Originally Posted by rdsabin
My 2010 Ram takes 5W/20W which is a blend, my 6.1L requires 0W/40W synthetic. (Mobil One)
I know my dealer charges less for 5/20 than they do for Mobil One, either way it is still cheaper than having to replace an engine. In my case I don't put many miles on my vehicles any more so they get their oil changed once a year, which is about 2-3.5K miles each yearly.
I'm assuming you're speaking of a synthetic/conventional blend, correct?
Please don't waste your money on synthetically blended oil. It's not only an oxymoron but it's a joke. They are notorious for a common automotive term called "gel forming." Google it or ask a reputable mechanic.
Either stick to conventional [petroleum based] or run a "true" synthetic [which actually is, regardless of what people tell you, also patroleum based with more uniform molecules]. With synthetic motor oil now readily available, and really not that much more than your conventional, it defies the principles of logic why anyone would not switched to, and run, synthetic.
Hope this helped