Well being that I'm overseas currently and I haven't driven the truck long enough to warrant an oil change yet (though it will need one before I return), I'll probably stick to what I've used in the past. Mobile1 with Mobile1 full synth.
That begs a question (please don't flame me for asking here, I just need a simple yes or no answer) but is full synth necessary on my N/A XR? I had a turbo Mazda last time and that's why I went full synth. I also hear once you go full synth, you need to stay full synth and that shit is expensive.
FYI Mobile 1 ISN'T a full synthetic oil:top: They use a conventional base stock instead of synthetic base stock. Only Amsoil, Redline, Royal Purple and Castrol use pure 100% Full Synthetic Oil. I may have missed another Full Synthetic oil:hmmmm2:.
U can switch to synthetic anytime u want and switch back to conventional anytime u want and even mix them 50/50, that's why there's synthetic blend oil it's half conventional and half synthetic and half the price of full synthetic. The only issue one could have with using synthetic is if u already have an oil leak, it will actually leak more because the synthetic oil molecules are smaller the conventional molecules allowing them to pass thru smaller passages.
You don't need synthetic. It is a matter of choice.
Sure u don't have to and there's plenty of proof with tons of cars/trucks that have 300K+ in miles on conventional oil. But if u can afford it use it, it's far more superior then conventional oil and with the detergents that are used keeps ur motor cleaner. It's also much more slick then conventional oil.