I am a firm believer in pretty much any AMSOIL oil product and I use their fluids in my 97 vette (engine, trans, and diff)...however, that being said, I dont believe AMSOIL has the GM certification on the oil.
Does the oil meet the certification, yes, but has it been tested to the certification, no...

And because my Solstice is under GM warranty for the next 5 years, if anything happens to the engine while I'm using AMSOIL, they are going to throw a hissy fit. I'm just going to stick with Mobil 1 Syn.

Over on corvetteforum, the guys there are convinced that Mobil 1 synthetic forumla has been changed recently (within the last year or so) and that it isnt as good as it used to be...however, it still carries the GM cert...

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2008 Base 2.4L Manual
Sly Exterior, Black Top, Two Tone Interior
Preferred, Premium, Convenience Packages
Monsoon, Floor Mats, A/C
GXP Dual Exhaust/Fascia

Future:
Sport Metallic Pedals, Spoiler

I've been using Royal Purple for about 20,000 miles. I change oil and filter every 5,000 miles or so. The car runs 3º to 5º cooler since I switched.

Mobil 1 synthetic 5W-30. Walmart 5 qrt container for $24
K&N Filter
Do it me self.

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Deep, stick, ebony leather, prem. package, power package, convenience package, floor mats, AC, 6CD, monsoon system, XM radio, LSD, ABS, Chrome Wheels,

MODS- Solo SQR-2 Catback, Norm's Fascia, CAI by GM, Dashhawk, WR. by Kappasphere, Wheel Locks, 6" stubbie antenna, chrome stem caps, VentureShield Clear Bra, Chrommies, Painted/Decaled Calipers, Debadge, Sol. License Plate Frame,

Ahh good, then I wasn't imagining it. They do claim cooler running engine and a few other things as well

Why Use Royal Purple

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2008 Mysterious GXP (MoMo)
Solo Mach "Shorty" and Solo High Flow Cat
ADR wheels, XenTec headlights/fogs.
Badges removed, tinted windows.
Pontiac symbol overlays all around.
VIN 100541 - Drove it home 7/13/07. As of today; 26,000 Miles

I use KY with Aloe Vera for all my loobricant applications.
Water soluable too, so jus park over a ditch and pull the plug.
Wash out the filter with some Tide Super detergent and ready to go again.

1.25 inches = 32 mm

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Transformer SLY

FOUNDING MEMBER NASSOA

2008 GXP -Solstice go BOOM BOOM! Mazda jus go zoom zoom

"It's a Family Affair" Sly & the Family Stone


"Okolemaluna"

Now thats funny right there!

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Team Solstice 2008

Ordered 11/12/05
Black, manual trans, Premium package, power package, convenience package, floor mats, AC, XM radio, LSD, and Polished Wheels Produced 6/1! VIN:18718

Mods: Fujita CAI, Stubbie Attenna, Lil Chromies, Third Brake Overlay, 35% Tint. Solo Headers, Solo Exhaust.

Farm and Fleet in Wisconsin periodically offers Mobil 1 on sale. Have had OK experience bringing it to lub shop. Rallyracer

Next purchase time , ditch the KY and try Astroglide. WOW ! ;-p

I have always used Mobil 1 in all other cars, but local partsource had a good deal on Royal Purple so I decided to give it a shot, considering this is the second oil change.

I noticed that car seems more responsive to putting the pedal down.

Sounds like Royal Purple is getting some grand compliments!

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2008 Mysterious GXP (MoMo)
Solo Mach "Shorty" and Solo High Flow Cat
ADR wheels, XenTec headlights/fogs.
Badges removed, tinted windows.
Pontiac symbol overlays all around.
VIN 100541 - Drove it home 7/13/07. As of today; 26,000 Miles

W O W .... WAY TMI

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2007 Aggressive GXP (Manual) loaded minus On* and Smoker's Pkg (Born 11/10/2006 and picked up on 11/22/2006)

Current sMiles: 18,777

Click Here To See My Mod Page

TEAM RED BULL & VODKA 2008

Pennzoil Platinum and a Napa Gold filter.

Let me ruin that. Royal purple broke down a lot quicker on my last oil change than Mobil one. Mobil one still looks new after 3,000 miles when I change it. The Royal Purple was so bad at 2,500 miles I decided to do it early.

Mobil one FTW

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2004 Dodge Ram SRT-10 - 500HP/525 ft/lbs!!

Just got mine changed today with Mobile 1.

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2007 Deep GXP - M5, Loaded w/o OnStar
Mods: JPM Custom Shifter - Stubby Ant - WindRestrictor - Dejon TB Elbow - Dejon BOV Spring - JPM Center Console - JPM Visor Covers - Wester's Tune
Future Mods: delayed due to European Vacation!!

NASSOA Founding Member

Good to know, I will check it. I've got about 1800 miles to go until I reach 2500 miles since oil change.

Thanks for the heads up.

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2008 Mysterious GXP (MoMo)
Solo Mach "Shorty" and Solo High Flow Cat
ADR wheels, XenTec headlights/fogs.
Badges removed, tinted windows.
Pontiac symbol overlays all around.
VIN 100541 - Drove it home 7/13/07. As of today; 26,000 Miles