I use the Motorcraft oil from Walmart along with Motorcraft filter on the Vegas. I also do not routinely go full 5000 miles between changes. I will got to almost 5000 if unit is on long trip.
I drag race, build my own engines, transmissions and rear axle setups. I am not fond of using full synthetic oils in most engines based on what I see on rings/cylinder wall finish. I have also seen on GM LS style motors a big increase in oil consumption when full running synthetic oils at higher miles. My current 07 SUV has 145,000 and I use Castrol GTX 5-30W conventional. Consumption is 1 quart every 2,000 miles.
In my commuter car I do use Mobil1 0-20W and a good filter.
In all the years, I have yet to see a real, genuine oil related failure.
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