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Old 03-24-2008, 10:32 PM   #1
johncbourg
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Default Best Syn. Oil for Supercharged Motors

What is the Best oil for high horsepower supercharged motors?

Thanks
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Old 03-24-2008, 10:39 PM   #2
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I'm running twins and switched to Royal Purple 20/50. My motor hated it, went back to Mobil 15/50, all is well in OZ now.
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Old 03-24-2008, 11:00 PM   #3
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Quote:
Originally Posted by jersey jay View Post
I'm running twins and switched to Royal Purple 20/50. My motor hated it, went back to Mobil 15/50, all is well in OZ now.
I read the Mobil 1 15/50 is for supercharged motors. Thanks

Where can I buy 15/50? Looked all over the net.

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Old 03-24-2008, 11:37 PM   #4
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Royal Purple 10w30. Dont need the 5w-30 unless you drive in subzero weather.

Even better is Royal Purple's racing oil. It did better than all oils tested, even Redling.
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Old 03-24-2008, 11:57 PM   #5
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Originally Posted by johncbourg View Post


I read the Mobil 1 15/50 is for supercharged motors. Thanks

Where can I buy 15/50? Looked all over the net.
Nappa sells it.
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Old 03-25-2008, 12:22 AM   #6
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I stay away from the Mobile One-it just doesn't seem the same since they reformulated it. Honestly I use what is cheapest or on sale in a 10w30 grade-as I change it out as soon as I see the colour turn from gold to dark. The FI cars with the breathers, rich tunes and meth tend to be hard on oils-changing the oil often is just cheap insurance!

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Old 03-25-2008, 12:46 AM   #7
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Have you Guys ever used or know of anyone who's used Amsoil?
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Old 03-25-2008, 12:47 AM   #8
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10W 30 here. Works like a charm
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Old 03-25-2008, 12:58 AM   #9
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10W 30 here. Works like a charm

What brand do you use Nouman?
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Old 03-25-2008, 04:04 AM   #10
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I run 15w50 mobil 1 in the vettes (both the NA 427 road racer and the forged 346 paxton car) i bought out the local straus auto when they had 5 qt jugs on clearance for 15 bucks. The girl looked at me like I was nuts when I walked up with about 15-20 jugs. She said, this is for private people not shops, I said honey I'm not a shop I'm worse I'm a racer...Her face when I started loading it all into the vette was priceless.

run 5w30 mobil 1 in the supercharged 07 suburban tow rig too. I've been told 5 or 10w30 on stock motors, and with all the built motors from ECS Ive been told dino on break-in and synthetic 15w50 after. The guys never seemed particular on what went in it.

Heck at teh track one time we swapped oil and I think it wound up being half mobil half amsoil.

but clean mixed oil was better than beat to hell cooked oil.

realistically walking into the store I'd go with anything name brand heavy weight and synthetic. any clean oil is better than what was in there.
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Old 03-25-2008, 10:47 AM   #11
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I've been using Royal Purple 5w-30 motor oil in the Z06 since I got it. I also send out samples to Blackstone labs on a pretty regular basis. Just changed the oil this past weekend to 5w30 RP full synthetic, sample should be going out this week.

some of you running 15-50 oils, its been so long that I forget what the different numbers mean it terms of viscosity when hot & cold. anyone care to refresh my memory?
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Old 03-25-2008, 11:51 AM   #12
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Been running RP 10/30W for 12k now and change atleast every 2k about the time it gets dirty and no issues
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Old 03-25-2008, 02:10 PM   #13
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Quote:
Originally Posted by leojnknsC5 View Post
Royal Purple 10w30. Dont need the 5w-30 unless you drive in subzero weather.

Even better is Royal Purple's racing oil. It did better than all oils tested, even Redling.
I've been using RP 10w30 for 2 years.
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Old 03-25-2008, 04:14 PM   #14
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Mobil 1 15/50 buy it at Walmart in 5qt jugs...
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Old 03-25-2008, 04:31 PM   #15
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Quote:
Originally Posted by chriswtx View Post
Mobil 1 15/50 buy it at Walmart in 5qt jugs...
Yep...best thing for the higher tolerances of blueprinted engines.
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Old 03-25-2008, 05:53 PM   #16
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How much more oil do you guys add with centris?
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Old 03-25-2008, 06:46 PM   #17
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Quote:
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How much more oil do you guys add with centris?
None, factory fill level for me...
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Old 03-25-2008, 10:04 PM   #18
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Quote:
Originally Posted by AlwaysInBoost View Post
I've been using Royal Purple 5w-30 motor oil in the Z06 since I got it. I also send out samples to Blackstone labs on a pretty regular basis. Just changed the oil this past weekend to 5w30 RP full synthetic, sample should be going out this week.

some of you running 15-50 oils, its been so long that I forget what the different numbers mean it terms of viscosity when hot & cold. anyone care to refresh my memory?
A 5w-30 oil starts like it is a 5 weight and the "w" stands for winter. When hot, it is a 30 weight oil. So a 15w-50 starts like a 15 and runs hot like a 50. GM recommends a 5w-30 in just about everything they sell because it is a universal oil and works well in motors with tight clearances. A 50 weight oil may not work well in a motor with tight clearances, rather it works well in a motor with "loose" bearing clearances. Loose bearing clearances make more power in a race engine. You wont necessarily get better protection with a thicker (50) oil if your motor is set up with tight clearances, and you may actually lose power with the thicker oil.
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Old 03-25-2008, 10:58 PM   #19
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The Mobil 1 15w50 has almost 50% more anti-wear additive than the 5W30.. 1200ppm vs 800ppm. All of the "recommended" weights have to meet new emission standards and have lower PPM of the Zinc Phosphate(anti wear additive) in them...
Quote:
The active ingredient that you are talking about is phosphorus which is added thru a component called ZDDP. For products that meet the new ILSAC GF-4 specification the phosphorus levels for the oil must be less than 800 ppm phosphorus. The ILSAC level for phosphorus has been reduced to protect the catalytic converter and other emission protection equipment. The engine manufacturers are confident that this level of phosphorus will protect both new and older engines. However, there are Mobil 1 products which have a higher level of phosphorus (phos) and can be used in engines in racing or high performance applications; see the attached table.
http://www.mobiloil.com/USA-English/...duct_Guide.pdf
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Old 03-26-2008, 12:15 AM   #20
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Quote:
Originally Posted by johncbourg View Post
What is the Best oil for high horsepower supercharged motors?

Thanks
In this application, I would run an oil that has a high HTHS rating and high levels of ZDDP anti-wear additives (and as mentioned above new API SM/ILSAC GF-4 30 grade oils are limited to 800 ppm). As most of the oils on the market having both high HTHS rating and high ZDDP are 40 or 50 grade oils, I'd also be very easy on the throttle until the oil is warmed up. My personal guide is to not get on the throttle in either of my cars (02 Z06 and 06 CTS-V neither of which is supercharged) until the oil is at least 150F.

I personally believe the High Temp High Shear rating of an oil is a good indicator of how the oil will perform in the engine, particularly for those running the car hard. The High Temperature/High Shear Test measures a lubricant’s viscosity under severe high temperature and shear conditions that are similar to severe service applications in an engine. The below HTHS ratings were pulled straight of the corporate websites of the various companies.

Amsoil Series 2000 20w50 (API SM) – 5.8
Amsoil Premium Protection 20w50 (API SL) – 5.0
Amsoil Marine Synthetic 10w40 (API SL) – 4.6
Mobil 1 EP 15w50 (API SM) – 4.6
Pennzoil Marine SAE 40 (API SJ) – 4.5
Mobil 1 15w50 (API SM) – 4.5
Amsoil Heavy Duty Diesel 15w40 (CI-4+) – 4.4
Amsoil Premium Protection 10w40 (API SL) – 4.3
Amsoil XL 10w40 (API SM) – 4.3
Pennzoil Truck/SUV 15w40 (CI-4+) – 4.3
Pennzoil Long Life Heavy Duty 15w40 (API SL) – 4.3
Amsoil Premium Diesel 5w40 (CJ-4) – 4.2
Mobil 1 High Mileage 10w40 (API SL) – 4.06

FYI, these AMSOIL products all have high levels of ZDDP (about 1265 ppm phosphorus and 1378 ppm zinc):
AMSOIL Series 2000 20w50
AMSOIL SAE Synthetic High Performance 20w50
AMSOIL SAE Synthetic Premium Protection 10w40 (I ran this oil in my stock LS6 02 Z06 the last few seasons I raced)
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Last edited by C66 Racing; 03-26-2008 at 12:18 AM.
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