I would be weary of switching to synthetic if you don't have the previous owner's documented work. Anyone disagree or agree?

I just switched to my winter weight 10W-30 oil. I normally run 15W-40 Shell Rotella, but because Walmart only has Rotella in a synthetic blend 10W-30 (and I don't really need the extra cost in the synthetic blend) I switched to Mobile "Super" 10W-30 high mileage, and I must say that it smells GREAT! It actually smells exactly like castrol high mileage, so it must be the additives and seal conditioners.

We'll see how this oil holds up.