Anyone bump up their oil weight from 5w-30 to 10w-30 after about 5000 miles .

[Chuck2001]

As other probably stated don't do that. It will not achieve the goal you're mentioning.

You can go down on first number, not go up, especially if you live in cold climate.

Ask Gemini why you'll have better answer than us, and specify your truck model.

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[STX6G]

No way in hell you should do that. The engines and its components are designed for a specific weight oil.

Your living in Texas and are totally against this . WOW

 

[STX6G]

At least it isn’t 0w-16, like on my wife’s rav4 hybrid

5w-30 seems almost old school these days.

0w-16 is sewing machine oil I would be bumping that up too .

 

[STX6G]

Wouldn’t 5w-40 be a heavier/thicker oil?

10w-30 is the same viscosity as 5w-30 when up at operating temps

You might be correct the 5W-40. Looks like the better choice than the 10W-30 .
So I have found this . I do use Lucas synthetic oils in my motorcycles .

 

[stemplar]

First, use the proper spec oil all the time; it’s WSS-M2C961-A1 or WSS-M2C963-A1 I think for 0w30 (https://www.fordservicecontent.com/...nformation/2025_Ranger_P703_TRD_OM_ENG_V1.pdf). Can you even get the improper viscosity in the correct spec?

As has been mentioned the first number only matters in cold temps. As for the aforementioned theory that a 10w30 will be better than a 5w30, there’s some merit to that theory, but in reality no two oils are the same, so the question about which is more durable between two needs to be left to actual tests and spectroscopy analysis. I'd bet my engine that a premium 5w30 will be "better" than a cheap 10w30.

5-40 would would have a higher viscosity. Meaning thicker oil better suited for higher operating temperatures and higher ambient temperatures.

You can't make generalizations like this about oil. Sure, a higher second number means the oil is more viscous when hot, but that doesn't mean it's "better" for a given engine. For our Fords specifically, you probably can't find one of these oils with the wrong viscosity for our engines that meets the Ford specification, and it's the spec that is ultimately more important than whether you choose the 5w30 or the 0w30 that are the only appropriate viscosities for our engines.

 

[1996-to-2025]

For our Fords specifically, you probably can't find one of these oils with the wrong viscosity for our engines that meets the Ford specification, and it's the spec that is ultimately more important than whether you choose the 5w30 or the 0w30 that are the only appropriate viscosities for our engines.

Correct! There is a unique Ford specification for each type of oil (0w-20, 5w-20, 0w-30, 5w-30, and so on) used in their engines. The only application where they spec 5w-40 is the 2016-2019 3.2L Turbo Diesel Transit. As many have reiterated in this thread only 0w-30 and 5w-30 are specified for Rangers. If OP wants to use 5w-40 no one can stop him, but I think it's a terrible idea unless you are actually racing the truck.

 

[Grand Nat]

First, use the proper spec oil all the time; it’s WSS-M2C961-A1 or WSS-M2C963-A1 I think for 0w30 (https://www.fordservicecontent.com/...nformation/2025_Ranger_P703_TRD_OM_ENG_V1.pdf). Can you even get the improper viscosity in the correct spec?

As has been mentioned the first number only matters in cold temps. As for the aforementioned theory that a 10w30 will be better than a 5w30, there’s some merit to that theory, but in reality no two oils are the same, so the question about which is more durable between two needs to be left to actual tests and spectroscopy analysis. I'd bet my engine that a premium 5w30 will be "better" than a cheap 10w30.

You can't make generalizations like this about oil. Sure, a higher second number means the oil is more viscous when hot, but that doesn't mean it's "better" for a given engine. For our Fords specifically, you probably can't find one of these oils with the wrong viscosity for our engines that meets the Ford specification, and it's the spec that is ultimately more important than whether you choose the 5w30 or the 0w30 that are the only appropriate viscosities for our engines.

That's why I recommended Ford Motorcraft 5W-30 Synthetic blend API SQ suited for Turbo charge Direct and Duel injection engines to that individual. I only said that a 10-30 could be beneficial if he's going to use his vehicle for extended rough service. As an auto tech for 33 year for the City of NY I never seen an engine failure due to a slight viscosity change unless your using olive oil or straight 30W in 20° weather. There really isn't a bad motor oil on the market today. Fords motor oil is produced by Phillips 66 to there specifications I don't know what manufacturer does the blending . Sopus that's Shell oil products does the blending for in Pennzoil, Quaker state and a few others. Warren industries blend for Walmart super tech oil. All meet most manufacturers specifications.

 

[stemplar]

That's why I recommended Ford Motorcraft 5W-30 Synthetic blend API SQ suited for Turbo charge Direct and Duel injection engines to that individual. I only said that a 10-30 could be beneficial if he's going to use his vehicle for extended rough service. As an auto tech for 33 year for the City of NY I never seen an engine failure due to a slight viscosity change unless your using olive oil or straight 30W in 20° weather. There really isn't a bad motor oil on the market today. Fords motor oil is produced by Phillips 66 to there specifications I don't know what manufacturer does the blending . Sopus that's Shell oil products does the blending for in Pennzoil, Quaker state and a few others. Warren industries blend for Walmart super tech oil. All meet most manufacturers specifications.

The ford motor oil I’m sure is good advice, but the rest is not. You’re ignoring the spec, WSS-M2C961-A1, and focusing on viscosity. And even ignoring the spec as you did, you can’t make generalizations like you did about viscosity because it very much depends on the engine an its components. Take an engine that is designed for 0w20 or even thinner as has been mentioned in this thread and put in a heavy diesel oil “because all oil is good these days” and you’ll have terrible oil flow, possibly catastrophic. Always use the proper spec oil with a recommended viscosity that is appropriate for your ambient climate.

 

[av8r]

After reading a lot of things with all these manufacturers be forced to run lighter weight oils just for better fuel economy . I was thinking that after 5,000 miles a 10w-30 oil might actually be a better oil for engine longevity.
So are there any of you doing this yet , or am I going to be the first .

Another internet engineer voices their "opinion"

Bruh, stick to what you're good at. Leave engineering to the engineers.

 

[STX6G]

Another internet engineer voices their "opinion"

Bruh, stick to what you're good at. Leave engineering to the engineers.

Have you ever noticed that most all oils are sold in increments of 5 or 10W .
And since I’m just another one of those internet engineers at the age of 66 .
My mystery question for you is , what would a 5000 gal batch of oil that has a wt of 8w-38 be bottled as ?
Think about the fluctuations that are going to happen with the shipments of different base oils .
And yes you can be a loyal guy to OEM , but remember what I said, The government forces these lower viscosity oils on the manufacturers , so its’ok for our government to dictate their engineering Expertise until there’s issues at 75 or 100,000 miles and then what , the manufacturers all start back peddling and change their oil recommendations to a different viscosity .
And the answer to the question is 5W-30. And this is not my opinion .

 

[Aemonn]

Have you ever noticed that most all oils are sold in increments of 5 or 10W .
And since I’m just another one of those internet engineers at the age of 66 .
My mystery question for you is , what would a 5000 gal batch of oil that has a wt of 8w-38 be bottled as ?
Think about the fluctuations that are going to happen with the shipments of different base oils .
And yes you can be a loyal guy to OEM , but remember what I said, The government forces these lower viscosity oils on the manufacturers , so its’ok for our government to dictate their engineering Expertise until there’s issues at 75 or 100,000 miles and then what , the manufacturers all start back peddling and change their oil recommendations to a different viscosity .
And the answer to the question is 5W-30. And this is not my opinion .

The government doesn't dictate engineering. They specify fuel mileage (in this case) and emissions requirements. Agree or disagree with such requirements, the manufacturers then engineer to meet it.

Not sure how fuel mileage requirements become "the government dictates oil viscosity". I mean sure, without the fuel mileage requirements, things might be different but engineers determined the/a comprehensive solution based on required parameters. It's not just the oil viscosity.

 

[CoastieN70]

The difference between 5W-30 and 10W-30 is negligible as far as gas milage goes. On cold start up the oil is more viscus and your engine will work slightly, and I do mean slightly, harder, but unless you are in sub-arctic conditions it won't matter.
10W-40 would achieve your desired outcome but your gas milage will decrease slightly.
The most import component of modern oils is their wear additives, and these are what engine manufactures use for their specification recommendations.
So as long as the oil meets those specifications you should be good to go.

Mobile 1 10W-40 meets the Ford specs as does several others. Using 10W-40 oil will NOT harm your engine or void any warranties but it will cost you slightly in gas milage.

 

[1996-to-2025]

Mobile 1 10W-40 meets the Ford specs as does several others. Using 10W-40 oil will NOT harm your engine or void any warranties but it will cost you slightly in gas milage.

No, it does not.

https://www.mobil.com/en-us/passenger-vehicle-lube/pds/io-xx-mobil-1-high-mileage-oils

 

[superj]

i wonder if you check what the aussie and euro/asian trucks are being called to use, will it differ from ours?

that is where we would always see differences in other manufacturer info. the rest of the world generally got told to use what the oem actually thought the truck should use and america got told to use what got the gas mileage requirements and still let the truck last long enough to keep most people happy.

 

[purdyd]

What is the build date? If it sat on the lot for any length of time , that could of blown in the shielding, rust... It's gonna happen.

No, it does not.

https://www.mobil.com/en-us/passenger-vehicle-lube/pds/io-xx-mobil-1-high-mileage-oils

Correct and specifically doesn’t meet FORD WSS-M2C961-A1 which is the spec for the rangers

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