Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Oil Viscosity.....GM and my local Service Manager


Recommended Posts

 

 

 

 

Run 0w-20 and be done with it. Too many of you guys out there still want to run 20w-50 in their engines because they believe they need "thick" oil for protection

Yes that's what i am going to do.

 

Thanks for your reply

Link to post
Share on other sites
  • Replies 48
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Popular Posts

Lesson of the day? Run the 0w20.

Dexos is not a GM oil is is a standard they have set for oils to meet to be considered for use in GM vehicles and for licensing purposes. Your 5w-30 oil you want to use meets the Dexos standard, so

And you prove my point exactly. I think, I'm not sure though. This conversation has gone way over my head now. The Engineering department at my school must have been lacking the class where they ta

I read the owner's manual on my '14 and the way they wrote it, regarding oil visc, they recommened 0-20. They specifically DO NOT allow 10-30 + . So left the 5-30 in the gray. IMO, they did this b/c if a dealer happens to dump 5-30 in a newer truck, it won't "void the warranty" and the dealer/GM can show them the book which states it it's not addressed. Just my 2 cents. I run full Syn Dexos approved 0-20. Oil and engines have progressed dude. the new 5.3L has a very advanced oil pump and i WOULD ONLY RUN 0-20!!!!! I've owned hondas, Fords etc. 0-20 is not new. Honda and Ford have been running it for 15yrs man. Get over the 4 barrel camaro joe dirt 20w-50 oil mentaility and run what GM specs and move on in life.

Link to post
Share on other sites

It's true that GM specifies 5W30 for the 6.2L Corvette variants of the Gen-V engines.

 

According to Mobil's product data sheets there's quite a bit (a lot more than I expected to see) difference in viscosity between 0W-20 M1 Dexos and 5W-30 M1 Dexos:

 

Viscosity at 100C...... 0W-20 = 8.7 5W-30 = 11.0 cSt

Viscosity at 40C...... 0W-20 = 44.8 5W-30 = 61.7 cSt

 

Obviously, there's a lot of overlap in viscosity over normal engine operating temperatures, but there's no getting around the fact that temperature for temperature, the 0W-20 is a lot thinner.

 

I just had my truck's 5.3L engine oil changed at the dealer last week. Asked for Mobil1. Guess what they put in: 5W-30.

 

On edit: corrected the temperatures (100C and 40C)

Edited by Lawnmower2020
Link to post
Share on other sites

It gets worse than that when you look at the HTHS @ 150 measurements which is what you should be looking at if the concern is engine wear while towing in the summer. For my favored Redline oil:

 

0W20 2.9

5W30 3.7

0W40 4.0

15W50 5.8

 

Mobile 1

0W20 2.7

5W30 3.1

15W50 4.5

 

Here are a couple interesting notes on the subject from Redline: http://www.redlineoil.com/news_article.aspx?id=291

  • Like 1
Link to post
Share on other sites

Run 0w-20 and be done with it. Too many of you guys out there still want to run 20w-50 in their engines because they believe they need "thick" oil for protection

Reminds me of my dad. Refuses to even put 5W-20 in his F150 when the oil cap says so. "I like the protection of 10W30", and then runs 20W50 in the summer.

Link to post
Share on other sites

GM does know what they're talking about. http://www.chevrolet.com/content/dam/Chevrolet/northamerica/usa/nscwebsite/en/Home/Ownership/Manuals_and_Videos/02_pdf/Corvette_TrackPREP_v23.pdf

 

It's interesting how closed minded so many people are on this subject. Provide evidence from credible sources and they'll pretend it doesn't exist and keep repeating the same thing over and over.

Link to post
Share on other sites

I also change my oil every 2000 miles because the OLM is designed by GM to make my engine explode at exactly 100,001 miles.

Edited by Black03Yukon
Link to post
Share on other sites

And you prove my point exactly. I think, I'm not sure though. This conversation has gone way over my head now. The Engineering department at my school must have been lacking the class where they taught the merits of hyperbole in place of data or theory in technical arguements. I guess I'm just not qualified to understand what you're trying to say and how you are backing it up. I know how to read data and equations, but snide comments confound me. Second order snide comments are even worse! Maybe if I can find a text book for Differential Hyperboles I can brush up.

  • Like 2
Link to post
Share on other sites

Get over the 4 barrel camaro joe dirt 20w-50 oil mentaility and run what GM specs and move on in life.

I'm good with all the comments and discussion in this thread so far except the asinine one i quoted. You don't know me from Adam or what my technical background or experience is. Keep the personal shots out of this thread. If you have something meaningful to contribute please do so. Be respectful.

 

There's not a huge difference between 0-20w and 5-30w and that's why i was initially thinking about this matter. I'm going to run 0-20w for now due to the info in this thread so thanks for your help.

Link to post
Share on other sites

There's not a huge difference between 0-20w and 5-30w

 

Well.... At 100C the viscosity of the 5W-30 is 26% higher than the viscosity of 0W-20 for the same Mobil1 product line. Is 26% huge or not? I think it's certainly enough of a difference to have an effect on pumping and windage losses, but since we have no idea how large those are in the overall scheme of things, it may or may not be visible in actual use.

 

As long as GM is okay with the film strength in the thinner product, I'll prolly stick with their recommendations. On the other hand, If I were pulling a heavy trailer cross-country in mid-July, I might get wild and crazy with something a bit thicker at the higher oil temperatures you'd expect to encounter.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.




×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.