taxreliever
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Maybe depending on operating conditions & load (think Death Valley July towing 15K daily) but generally for most dd users you will not see a difference.
No you will not have more oil at your next oil change. Currently you are using a "semi-synthetic", the switch to a "full synthetic" (Group III, IV or V) or "full conventional" is not going to appreciably change your engines oil comsumption. The only thing that would change your oil consumption by changing oil types is if the "new" oils chemistry causes new leaks in your engine and the odds of that with todays oils are slim at best.
A much greater effect on the dd oil consumption is the choice of oil viscosity, low viscosity oil use generally results in higher consumption levels, and less barrier protection under load.
A synthetic oil (Goup III, IV or V) has and advantage in extreme cold (Alaska) and extreme heat (Death Valley). The advantage to synthetic oil in extreme cold is that it is more stable & flows better in low temperatures than dino oil. This is one of the main reasons synthetic oil was developed. In extreme heat synthetic oil has a higher flash point (important for turbine engines) and has better "barrier" protection than dino oil.
Manufactures specify low oil viscosity to get a slight uptick in mpg which is important in meeting government mandates cheaply and it also will increase engine power output slightly but at the added cost of more wear. The specification of low viscosity oils by the manufactures has resulted in the increased use of "semi-synthetic" & "full synthetic" oils in order to meet the minimum lubrication requirements of the engine, since most dino oils at 5W-20 etc do not have the stability to work consistantly under normal driving conditions.
Ryan this is a quick Cliff Notes version hopefully it helps.
Wow, good information...thanks!