Originally Posted By: irv
Most on here know my personal thoughts with regards to Mobil oils so I won't get into all the reasons for that other than to say I think Mobil oils are overrated and overpriced. Will your engine grenade using Mobil oils, I highly doubt it, but I honestly believe many oils exist out there, including Pennzoil, my oil of choice, that are not only cheaper to purchase, but are also a better product.
Overpriced as compared to what? M1 is and has been the cheapest at WM versus Pennzoil or Castrol. Better is subjective and you would not be able to prove that as a consumer unless you have several hundred thousand in disposable cash. Bottom line is that none of them--Castrol, Mobil, or Pennzoil are bad choices and to discern the differences between them for engine longevity is a near impossible task.