5w-30

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Jun 7, 2023 | 10:46 PM

Gunsmokez

Thread Starter

Instructor

Joined: Nov 2021

Posts: 111

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From: Canada

5w-30

Hey just had my oil change done at dealership. First thing I noticed when I got home. Work order says Mobil 1 5w-30 synthetic was used.

I look under hood and cap says sae 0w-40 to be used.

So umm am I in trouble ?

Jun 7, 2023 | 10:50 PM

stevettec7

Melting Slicks

Joined: Jan 2015

Posts: 2,104

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From: Fleming Island Florida

Quote:

Originally Posted by Gunsmokez

Not at all. 5w-30 was what the factory filled the C7’s with until 2019 (I believe that year is correct).0w-40 was formulated by Mobil to allow owners to use the same viscosity for track and street. Then in 2019, Mobil posted a bulletin stating 0w-40 was acceptable in all C7’s. What year is yours?

Jun 7, 2023 | 10:50 PM

DrivesWithTwoFeet

Melting Slicks

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Posts: 2,014

Likes: 1,590

From: Clermont, Florida

If you don't track it you will be fine per the manual.

Jun 7, 2023 | 10:58 PM

Gunsmokez

Thread Starter

Instructor

Joined: Nov 2021

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From: Canada

Quote:

Originally Posted by stevettec7

mines a 2019

Jun 7, 2023 | 11:23 PM

Mad*Max

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Joined: Apr 2007

Posts: 16,023

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From: Toronto, Canada

C7 of the Year - Unmodified Finalist 2021

Quote:

Originally Posted by Gunsmokez

they should have discussed with you, you should call to ask that they used "dexos 2"

Jun 7, 2023 | 11:25 PM

RonC7

Safety Car

Joined: Dec 2012

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From: St. Louis Metro East IL

From the 2019 Owner's Manual:

RTFM

Ron

Jun 7, 2023 | 11:28 PM

Mad*Max

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Joined: Apr 2007

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From: Toronto, Canada

C7 of the Year - Unmodified Finalist 2021

This is what I used last time:

Jun 8, 2023 | 12:14 AM

Gunsmokez

Thread Starter

Instructor

Joined: Nov 2021

Posts: 111

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From: Canada

Quote:

Originally Posted by RonC7

From the 2019 Owner's Manual:

RTFM

Ron

ya I should be fine. It says mobil 1 5w-30 synthetic. How ever the oils fill dip stick shows a bit too much oil. Slight over the second hash tag! Annoying

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Jun 8, 2023 | 12:43 AM

aklim

Team Owner

Joined: Jul 2004

Posts: 28,432

Likes: 3,285

From: Hartford WI

Quote:

Originally Posted by Gunsmokez

ya I should be fine. It says mobil 1 5w-30 synthetic. How ever the oils fill dip stick shows a bit too much oil. Slight over the second hash tag! Annoying

You did allow it a few minutes to drip down and all that before checking, right? If it is slight over, I wouldn't worry. If it is way too much over, worry.

Jun 8, 2023 | 02:20 AM

#10

Avanti

Race Director

Joined: Mar 2001

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From: Bonneville Salt Flats

5W-30 was recommended for years, as noted (apart from track use). So, if you use yours exclusively on the street, no concerns.

Jun 8, 2023 | 06:25 AM

#11

Jungtfl

Advanced

Joined: Apr 2023

Posts: 65

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From: Bradenton FL

I am assuming that Mobil 1 5W-30 Dexos 1 is sufficient over the more expensive ESP?

Jun 8, 2023 | 06:35 AM

#12

mdformula350

Drifting

Joined: Jun 2013

Posts: 1,428

Likes: 478

From: Maryland, USA

just put in fresh 5w-30 , my engine didnt blow up,

yet........

Jun 8, 2023 | 07:02 AM

#13

Tinkertech

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Joined: Feb 2018

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From: North Texas

Is European formula OK now? I see that is what the bottle says.

Jun 8, 2023 | 08:16 AM

#14

sjw91

Drifting

Joined: Aug 2005

Posts: 1,317

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From: Melbourne FL

Quote:

Originally Posted by Tinkertech

Is European formula OK now? I see that is what the bottle says.

Not all of them. It needs to be Dexos approved.

Last edited by sjw91; Jun 8, 2023 at 08:46 AM.

Jun 8, 2023 | 08:47 AM

#15

eboggs_jkvl

Moderator emeritus

Joined: Jun 2001

Posts: 18,599

Likes: 3,951

From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati

2015 C7 of the Year Finalist

Sigh...

WHen asking a tech question, tell us what you have, it really helps.

What kind of 2019 do you have? Dry sump or regular? One takes 9.5 quarts the other, 6.5 quarts. One requires a special procedure to read the level of the oil, the other, ram the stick in, pull it out and read it.

So, response?

Elmer

Jun 8, 2023 | 09:00 AM

#16

Maxpowers

Le Mans Master

Joined: Aug 2015

Posts: 6,884

Likes: 2,884

From: Toronto

According to GM dexos approved helps the cats. Not sure why it doesnt do that in Europe lol.

Jun 8, 2023 | 09:11 AM

#17

sjw91

Drifting

Joined: Aug 2005

Posts: 1,317

Likes: 817

From: Melbourne FL

Quote:

Originally Posted by Maxpowers

According to GM dexos approved helps the cats. Not sure why it doesnt do that in Europe lol.

Not really. Dexos applies to several things, including a lower sulfur content to prevent valve deposits. The "Emissions System Protection" designation only applies to diesel engines. The levels of zinc and phosphorus (the things that hurt cats) are nearly the same as the 5w-30. Porsche, Mercedes, BMW, etc all use the European Formula 0w-40, and they don't have issues with cat failures.

Last edited by sjw91; Jun 8, 2023 at 09:18 AM.

Jun 8, 2023 | 10:31 AM

#18

Maxpowers

Le Mans Master

Joined: Aug 2015

Posts: 6,884

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From: Toronto

^^^
Thanks for the correction.

Jun 8, 2023 | 11:20 AM

#19

AnotherNorskie

Burning Brakes

Joined: Nov 2022

Posts: 910

Likes: 430

From: MN

Quote:

Originally Posted by RonC7

From the 2019 Owner's Manual:

RTFM

Ron

This surpised me. I always thought Dexos2 was for diesels:

https://vehiclefreak.com/dexos-1-vs-...ich-is-better/

We should be using Dexos gen1, gen2, or gen3.

Jun 8, 2023 | 11:35 AM

#20

sjw91

Drifting

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Posts: 1,317

Likes: 817

From: Melbourne FL

Quote:

Originally Posted by AnotherNorskie

This surpised me. I always thought Dexos2 was for diesels:

https://vehiclefreak.com/dexos-1-vs-...ich-is-better/

We should be using Dexos gen1, gen2, or gen3.

Kinda gets into corporate politics. They needed a higher HTHS motor oil to be able to handle driving on street and track, but GM's Dexos 1 spec is formulated more for fuel economy. The only other spec they owned at the time was Dexos 2, which was primarily used for diesels, but it fit the requirements. Now they seem to have Dexos D for diesels and Dexos R for performance cars.

Side note: Mobil has a rebate going on right now, and ESP is actually included this year. https://mobilpromotions.us/rebate/

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