What weight oil over and over

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And if it DOESN"T specify a weight, then what? :ROFLMAO:
JFTM!
 
I remember the old days working in my father's shop - Pennzoil SAE 30 and 10w-40. There were a few cans of non-detergent Pennzoil (black top) SAE 30.

There were two rectangular tanks with crank pumps; one filled with Type-A, then later with Dexron (most likely Dex-II/III) and the other with Type-F ATF.
 
Those engineers that designed don't know diddly squat, the people that wrote the manuals are just marketers, and we know best because we read the MSDS for a trillion brands and make W... A.. Guesses.
Engineers write manuals, "marketers" don't. The engineers know all about the relationship between oil viscosity, MOFT and wear. It's CAFE that forces them to "recommend" the thinnest oil possible without causing engine warranty claims.
 
Well Mr. Measureman,
It seems like a lot of people here seem to think they know better than the engineers that designed the cars. They will also use CAFE requirements to back up their claims and think that the auto manufacturers are out to get us all for better mpg figures. Lots of tin foil hat wearers :)
Car manufacturer's aren't effected by CAFE ? ... 😄🤫
 
And if it DOESN"T specify a weight, then what? :ROFLMAO:
JFTM!
BEVO list. Your only choices are 0/5W - 30/40. Many brands to choose from (well, not for 229.6 yet, but give it some time). Easy peasy. Pick your weights by temp, then pick something on the list that is available and strikes your fancy.
No need to get all wrapped up in what is best because MB doesn't. If it's on the BEVO MB approves.
Look, they put Fuchs in my car at the factory (verified by MB in their original BEVO) along with a sticker recommending Mobil, LOL. They developed the trans fluid with Shell, but don't recommend Shell, just meet the spec. It isn't that critical if MB puts it on the approved list.
 
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Engineers write manuals, "marketers" don't. The engineers know all about the relationship between oil viscosity, MOFT and wear. It's CAFE that forces them to "recommend" the thinnest oil possible without causing engine warranty claims.
Tongue in cheek Z. I go by the manual. ;)
 
How were they different? I am interested.
Me too! They were both Ravenol brands, FDS and VST, but the VST is very different with no apparent loss of fuel economy.
As kschachn says, they both specify a minimum HT/HS, but "feel" totally different.
Oh, and I have to say, I only posted the MB manual for the sake of this discussion, I already knew how I was going to choose an oil.
 
I see a lot of posts asking what weight oil should I use.
Isn't that stamped on just about every oil fill cap?
Or in the owners manual.
Of course there are exceptions like real old cars or odd ball cars but very few drive those
 
Are you satisfied with the answers you got?
1. No they are not always on the oil cap, not even in 2018.
2. No, they are not always specified in the owners manual.
 
If we have to use what’s either stamped on the oil cap or what’s written in the manual, I guess I have to start going to the Honda dealership and use only “Genuine Honda Motor Oil” or else I’ll ruin my motor?😐
 
Those engineers that designed don't know diddly squat, the people that wrote the manuals are just marketers, and we know best because we read the MSDS for a trillion brands and make W... A.. Guesses.
If the specified oil viscosity was actually from the people who designed & tested the motor you would have a very solid point. any amount of testing, research, or speculation I can do as a mechanic pales in comparison to what the manufacturer does in developing a new engine.

But for quite a while now the specifications we receive as consumers are not based solely on the needs of the engine but instead a compromise between engineers, accountants, attorneys & politicians. and this is why you see widely varying viscosity specified for the exact same engine based on the laws of the country it is being delivered to.

There is a current Mazda engine made in Japan and shipped worldwide, identical motors with no changes for various markets, In the USA 0w-20 Only. & Europe & Mexico 0w-20 or 5w-30, elsewhere a wide range of viscosity up to 10w-50 are specified based on ambient temperature.

Obviously this motor will run on 0w-20, but It would be inaccurate to say that that 0w-20 is ideal for all conditions from Barrow AK to Key west FL, and as long as you live outside the reach of certain laws Mazda will tell you the same.

https://owners-manual.mazda.com/gen/en/mx-5/mx-5_8gu7ee18e/contents/07030400.html
 
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1. This site is geared towards obsessive behavior.
2. Are you aware of drivetrain failures, recalls, etc? Obviously, the cliche "the engineers knew what they were doing" is not exactly true.
 
If we have to use what’s either stamped on the oil cap or what’s written in the manual, I guess I have to start going to the Honda dealership and use only “Genuine Honda Motor Oil” or else I’ll ruin my motor?😐
From memory don't some Kia's say to use Quaker State oil that is A5/B5, which doesn't exist.
 
From memory don't some Kia's say to use Quaker State oil that is A5/B5, which doesn't exist.
I’m thinking you’re correct. QS was listed as the oil to use in the owner’s manual. And all the Volkswagens and Audis I’ve seen have “Castrol” stamped on the oil fill cap.
 
If we have to use what’s either stamped on the oil cap or what’s written in the manual, I guess I have to start going to the Honda dealership and use only “Genuine Honda Motor Oil” or else I’ll ruin my motor?😐
Honda oil comes from Honda oil wells so yes use Honda oil. You tires will last longer.
 
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