5w 30 or 0w 40 for a W212




Every oil companies swears their oil are the best with tons of compliance certicates.
The issue with engine oil is the viscosity is usually very short lived. Oil turns liquidy black...

A 5W30 is substandard everywhere except Alaska. Buy a 5W40 if you're in Canada.
Our engines rely on oil viscosity to work the VVT and tensioners.
✌️
I did ask him what his recommended oil for my M273 engine was. And I can tell you no one here will want to know. I don't need the hate!
Last edited by BlackML550; Feb 6, 2024 at 06:32 AM.




confusing viscosity chart side by side
(My parents met when they were both working at SHELL Oil Co in the '60's.... my dad was always trying on new oils in his own engine.) - So viscosity performance was a familiar topic.
We can agree that we all have a similar viscosity target and understand viscosity is related to temperature, right?
Everyone is pegged on his favorite oil being the best and the cheapest where they know... AMZ👏
Every oil we pick is the best for us
The way piston rings are leaking a thicker oil is going to provide a thicker film. That's what it's all about: surfaces gliding on a film without rubbing.
Thin 0W-15 oils are amazing for ppl who need to be amazed. I can bet my hydraulics will like better 15W-40 honey.
Every engine runs at different temperature according to locale, mileage, blow-by, carbonized Lambda, driving style, ...oil pump pressure, internal unsealed leaks as discovered by @S-Prihadi front timing cover.
> MASTER PLAN:
Imagine a burnt black 0W-30 oil run under low pressure on dry heated pistons at extended intervals... dry pan: "Game Over".

Now, is 0W any quicker to flow than 5W or 10W at 32°F (0°C)? Probably not. So, I'll give 5W-40 a try on my next oil change (~6 mos from now). Then I'll be able to come back and praise the improvements of moving away from 0W.
Last edited by JettaRed; Feb 6, 2024 at 08:12 AM.




Now, is 0W any quicker to flow than 5W or 10W at 32°F (0°C)? Probably not. So, I'll give 5W-40 a try on my next oil change (~6 mos from now). Then I'll be able to come back and praise the improvements of moving away from 0W.




Mine had that nasty smell since new, and since I changed to Motul @85K miles, never again. Now @96K.
The Best of Mercedes & AMG




Mine had that nasty smell since new, and since I change to Motul @85K miles, never again. Now @96K.
Somehow no Mobil 1 users do oil testing and can't get current results.
I used M1 over 10 years ago and it was generating high iron on diesel engines. M1 had a chat room at the time, where their representative dodged the answer. Then M1 was removed form MB approval list, at least for diesels.
Now suppose their new formula is better, but no oil test and I am not going back to the brand, having other, easier choices.
Mine had that nasty smell since new, and since I changed to Motul @85K miles, never again. Now @96K.
Be well, all.

Edward





By now we have a pretty good idea what's best to lubricate our engines. Everyone has his own formula to pick what may work best for his driving habits.
We all seem to agree that 5kMi is about what our favorite oils can do well.
Here is something no one said:
ADAPTATION AFTER OIL UPGRADE!
Recently I moved to a better oil, my VVT was responding to the improved viscosity. The ECU had to readapt its positioning map from lower RPM.
This is what I wanted, live test showed me what direction to go. Next time I know what to bump up for less internal leaks and better working pressure.
> LEAK, VISCOSITY, RATTLING:
The legendary RATTLING LOCK actually takes place while engine is running with poor pressure at reduced RPM.
To prevent that I want early RPM activation from oil effective viscosity.
In addition consider the hydraulic chain tensioners. Old leaky tensioners shafts benefit from improved oil grade.
Low oil grade combined with low oil pressure is not what I want to waste ressources on.

Last edited by CaliBenzDriver; Feb 6, 2024 at 05:40 PM.




Be well, all.

Edward
I don't remember offering any credentials, nor will I offer you any advice or expertise in the future, your response indicates your utter arrogance and pompous know-nothing attitude, good luck! These 212's have numerous leak points, if you had any knowledge, you'd know that, but clearly your hubris precludes your ability to learn from others, revel in your ignorance.
Last edited by pierrejoliat; Feb 7, 2024 at 08:48 AM.
Fwiw, I need not any acknowledgement of anyone reading this, only just to say here I have written badly, and thus behaved badly, and with this have caused you consternation. And as such, I genuinely apologize for my words and ill behavior. Be well to you, sir, and to the forumites I will do better.

Edward
Liqui Moly (not molygen because of this thread https://mbworld.org/forums/c63-amg-w...ml#post8747556)
That said, I hear very positive results from forum members on using molygen despite not being recommended by the manufacturer, so there is that.
amsoil
motul
shell
castrol
Valvoline
(throwing mobil1 back in again for fun)
Please add in the ones I missed.
Would appreciate mentioning what oil specfically for example Liqui Moly Leichtlauf High Tech?
If you live in snow country, 0W is thinner to crank the car and flow easier
5W is fine for other zones and you can use 5W-30 also MB 229.5 if you are not going to thrash the crap out of the car
Good description on viscosities at:
https://www.castrol.com/en_au/austra...viscosity.html
Castrol EDGE v Mobil 1:
https://www.electronicshub.org/castr...llent%20choice.
Last edited by Bruce Hubbard; May 19, 2024 at 10:33 PM.
If you live in snow country, 0W is thinner to crank the car and flow easier
5W is fine for other zones and you can use 5W-30 also MB 229.5 if you are not going to thrash the crap out of the car
Good description on viscosities at:
https://www.castrol.com/en_au/austra...viscosity.html
Castrol EDGE v Mobil 1:
https://www.electronicshub.org/castr...llent%20choice.
https://cimg1.ibsrv.net/gimg/www.mbw...e203d9edd8.jpg
https://cimg0.ibsrv.net/gimg/www.mbw...70b623c52a.png
Last edited by DeanMassy; May 23, 2024 at 02:34 PM.
If you live in snow country, 0W is thinner to crank the car and flow easier
5W is fine for other zones and you can use 5W-30 also MB 229.5 if you are not going to thrash the crap out of the car
Good description on viscosities at:
https://www.castrol.com/en_au/austra...viscosity.html
Castrol EDGE v Mobil 1:
https://www.electronicshub.org/castr...llent%20choice.




5kMi is a good target number given oil viscosity still in range to power the hydraulic VVT gears.

Last edited by CaliBenzDriver; Jul 27, 2025 at 02:31 PM.




