Engine oil
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Joined: Oct 2013
Posts: 74
Likes: 13
From: Venice, Fl.
Engine oil
The new corv. comes with 5W-30 Dexos. In the past they used Mobil One. What is the reason for that other than maybe it is better to
break the engine in with regular oil. I know that Dexos is a synthetic
blend. When getting a new car I usually change oil between 1200
and 1500 miles to get small particles of metal out of the oil occured during break in. I want to change to Mobil One extended 5W-30.
Is that advisable. Thanks for the info Dennis
break the engine in with regular oil. I know that Dexos is a synthetic
blend. When getting a new car I usually change oil between 1200
and 1500 miles to get small particles of metal out of the oil occured during break in. I want to change to Mobil One extended 5W-30.
Is that advisable. Thanks for the info Dennis
Melting Slicks
Joined: Nov 2013
Posts: 2,016
Likes: 73
From: Texas
That question interests me as well. I plan to do an early oil change on mine (ordered 11/26/13). Dealer service manager doesn’t believe in running the oil to the end of life on the oil monitor, he says he is a 6mo change guy at the max. May be conservative but I consider it cheap engine insurance. Don
Le Mans Master
Joined: Dec 2006
Posts: 5,139
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From: H-Town Texas
I haven't had much luck in finding out exactly what is special, or different about the GM Dexos certification. I would think that there must be some characteristic the oil must have. From what I have read, one of the things about a Dexos oil is reduced airation. I would almost be willing to bet that this plays an important role in the PCV system on the LT1 DI engine. The system is designed to seperate oil from combustion gasses that recirculate through the intake. By using an oil with less airation, I think it allows for less carbon build up on the intake valve stems.
The Mobile 1 full synthetic is Dexos certified, so it should be good to use. I just bought oil for my Cadillac, and can't recall if the extended had the certification. But with a new motor, the extended isn't really going to make a difference. Besides, for me, 5000 miles is the absolute max I would run with any oil. The oil life monitor means absolutely nothing to me.
The Mobile 1 full synthetic is Dexos certified, so it should be good to use. I just bought oil for my Cadillac, and can't recall if the extended had the certification. But with a new motor, the extended isn't really going to make a difference. Besides, for me, 5000 miles is the absolute max I would run with any oil. The oil life monitor means absolutely nothing to me.
Melting Slicks
Joined: Nov 2013
Posts: 2,016
Likes: 73
From: Texas
I have a Pontiac G8GT which has an 8.8qt oil capacity. At the 6mo mark it has no more than 3500 miles on it and oil life remaining is very high, don’t go past 7 mo. I simply cannot bring myself to run any oil to the 15,000 mile mark that Mobil says the Extended is good for.
Since Dexos isn’t fully synthetic, I still think Mobil 1 is a better choice. Still don’t know what the dealer installs for the 2yr Chevy oil change evolution. Don
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Not trying to be picky here, I’ve run Mobil 1 for over 30 yrs. The backside of the 5qt containers says that the extended is better for cold weather startup protection than the original Mobil 1.
I have a Pontiac G8GT which has an 8.8qt oil capacity. At the 6mo mark it has no more than 3500 miles on it and oil life remaining is very high, don’t go past 7 mo. I simply cannot bring myself to run any oil to the 15,000 mile mark that Mobil says the Extended is good for.
Since Dexos isn’t fully synthetic, I still think Mobil 1 is a better choice. Still don’t know what the dealer installs for the 2yr Chevy oil change evolution. Don
I have a Pontiac G8GT which has an 8.8qt oil capacity. At the 6mo mark it has no more than 3500 miles on it and oil life remaining is very high, don’t go past 7 mo. I simply cannot bring myself to run any oil to the 15,000 mile mark that Mobil says the Extended is good for.
Since Dexos isn’t fully synthetic, I still think Mobil 1 is a better choice. Still don’t know what the dealer installs for the 2yr Chevy oil change evolution. Don
I guess they say the AC/Delco version of the Dexos is a synthetic blend, as to what exactly that entials, I'm not sure. But "Dexos" is a certification, not a specific oil, brand or blend. It seems to merely ensure that the oil holds certain properties and characteristics neccessary for the engine. So, any oil that is Dexos certified can be used in the LT1.
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
extended life oil is for high mileage cars to help control age related leaks, follow what GM recommends I've been doing that for over 40 years without issues. You either believe GM or someone that knows someone who knows yet angother someone that uses something else. The only problems I've ever had with 9 Corvettes over 40 years and a mill and half miles was when someone gave me good afvise, right.
Le Mans Master
Joined: Dec 2006
Posts: 5,139
Likes: 482
From: H-Town Texas
Sure, there may be better oils out there. But I've used it for a couple of decades in all of my cars and have no issues. In fact, the only time I had an issue was the one time I tried another, supposedly 'better' brand. Although, I will state clearly that my issue was caused by a "money shift" and not the oil.
Melting Slicks
Joined: Nov 2013
Posts: 2,016
Likes: 73
From: Texas
Tried to get C6 Demon’s oil info, mailbox full.
While there may be better oils than Mobil 1, what are they and in whose opinion as separated from facts? Looked at Valvoline’s certifications and they weren’t as good as the Mobil 1 Ext. Pennzoil Platinum wasn’t any better if as good if I remember correctly. Don
While there may be better oils than Mobil 1, what are they and in whose opinion as separated from facts? Looked at Valvoline’s certifications and they weren’t as good as the Mobil 1 Ext. Pennzoil Platinum wasn’t any better if as good if I remember correctly. Don
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Le Mans Master
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From: AZ
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
Le Mans Master
Joined: Dec 2004
Posts: 5,759
Likes: 539
From: AZ
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
The C6 started out with Mobil1 from the factory and IIRC, late in the run GM shifted over to the Dexos spec.
Racer
Joined: Aug 2013
Posts: 380
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From: Russellville TN
St. Jude Donor '13-'14-'15
Dexos is a standard developed by GM. Dexos 1 is for gas powered vehicles and Dexos 2 is for diesel powered vehicles.
There are quite a few oils that are dexos certified and you can find them at http://centerforqa.com/index.php?opt...d=31&Itemid=74.
I called the service manager at my dealer and he said that all C7's are leaving the factory with Mobile 1 in the engine. He's been fairly straight with me so I have no reason to doubt him.
There are quite a few oils that are dexos certified and you can find them at http://centerforqa.com/index.php?opt...d=31&Itemid=74.
I called the service manager at my dealer and he said that all C7's are leaving the factory with Mobile 1 in the engine. He's been fairly straight with me so I have no reason to doubt him.
Advanced
Joined: Dec 2004
Posts: 63
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From: Saint James City FL.
Picked up 11 qts. of Mobil 1, 5W-30 full synthetic at Walmarts today that has the Dexos logo on the label. Must have been a newer shipment because the also have Mobil 1 without the logo right next to it. Same price for both.
Safety Car
Joined: Dec 2011
Posts: 4,704
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From: Redondo Beach CA
If it were me with the new car, I would not be considering what used to be, I would only use the owners manual when selecting oil.
Oil formulations change as understanding improves. Info on the net sometimes uses opinions formed from old information that was good when they made their personal oil decision.
The Dextros label, as you will find , is only an identifying label so the average clown can walk into the store and buy the correct oil among a selection of like products, and not screw up, over time, a high tech engine with an almost on target oil selection.
All the best with the new stuff.
Oil formulations change as understanding improves. Info on the net sometimes uses opinions formed from old information that was good when they made their personal oil decision.
The Dextros label, as you will find , is only an identifying label so the average clown can walk into the store and buy the correct oil among a selection of like products, and not screw up, over time, a high tech engine with an almost on target oil selection.
All the best with the new stuff.
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
I drained the full 10qts from my Z51 at 400 miles, and the oil was already disgusting...
Probably should mention that I work for an oil company, but we make additives, so I don't have any brand allegiance.
I sent an 8oz sample to Insight/Testoil today to see how bad (or not) it looked even after such a short period.
I don't trust blends, period. The legalities of stating a synthetic blend are so ambiguous you can actually get by with using pure mineral oil with a synthetic polymer and still get by with the "synth blend" label.
Anyway... I'll keep everybody posted when it comes back. Thought that might add to this conversation, though.
Probably should mention that I work for an oil company, but we make additives, so I don't have any brand allegiance.
I sent an 8oz sample to Insight/Testoil today to see how bad (or not) it looked even after such a short period.
I don't trust blends, period. The legalities of stating a synthetic blend are so ambiguous you can actually get by with using pure mineral oil with a synthetic polymer and still get by with the "synth blend" label.
Anyway... I'll keep everybody posted when it comes back. Thought that might add to this conversation, though.
Tech Contributor
Joined: Jan 2006
Posts: 4,761
Likes: 240
From: Saint Louis MO
St. Jude Donor '14-'15
Oh, and if anyone is wondering, I have 10 1-quart bottles of M1 Extended sitting here to put back in. Be careful with newer re-labels of products.
Castrol Edge (previously Syntec) and Mobil 1 are no longer meeting the top API/ACEA specs. The SPT Edge and M1 Extended, respectively, took over for the previous (what are now standard-grade) products which met the higher specifications in the past.
There are entire forums devoted to this (Bob, etc). Just a friendly reminder for those who are planning to keep their C7 long-term.
Castrol Edge (previously Syntec) and Mobil 1 are no longer meeting the top API/ACEA specs. The SPT Edge and M1 Extended, respectively, took over for the previous (what are now standard-grade) products which met the higher specifications in the past.
There are entire forums devoted to this (Bob, etc). Just a friendly reminder for those who are planning to keep their C7 long-term.
Team Owner
Joined: Mar 2005
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From: salem OR
