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.

use a good oil and you shouldn't need to use any additives,i'd throw in some HDEO like RTS or M1 TDT 5w40,it has boosted levels of ZInc,phos and cal to aid in your concerns about wear and would do your 5k OC easly and still be good for the winter use if your planning on using it in the winter.

good choice on filters too can't go wrong there.

I would go with a good 10-40 with that motor and those rpms.

Redline 10w-40 has worked out very well in my 355 LT1

what type of fuel injection, what vehicle?

I HAVE A NEW RAMJET 502 IN MY 93 K3500. I USED STD 10-30 WT DURING HE FIRST 600 MI. NOW I AM USING SYNTHETIK MOBILE 1 10-30 EXT. PERF OIL. IS IT NORMAL FOR A NEW ENGINE TO USE 1 QT EVERY 150 MI OF FREEWAY DRIVING. SOME SAY THAT IT IS NORMAL, OTHERS SAY USE A 15-50 WT SYNTHETIC. I AM TIRED OF PUTTING AN ADDITIONAL $5.00 EVERY 150 MILES. RIVERRUNDAD@AOL.COM

No, 1 quart every 150 miles is ridiculous.

Hey guys!

Thanks for the replies, and I'm sorry I haven't responded sooner! The engine is still being built and some things have changed... and for some reason I wasn't notified when replies were made (I made sure to check the "Watched thread" box.

To give some updates, we're getting rid of the Vortec heads and going with AFR 195cc heads. It's still going to be a hydraulic roller.

The fuel injection system when it's done will be MAF based, modified TPI (using a FIRST intake to overcome the small runner issue in stock TPI). In the short term the engine will be running a carb (nothing major, 650 holley, and probably an air gap lower intake).

Most of the driving in the car will be on the highway, and of course the hard runs at the 1/4 mile track, probably 90% highway, 5% track, 5% around town.

I live in North Carolina, so while it does get cold in the winter, I can't remember it ever getting below zero. I probably won't drive it as much in the winter, maybe for thirty minutes or so on the highway once or twice a week.

Again - I apologize for the late reply, and thank you guys for the input, any other suggestions or questions are welcome!

*EDIT* - in case it plays a part, the cam that is going is is Comp Camps 280XFI, which has a 230/238 duration at 0.50 (IIRC). It's a fairly agressive cam, though we'll be using 1.5 rockers instead of 1.6 to help tame down the lift just a touch).

+1 there couldn't have been a better recommendation . HDEOs work great .

Run a non syn oil.

Alright! Thanks for the reiteration and assurances Steve!

I'm looking at the Mobil Delvac 1 ESP. That *seems* to meet all the requirements you folks suggested. Am I correct?

Mobil 15w-50. Trust me, look at the UOA's on this board. Plenty of Z & P.

Good move with the AFR's, best SBC 23 degree heads out there.

(the mobil delvac will be sufficient as well)

+1, this is my recommendation also.

Apparently, GM Performance Parts ships it's high-performance engines from the shop with 20W-50 in them, and they rec. sticking with 20W-50 in them.

For an engine that sees 90% track time, maybe 20W-50 is the way to go...I'd probably go with Valvoline VR-1 20W-50, OR Brad-Penn
'Penngrade 1' 20W-50 race oil.

Thanks for the additional suggestions and info guys!
I'm using hydraulic rollers, instead of flat tappets, so I *thought* that meant I didn't need to worry about the zinc and phosphorous as much - or am I mistaken on that?

I figured I'll go ahead and try Mobil's Devlac 1 ESP 5w-40 stuff first, then after a few oil changes try out the Redline 10w-40 and see if there's any differences.

Thanks again everyone!!