anyone who has compared prices will know, a quart of AmsOil costs significantly more than a quart of, say, Mobil 1. I have used AmsOil in all my motorcycles with excellent results. However, I find that while oils like Pennzoil Platinum and Mobil 1 are not FULL synthetics, they do a good enough job for what I require in my road cars. My 2011 Ecoboost motor came with Ford’s Motorcraft Semi-Synthetic in the engine. At 5,000 miles I switched to Motorcraft Full Synthetic because A) I’ve seen how hard it is to do a DIY oil change on an F-150 Ecoboost, B) Want to let my Ford dealer do it to retain the warranty, and C) After doing some research, I found Motorcraft oil is actually a very, very, good oil. As you all have seen from other forums, the oil debate is endless, but I felt that living in Houston, Texas with the types of driving my Ecoboost will see, that Full Synthetic oil was a better choice than Semi-Synthetic, etc. While AmsOil is one of the, if not THE best oil you can get, the advantages weren’t worth it in my particular situation.
Last edited by Skeezix; 01-26-2012 at 12:36 PM.
Reason: Spelling error found