Last year I used Mobil 1 in both vehicles (GTO and Jeep) and now only the Jeep gets it. Mobil 1 just isn't as good as it used to be and they are falling in their quality. They do still come factory fill on the Corvettes but I don't think that is going to last much longer. Now I use Penzzoil Ultra (the new stuff) even though it's kind of hard to find and a little pricey (8 quarts for anything is a lot I suppose). I changed the oil at 6k miles with Ultra and it came out looking brand spankin new. This was after driving across the country, driving the car in 115* heat, track days ect.. i know some people don't like their old reputation but oil changes (like Mobil 1) and so do their rankings and qualities. I'd also rock Amsoil, but it's damn near impossible to find.

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Everything needs more Corsa. No exceptions.

Follow my journey of flight at
http://alwaysastudentpilot.blogspot.com/

It's normal for oil to get black, that means it's cleaning your engine. It it doesn't then it's not suspending the the dirt in the oil and it's being deposited in the oil pan. This sludge cannot be picked up by the filter so the oil must contain it until you change it. So the Penzoil Ultra might not be a good choice to use.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

I put mobile 1 full syn. in at 150,000ish and nothing wrong except it still pulling out old crap even after 4-5 changes

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Dthreap wrote:

Yeah make sure your O2 isn't behind lazy, you want nice up and down.

Planeboy18 wrote:

^^Pro tip for more than just O2 sensor signals

i use valvoline full synthetic. lasts about 6k miles, and seems to run very smoothly.

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'07 GP Base SD Headers - hv3 - open cone - HPTUNERS user

I switched from Moble to Valvoline and very happy with it's performance.Plus it's easier to find which is a plus..

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2007 Black on Black GP-Smoked Led tails,SPO spoiler and grills,tint,d+s rotors,autostart with alarm,Hai

I was using royal purple and switched back to mobil 1. I did not notice much differenct between the two. I will either stick with mobil 1 or go the amsoil route.

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1999 GT|SLP CAI|Borla Catback| Shift kit|18" Koblenz|GMPP Lowering|GMPP handling|Blk Headlights|ER Rcokers|HV3|HV TB http://www.fquick.com/The_Guz

Anyone use Castrol Edge?

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I use Napa full syn 5w30 with a Napa Gold filter 1040 made by wix in my 04 CompG.

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2004 Grand Prix Comp G

I use Castrol Edge full synthetic, been using it for years and you know the saying......if it ain't broke don't fix it.

Milestone

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just an fyi napa oil is valvoline, so if your paying extra for napa oil you could buy valvoline and save money. Thats what ive done ever since the guys at napa told me it was the exact same but in a different jug

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DIY intake-HV3-3" catless dp-180 tsat-DIY shift kit-murphy custom tune

I use Amsoil. If I don't feel like putting in an Amsoil order I use Pennzoil.

Sorry accidentally double posted.

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2008 Dark Slate Metallic Grand Prix SE
Mods: Engine Bay Dress Up, DR DoorlockKnobs, PWNTIAC plate, Aux Input, HIDs, Liz's tinted tails, 4th B.L., audio stuff, tint, Interior LEDs, HV3, 180* stat
Next to Install: GXP Spoiler, Special Edition Fascias, Exhaust, HUD

Thanks for the info...

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2004 Grand Prix Comp G

Its all bout that Mobil 1 full synthetic just changed the oil today 4.5 quarts of fresh mobil one Synthetic with a mobil one filter!

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All sho no go...

I have a 2000 Pontiac Grand Prix with approximately 140K miles on it and I'm considering using Mobile 1 Extended Performance Full Synthetic oil. I have never used synthetic in my life and I'm wondering if all the horrors of oil leaking everywhere is true (at least subjectively true).

Any thoughts are greatly appreciated!

I just switched to Castrol Edge Titanium over royal purple.

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If the seals are dry/worn and there's a lot of dirt sealing the gaps, synthetic oil will wash out the dirt which will cause the oil to leak. I recommend a high mileage synthetic oil since it has seal conditioner that will soften the seals after a while and should stop any leaks.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

When I switched my GP with 100+k on it to full synthetic, I ended up with a Head Gasket leak within the 1st oil change. Coincidence or not.. who knows?

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I switched with 110k on my motor. Car leaked oil before, car still leaks oil now. If it has gotten worse I think it's more of the blown seals failing even more than the synthetic oil making it leak.

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[url=http://www.xboxlc.com/profile/austin0150]

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whats a good oil to put in a grand prix with 234 k's ?

High mileage conventional or synthetic oil will work fine depending on how long you want to go between oil changes.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

Castrol EDGE. Period.

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i have high millage but i usally get GTX castrol in my nissan altima and grand prix

I've used Valvoline for years and years. Never had any problem. When I have a chance to pull the motor on the 73 and replace the gaskets (that plan is on hold though), I'll be able to switch to full synthetic. I can't take a chance of there still being a cork gasket in there. Synthetic will eat right through that stuff.

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

I switched to full synthetic at 150ish and there were no leaks of any kind

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Dthreap wrote:

Yeah make sure your O2 isn't behind lazy, you want nice up and down.

Planeboy18 wrote:

^^Pro tip for more than just O2 sensor signals

i purchased my gp with 23k miles and my first oil change i switched over to mobile 1 full synthetic and now today im switching to royal purple