I tried it and liked it for performance for the first 1K or so. but the MPG sucked.
It does seem more lively than most oils when new, but seems to "AGE" quickly. If being QUICK is more important that MPG then IMHO go for it and change every 1K. Otherwise, (IMVHO) Pennzoil SUV 5w-30... will be similar although slower but keep the MPG UP THERE.
There ARE oils that KEEP the engine CLEAN and do protect extremely well but they are not on the open market... none the less you should find all you need in most oils sold OTC.
I thought I read (here?) that it was largely group I and that group I had slightly greater cleaning ability (but less lubricity) than group II. Could that explain the sulphur smell? I do know the basic specs, flash point, etc. weren't that good.