GM4718M vs. DEXOS1

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My wifes Caddy, a 2007 STS V-6 AWD's owners manual states that I need to use a 5w30 oil meeting GM4718M standards. I know that Oils which meet GM4718M tend to be made from synthetic base stocks, so it is often referred to as a "synthetic" specification.

My question is: Would/should the newer DEXOS spec oils meet the GM4718M standards? The reason I ask is because if it does I might be able to use some of that DEXOS approved Castrol synblend that I just ordered from autozone saving me a ton of money.

Thoughts?
 
I thought Dexos1 exceeded all previous GM requirements, except where Mobil 1 is required. I think you'll be fine with that Castrol SynBlend.
 
Wow that's great news. This will be a great savings for me since her cars OLM always seems to go off near the severe service end of the OLM range due to short tripping. Thanks for the quick help people.
 
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I'm not sure why they specified High Performance engine oil for your application (4718M is called the high performance oil specification while 6094M is the standard oil specification)

As you have noticed, only synthetic oils meet 4718M. It'll probably be fine to run the Dexos syn blend, but if it were my car, I would probably stick with the specified synthetic oil.

Edit: That is good news above about Dexos 1 being officially approved by GM for use in 4718M applications.
 
Originally Posted By: bigt61
I thought Dexos1 exceeded all previous GM requirements, except where Mobil 1 is required. I think you'll be fine with that Castrol SynBlend.


What gm engines "require" mobil 1?......
 
Originally Posted By: cven
Originally Posted By: bigt61
I thought Dexos1 exceeded all previous GM requirements, except where Mobil 1 is required. I think you'll be fine with that Castrol SynBlend.


What gm engines "require" mobil 1?......


None. Mobil1 probably just paid GM to put their logo on the oil cap. Think of it as product placement just like what you see on TV shows and the movies.
 
I have found the high mileage semi-syn oil works well in the 3.6L engine. I have used Valvoline maxlife mostly but Castrol's high mileage oil also has worked well.
 
Corvette Z51 and Z06 are factory filled with Mobil 1 from the factory and the owner's manual recommends the continued use of Mobil 1.

Camaro Z/28 is also factory filled with Mobil 1 as well.

Honestly, just get Mobil 1 cheap at Walmart and use that. It is Dexos 1 approved and meets GM4718M standards as well. Dexos 1 approved oils are required/recommended by GM for all 2011 GM vehicles and GM states that Dexos 1 approved oils are suitable for all GM vehicles 2010 and older as well. Use any Dexos 1 approved oil with confidence.
 
Good that you put in the "recommended" after the required to make it more accurate. My 2013 owners manual says "dexos1 or equivalent". I use an oil that is "equivalent" in that it is a reputable oil that claims dexos1 compliance, yet is not on the "official" dexos1 list. And it specifically lists meeting the 4718M as well.
 
Originally Posted By: GM4LIFE
Corvette Z51 and Z06 are factory filled with Mobil 1 from the factory and the owner's manual recommends the continued use of Mobil 1.

Camaro Z/28 is also factory filled with Mobil 1 as well.

Honestly, just get Mobil 1 cheap at Walmart and use that. It is Dexos 1 approved and meets GM4718M standards as well. Dexos 1 approved oils are required/recommended by GM for all 2011 GM vehicles and GM states that Dexos 1 approved oils are suitable for all GM vehicles 2010 and older as well. Use any Dexos 1 approved oil with confidence.


What. And you don't think Exxon either paid with product or cash for those labels.
Come on.
And Mercedes and BMW have oil brands on their caps too. You think they do that for free.
I'm amazed sometimes what I read here.
But not surprised.
 
My car has 0W-40 M1 on the cap and was filled with it from the factory.

In no way do I consider it anything but advertising.

Any major 40w will do, I am only looking for decent quality synthetic...
 
Originally Posted By: bubbatime
I'm not sure why they specified High Performance engine oil for your application (4718M is called the high performance oil specification while 6094M is the standard oil specification)

As you have noticed, only synthetic oils meet 4718M. It'll probably be fine to run the Dexos syn blend, but if it were my car, I would probably stick with the specified synthetic oil.

Edit: That is good news above about Dexos 1 being officially
approved by GM for use in 4718M applications.


I have seen this myself, but yet I find it odd. So is dexos 1 just as good, or better than 4718M, even thou that dexos 1 has passed for synthetic blend, but 4718M does not? Obviously, dexos 1 is a lot better than 6094M.
However, I have decided to see what the 2014 Chevy Corvette manual says, and they say dexos 1 synthetic blend is ok for normal driving. Mobil 1 is recommended, I think any oil that is dexos 1, 4718M approved would be ok in place of Mobil 1.
 
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I find it funny that my 2000 z-28 "Ls1" manual has no mention of syn oil or mobil 1...yet the vett can't get by without it?...lol
 
Originally Posted By: bubbatime
I'm not sure why they specified High Performance engine oil for your application (4718M is called the high performance oil specification while 6094M is the standard oil specification)

As you have noticed, only synthetic oils meet 4718M. It'll probably be fine to run the Dexos syn blend, but if it were my car, I would probably stick with the specified synthetic oil.

Edit: That is good news above about Dexos 1 being officially approved by GM for use in 4718M applications.


I am with you. 4718M is a spec that only a full synthetic can( could )meet. It was originally come up with as I recall reading for the Corvette due to heat issues( i.e. poor air flow and cooling ).

f I had a vehicle that was pre-dexos and it called for 4718M I would ONLY run a full synthetic dexos oil. I would not run a blend in that application.

JMHO FWIW!
 
Originally Posted By: cven
I find it funny that my 2000 z-28 "Ls1" manual has no mention of syn oil or mobil 1...yet the vett can't get by without it?...lol


4718M was originally developed for the Corvette( might have started with Z06? )because the design of the front end, and the tight fit of the engine, lead to poor air flow and cooling( as I recall reading ). A full synthetic that could handle the extra heat was used to resolve it. That wasn't an issue for your Z28.

Mobil pays( paid )for the privilege of having their name on the oil cap. Doesn't mean the vehicle HAS to have M1. That is something the average person might think but I doubt most here believe that.
 
was that the "it needs an oil cooler or different oil spec" so they went with the cheapest option thing? iirc
 
I think it was a space/weight issue instead of a bean counter decision.

Originally Posted By: cven
was that the "it needs an oil cooler or different oil spec" so they went with the cheapest option thing? iirc
 
Originally Posted By: NHHEMI
I am with you. 4718M is a spec that only a full synthetic can( could )meet.

Another point... dexos1 also replaces the old GM-LL-A-025 spec. GM-LL-A-025 was a high HT/HS spec (above 3.5 cP), if I remember correctly. Dexos1 is not.
 
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