Driven DI40 Oil question
Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
It's simple. Thicker oils have less cold start protection. Most of all engine wear occurs at cold start. Running a 5w50 oil on a stock internal engine, for daily driving, is foolish and you're just doing more harm than good. Even with a cam and bolt ons, follow GM's recommendations for oil weights/viscosity.
5w has good startup protection and you give up less of the reduction in viscosity over time as mobil1 esp/supercar 0w40. Those tend to shear below -40 grade quickly.
Here is an interesting comparison of start-up wear using some lab testing for a 5w vs a 20w.
Le Mans Master
Joined: Jun 2019
Posts: 5,400
Likes: 2,132
From: Loveland
Nope... W is like you said, it stands for winter. The 5W, isn't 5 weight. The 5 is a classification of how well the oil will flow down to 5 degrees. Like 0W, how well the oil will flow down to 0*. There is no such thing as 0 weight oil, or 0 viscosity oil. 50 IS a weight classification that has different viscosity for every temp from 0*C to 100*C. Straight 30 weight oil,,, 0*C viscosity is 1124, 100*C viscosity is 8.8. This is a huge difference, this is why there is multi viscosity oil. NO,, it isn't multi weight oil, it's multi viscosity oil.
GM says you "need to remove" the 50 weight oil. I'm sure you will do just fine with 50 weight oil in your car.
GM says you "need to remove" the 50 weight oil. I'm sure you will do just fine with 50 weight oil in your car.
Last edited by kodpkd; Dec 15, 2024 at 06:27 PM.
Le Mans Master
Joined: Jun 2019
Posts: 5,400
Likes: 2,132
From: Loveland
That hasn't trended to be true with any UOA's for the 5w50 I've seen. Where are you seeing that analysis? https://bobistheoilguy.com/forums/fo...is-gasoline.3/
5w has good startup protection and you give up less of the reduction in viscosity over time as mobil1 esp/supercar 0w40. Those tend to shear below -40 grade quickly.
Here is an interesting comparison of start-up wear using some lab testing for a 5w vs a 20w. https://www.youtube.com/watch?v=zLBgIve1YzY
5w has good startup protection and you give up less of the reduction in viscosity over time as mobil1 esp/supercar 0w40. Those tend to shear below -40 grade quickly.
Here is an interesting comparison of start-up wear using some lab testing for a 5w vs a 20w. https://www.youtube.com/watch?v=zLBgIve1YzY
The one constant in the testing is the engine. As mentioned, it's an old school engine with lots of tests on it and large tolerances. I would love to see this test on a new generation engine with tight tolerances.. The recommended oil for this engine is probably 50 weight oil.
Last edited by kodpkd; Dec 15, 2024 at 10:14 PM.
Le Mans Master
Joined: Jun 2019
Posts: 5,400
Likes: 2,132
From: Loveland
Temperature
The viscosity of a lubricant changes with temperature – in almost all cases, as the temperature increases, the viscosity decreases; and – conversely – as the temperature decreases, the viscosity increases. To select the proper lubricant for a given application, the viscosity of the fluid must be high enough that it provides an adequate lubricating film, but not so high that friction within the lubrication film is excessive. Therefore, when a piece of equipment must be started or operated at either temperature extreme – hot or cold – the proper viscosity must be considered.
The viscosity of a lubricant changes with temperature – in almost all cases, as the temperature increases, the viscosity decreases; and – conversely – as the temperature decreases, the viscosity increases. To select the proper lubricant for a given application, the viscosity of the fluid must be high enough that it provides an adequate lubricating film, but not so high that friction within the lubrication film is excessive. Therefore, when a piece of equipment must be started or operated at either temperature extreme – hot or cold – the proper viscosity must be considered.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,475
From: South Florida
That hasn't trended to be true with any UOA's for the 5w50 I've seen. Where are you seeing that analysis? https://bobistheoilguy.com/forums/fo...is-gasoline.3/
5w has good startup protection and you give up less of the reduction in viscosity over time as mobil1 esp/supercar 0w40. Those tend to shear below -40 grade quickly.
Here is an interesting comparison of start-up wear using some lab testing for a 5w vs a 20w. https://www.youtube.com/watch?v=zLBgIve1YzY
5w has good startup protection and you give up less of the reduction in viscosity over time as mobil1 esp/supercar 0w40. Those tend to shear below -40 grade quickly.
Here is an interesting comparison of start-up wear using some lab testing for a 5w vs a 20w. https://www.youtube.com/watch?v=zLBgIve1YzY
Burning Brakes
Joined: Sep 2000
Posts: 782
Likes: 301
From: Coral Springs Florida
Mobil 1 0W-40 Supercar oil - good price
Great funnel same threads as oil cap.
Funnel details
Did my Z06 Oil Change today, oil life at 19% with 2629 miles since last oil & filter. 9.7 qts. Mobil 1 Supercar 0W-40 at $7.84 a qt. Rockauto Parts. 10 qts. Oil cost $78.40, UPF64R Oil Filter $7.86 plus $11.91 shipping. FL Tax $6.03. Total parts $104.20 Labor Cost.....me is free! Love that funnel designed for GM cars, threads into oil fill port with its threads that match the oil cap which keeps funnel fixed and firm, no tipping. I use the 64R as it has more filtering capacity and its structure is more robust, The bypass pressure difference never comes into play as I change the oil at close to 20% Oil life remaing.
Last edited by mjdart; Dec 17, 2024 at 10:23 PM.
Le Mans Master
Joined: Jun 2019
Posts: 5,400
Likes: 2,132
From: Loveland
@mjdart.
I hate to break the news to you,,,,, but you are using the wrong filter. The UPF64R is 35 psi bypass, the C7 requires a PF64 22 psi bypass. The C7 has a variable pressure pump.
I hate to break the news to you,,,,, but you are using the wrong filter. The UPF64R is 35 psi bypass, the C7 requires a PF64 22 psi bypass. The C7 has a variable pressure pump.
Last edited by kodpkd; Dec 17, 2024 at 12:41 PM.
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Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
If the idea is to trust GM, they recommend both. Both carry the DexosR approval.
Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
The Wiki: https://en.wikipedia.org/wiki/Cold-cranking_simulator
W=Winter grade, measured in centipoise using a cold cranking simulator. It isn't measured with centistokes like the kinematic viscosity of oil (2nd number in the multigrade format).
I think you may be assuming I'm equating the kinematic viscosity with the low-temperature cranking test. They are two different measurements at very different temperatures using entirely different measurements.
DexosR certification is backwards compatible according to General Motors.
W=Winter grade, measured in centipoise using a cold cranking simulator. It isn't measured with centistokes like the kinematic viscosity of oil (2nd number in the multigrade format).
I think you may be assuming I'm equating the kinematic viscosity with the low-temperature cranking test. They are two different measurements at very different temperatures using entirely different measurements.
Originally Posted by kodpkd
Yes GM recommends both..... BUT not for the C7!
Le Mans Master
Joined: Jun 2019
Posts: 5,400
Likes: 2,132
From: Loveland
I have shown specifically where GM engineers and Chevrolet recommend 0W-40 oil for the C7, and the reason and specifically say NOT to use 50 weight oil for daily driving. You have shown a bunch of techno engineering bull shti that means nothing.
Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
GM says to run it on the track, but you insinuate that to mean it will damage it on the street? Interesting take.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,475
From: South Florida
5w50 oil for daily driving WILL 100% cause more engine wear over time in a daily driver Corvette vs 0w40. While 5w50 is superior at high load, the trade off is cold start wear protection isn't as good.
A youtube video where they put 24 miles on the oil and do all these unlikely tests, does not replicate real world wear over time of hundreds of thousands of miles like GM's testing. If you want to run 50 weight oil daily in your car, by all means, knock yourself out. It ain't my car so I don't care. But don't come on the forum and advocate for people to run 50 weight oil in a daily driver and ignore GM recommendations. It's completely foolish.
A youtube video where they put 24 miles on the oil and do all these unlikely tests, does not replicate real world wear over time of hundreds of thousands of miles like GM's testing. If you want to run 50 weight oil daily in your car, by all means, knock yourself out. It ain't my car so I don't care. But don't come on the forum and advocate for people to run 50 weight oil in a daily driver and ignore GM recommendations. It's completely foolish.
Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
Burning Brakes
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
5w50 oil for daily driving WILL 100% cause more engine wear over time in a daily driver Corvette vs 0w40. While 5w50 is superior at high load, the trade off is cold start wear protection isn't as good.
A youtube video where they put 24 miles on the oil and do all these unlikely tests, does not replicate real world wear over time of hundreds of thousands of miles like GM's testing. If you want to run 50 weight oil daily in your car, by all means, knock yourself out. It ain't my car so I don't care. But don't come on the forum and advocate for people to run 50 weight oil in a daily driver and ignore GM recommendations. It's completely foolish.
A youtube video where they put 24 miles on the oil and do all these unlikely tests, does not replicate real world wear over time of hundreds of thousands of miles like GM's testing. If you want to run 50 weight oil daily in your car, by all means, knock yourself out. It ain't my car so I don't care. But don't come on the forum and advocate for people to run 50 weight oil in a daily driver and ignore GM recommendations. It's completely foolish.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,475
From: South Florida
https://drivenracingoil.com/n-2-why-...0your%20engine.
https://blog.amsoil.com/use-racing-o...-daily-driver/
https://www.racecar-engineering.com/...nce-motor-oil/
Last edited by Internets_Ninja; Dec 18, 2024 at 04:01 PM.
