which oil
Race Director
Joined: Feb 2008
Posts: 17,336
Likes: 8
From: Maker of Sharp Objects, AL - Roll Tide
St. Jude Donor '10-'11-'12-'13-'14-'15-'16-'17
St. Jude Knife Maker
I have Royal Purple in my rear end, trans and engine. Seems to be pretty good stuff. Kinda pricy and hard to find at your normal outlet stores and auto parts stores. I just bought 7 quarts of RP 5W30 and a mobil 1 filter the other day and it was around $80.
Drifting
Joined: Nov 2001
Posts: 1,658
Likes: 25
From: Rochester Minnesota
Here is the list of oils that have actually been proven to meet the GM4718 spec. http://www.gm.com/corporate/responsi...ngine_oils.pdf Any of these will be "good" oils.
Also, I understand that Valvoline now has an oil that has been approved since this list was posted.
As long as the bottle says, "Meets or Exceeds" the GM4718 spec you're good to go. If it only says, "Recommended"-------well, "Run Forest, run!"
Also, I understand that Valvoline now has an oil that has been approved since this list was posted.
As long as the bottle says, "Meets or Exceeds" the GM4718 spec you're good to go. If it only says, "Recommended"-------well, "Run Forest, run!"
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
*sigh* Do we have to rehash this again? Search is your friend on this topic; there have to be about 5 million threads all with a) the same advice and b) the same internet "experts" touting opinions as facts.
Bottom line:
1. Buy a good oil that meets the mfgr's spec.
2. Change oil and filter often.
3. Go drive your 'Vette!
Bottom line:
1. Buy a good oil that meets the mfgr's spec.
2. Change oil and filter often.
3. Go drive your 'Vette!
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
So before we go off on a tanget, a posting of a letter on the internet is hardly conclusive. If someone can find the full study, then let's have a look and see what's there.
Last edited by billla; Feb 23, 2009 at 05:22 PM.
Le Mans Master
Joined: Sep 2007
Posts: 7,604
Likes: 8
From: Belleville Il
Here is the list of oils that have actually been proven to meet the GM4718 spec. http://www.gm.com/corporate/responsi...ngine_oils.pdf Any of these will be "good" oils.
Also, I understand that Valvoline now has an oil that has been approved since this list was posted.
As long as the bottle says, "Meets or Exceeds" the GM4718 spec you're good to go. If it only says, "Recommended"-------well, "Run Forest, run!"
Also, I understand that Valvoline now has an oil that has been approved since this list was posted.
As long as the bottle says, "Meets or Exceeds" the GM4718 spec you're good to go. If it only says, "Recommended"-------well, "Run Forest, run!"
!!
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Drifting
Joined: Nov 2001
Posts: 1,658
Likes: 25
From: Rochester Minnesota
Burning Brakes
Joined: Jan 2007
Posts: 1,152
Likes: 3
From: Hawaii
This is one of the most hotly contested and most discussed questions on this forum - as long as the oil meets the GM4718M standard, it will be okay to use it.
Mobil 1 is the factory fill for the Corvette, true enough - that doesn't mean that it's best. Mobil Oil spent a fortune with GM to get them to use it as a factory fill. There are many high quality synthetics available - pick one, use 5W-30 per Chevrolet recommendations, and go with it.
Mobil 1 is the factory fill for the Corvette, true enough - that doesn't mean that it's best. Mobil Oil spent a fortune with GM to get them to use it as a factory fill. There are many high quality synthetics available - pick one, use 5W-30 per Chevrolet recommendations, and go with it.