Hi everyone, I tried searching, and found alot of stuff on my engine, but not for my purposes. I'm building up a roller cam Vortec 350 engine, fuel injected - likely going to set the rev limiter at 6k (maybe 6200). Manual transmission, for any difference that may make. The car will likely see less than 5k miles a year, occassionally driving it around on small errands once a week or every two weeks or to car meets and such, but really hammering on it at the track (1/4 mile racing). On a GM performance forum there's a few guys that add superfine molybdenum to their oil about every 40-50k miles, and have seen huge reductions in part wear. One guy who has been doing it for about 20 years adds a tablespoon of it in with dino oil with a fresh engine, runs it a few thousand miles, drains it, tosses in synthetic with a teaspoon of the stuff, and then just does normal oil changes, adding a teaspoon more, as I mentioned, ever 40-50k miles. I'll be doing the same, but as I've seen in alot of threads here, some engines like certain oils more than others (even if they have identical weights). Does anyone have any recommendations for me on oil and weight? It's been suggested that I use 5w-30 (after reading some stuff here, I'm wondering if that guy was messing with me or not... especially in some of the thick vs. thin threads). The builder and I are figuring that the engine will be putting out about 550HP at the crank, using 100 shot of nitrous - again I'm mentioning it just in case it has any impact on recommendations. Filter wise I was just going to go with the Mobil 1 unit, again unless anyone has some better recommendations. Thanks everyone! And I apologize if I did miss a thread covering a similiar setup to mine with the same question.