a/c man

Yes a tone louder but same inside car it did smell on start up then my tuner Brett fixed that by leaning it out at idle it's fine now

Forcedvert

That's good to know about the smell , as mine is a convertable, as far as noise I can always upgrade the sound system, after the tranny and tires of course.

Corvette0096

Buddy has a 903 Sonny Leonard racing motor in his car and Sonny says to use Rotello.. This is a $100K motor. And I have no financial gain by letting you know.

C66 Racing

If your bearing gaps are stock, and you are not tracking the car and getting the oil very hot, I'd consider this:

AMSOIL Z-ROD 10w30 Synthetic Motor Oil (Product Code ZRTQT)
(zinc – 1440 ppm, phosphorus 1320 ppm)

AMSOIL has higher viscosity oils with lots of ZDDP, but in general, I wouldn't use a higher viscosity oil if the oil temp is "normal" which I'd say is under 250F assuming your bearing gaps are stock.

AMSOIL SAE Synthetic Premium Protection 10w40 (Product Code AMOQT)
(zinc – 1378 ppm, phosphorus 1265 ppm)

AMSOIL Z-ROD 20w50 Synthetic Motor Oil (Product Code ZRFQT)
(zinc – 1440 ppm, phosphorus 1320 ppm)

For what its worth, I have forged pistons, piston rods in my LS6 making 410 RWHP and run AMSOIL's Dominator Racing 10w30 at the track. Stock bearing clearances and my oil temp is typically 245-255F at the track. The Z-ROD 10w30 is very similar to the Dominator 10w30, but has enough detergent/dispersant for ~3-5K oil change intervals whereas I change the racing oil at about 500 mil intervals.

More than happy to get AMSOIL products for forum members at dealer wholesale pricing, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.

Forcedvert

Thanks for the specifics on the oil, tons of options out there makes it confusing sometimes exactly what specific oil is being recommended.

Forcedvert

Thanks for info,

I assume he is using the non synthetic types? I'm sure that motor is not on the street with cats... But this brand keeps coming up in many posts, now to figure out if I use it, which one?

Corvette0096

No this is a race car.. Its like $13 a gallon non synthetic

Corvette0096

This spring I'm going with Shell Rotella® T6 5W-40 My turbo lines are small with reducers.. 5w-40 will flow better at lower temps.

C66 Racing

That is not really correct except in extremely cold temps which most cars will not see. In more normal "cold" temps, a 10w30 will flow much better than a 5w40.

The 5wX and 10wX are not well understood.

These specs are per SAE J300, last revised in April 2013. Per this spec, 5wX is defined by low temp cranking viscosity (ASTM D5293) max of 6600 at -30C and low temp pumping viscosity max of 61000 (ASTM D4684) at -35C. 10wX is defined by low temp cranking viscosity (ASTM D5293) max of 7000 at -25C and low temp pumping viscosity max of 62000 (ASTM D4684) at -30C. You'll note there are minor differences between these including both the viscosity and temps at which they apply, but in both cases they are far below the temps most engines will see.

Most oil companies report viscosity at 40C (~100F), 100C (212F) and 150C (~300F), but I couldn't find any specs on Rotella on Shell's website. So for discussion purposes, I'll use the values from AMSOIL's Premium CJ-4 Synthetic Diesel 5w40. This diesel 5w40 has a viscosity of 90.8 at 40C (~100F). For comparison, the AMSOIL Z-ROD 10w30 I listed above has a viscosity of 74.2 at the same temp. So for most cars, during oil warmup, a 10w30 will flow better than a 5w40. That will not be the case for those stored outside in the winter in temps well below zero.

Personally, don't see the benefit of using a diesel oil in an automotive application as diesel oil's have lots of anti-soot additives that aren't needed and don't benefit a gasoline engine.

Corvette0096

http://www.sonnysracingengines.com/

One of the biggest name in racing engine says to use the stuff. Good enough for me.

MVP'S ZO6

I just run mobil 1 and I change the oil often.