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Old 09-30-2015, 01:38 PM   #1
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10w40 mobile one safe?

Hey guys, so im running 5w20 full syn and noticed I'm starting to burn it. Think going over to 10w40 mobile 1 can help fix this?
Never had an issue while using motorcraft oil but I like how the smooth my car feels on full synthetic.
Also is 10w40 safe to run in the 2V?

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Old 09-30-2015, 02:13 PM   #2
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I ran the high mileage synthetic blend 10w40 in my 2000 GT it had 160k and still ran strong when I trader her in!
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Old 09-30-2015, 02:16 PM   #3
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That's what I'm thinking of doing, but full synthetic high mileage.

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---------- Post added at 07:16 PM ---------- Previous post was at 07:15 PM ----------

I'm at 149k haven't had issues just trying out full synthetic oils.

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Old 09-30-2015, 02:32 PM   #4
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That's what I'm thinking of doing, but full synthetic high mileage.

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---------- Post added at 07:16 PM ---------- Previous post was at 07:15 PM ----------

I'm at 149k haven't had issues just trying out full synthetic oils.

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You will probably burn just as much 10w-40 as you will 5w-20 unless you switch brands.

What brand of 5w-20 are you running? There is a little more to the story of oil consumption than just the oil's weight.


10w-30 is going to bring you the least amount of oil consumption, unless your rings are just absolutely shot in the butt and you have terrible leakdown. That is because the base oil used in 10w-30 allows them to use an additive package that offers less volatility. So when you buy 10w-30, you're not going to be topping it off or adding as much.

Amsoil 10w-30 will have lower oil consumption than any other 10w-30. Amsoil 10w30 is also better at protecting the engine from frictional wear. Mobil 1 is in a firm second place compared to Amsoil's stuff. I have empirically confirmed this in my lab with some elaborate testing and oil sample analysis.


To my dismay, Motorcraft is some pretty ****ty oil.

(these test results are not mine, but they are essentially the same as mine)
AMSOIL vs Mobil 1 Test Results
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Old 09-30-2015, 02:35 PM   #5
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Thank you for the information, I'm using Castro gtx magnetic. I never used to burn oil with motor craft or any other synblend

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---------- Post added at 07:35 PM ---------- Previous post was at 07:35 PM ----------

I'll try mobile 1 10w30 next oil change

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Old 09-30-2015, 02:44 PM   #6
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Thank you for the information, I'm using Castro gtx magnetic. I never used to burn oil with motor craft or any other synblend

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---------- Post added at 07:35 PM ---------- Previous post was at 07:35 PM ----------

I'll try mobile 1 10w30 next oil change

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That explains it. The Castrol GTX 5w-20 has volatility rating of 14%, that is almost triple the volatility of Amsoil 10w-30 (5.3 ish %). Mobil 1's 10w-30 volatility is almost 9%. That's significantly worse than Amsoil. You will have a lot more oil consumption with Mobil 1 than you will with Amsoil.

Your oil is literally vaporizing and then getting burned. Its probably gaining viscosity extremely quickly as well.

Amsoil stays within viscosity index for a ridiculous amount of time.


Mobil 1 is pretty good oil as well. But will not cut down oil consumption even close to as well as the Amsoil does. You gotta trust me on this. I have identical engines running both oils.
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Old 09-30-2015, 03:00 PM   #7
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I'll try amsoil out

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Old 09-30-2015, 03:32 PM   #8
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Good, that will bring you the best results. Your engine will wear less and burn less oil.


Amsoil is actually going to be coming out with some even better oil, I'm sure.
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Old 09-30-2015, 03:42 PM   #9
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Just use Mobil 1 extended performance and done.

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Old 10-01-2015, 07:45 AM   #10
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Just use Mobil 1 extended performance and done.

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Why? He is trying to burn less oil.. Mobil 1 is mediocre as far as that goes. Mediocre volatility = will burn just as much as other oils
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Old 10-01-2015, 09:00 AM   #11
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panther, where do you work?
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Old 10-01-2015, 09:10 AM   #12
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panther, where do you work?
Don't really want to post the name of my employer lol. But its an engine manufacturer-- And you've heard of them
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Old 10-01-2015, 09:19 AM   #13
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Don't really want to post the name of my employer lol. But its an engine manufacturer-- And you've heard of them
engine manufacturer is what i was lookin for. must be fun. lol
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Old 10-01-2015, 10:12 AM   #14
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engine manufacturer is what i was lookin for. must be fun. lol
Yeah it is really interesting. I'm learning a lot every day
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Old 10-01-2015, 03:36 PM   #15
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I say run 5W-30 Mobil1. 5W for clearance issues internally.
But, Get yourself an oil seperator/filter in line with your PCV intake. Get a new PCV valve. Get one today. All that oil you are consuming will be caught in the separator. Both are needed and justified & will help eliminate second guessing as to where the oil is going. Seal leaks, ect..
STEEDA works great and is cheap.
UPR & JLT have better ones, more expensive but worth it.
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Old 10-01-2015, 04:21 PM   #16
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Why? He is trying to burn less oil.. Mobil 1 is mediocre as far as that goes. Mediocre volatility = will burn just as much as other oils
Mobil 1 and Mobil 1 extended performance are two different oils. Mobil 1 Extended Performance is a true Base IV synthetic oil just like Amsoil. You mention the volatility rating of Mobil 1 compared to Amsoil. I'm not talking about Mobil 1. I'm talking about the extended performance oil of Mobil 1. A different line. If you are referring to Mobil 1 EP then you never wrote EP and just referred to it as Mobil 1. They are two different oils.

Mobil 1 EP is on the level of Redline, Royal Purple and Amsoil. Amsoil is fantastic oil no doubt. A bit pricey in my opinion compared to other similar base IV synthetic oils but a great oil at that.

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Old 10-02-2015, 07:39 AM   #17
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Mobil 1 and Mobil 1 extended performance are two different oils. Mobil 1 Extended Performance is a true Base IV synthetic oil just like Amsoil. You mention the volatility rating of Mobil 1 compared to Amsoil. I'm not talking about Mobil 1. I'm talking about the extended performance oil of Mobil 1. A different line. If you are referring to Mobil 1 EP then you never wrote EP and just referred to it as Mobil 1. They are two different oils.

Mobil 1 EP is on the level of Redline, Royal Purple and Amsoil. Amsoil is fantastic oil no doubt. A bit pricey in my opinion compared to other similar base IV synthetic oils but a great oil at that.

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That's true, I should have focused on the actual EP M1 that you pointed out. It is one of the best oils, indeed.

Volatility:
7.5% = Mobile 1 EP synthetic 10w30
5.5% = Amsoil synthetic 10w30

So the volatility of Mobile 1 EP is 2 points more. That means the volatility is 36% higher than it is with Amsoil. He's going to see about 36% more oil burned with Mobile 1 than he would with Amsoil.
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Old 10-02-2015, 11:41 AM   #18
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Where does one actually get their hands on amsoil anyway? All I can find is online retailers and high shipping costs. How much should I spend on a 6 quart oil change with amsoil?

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Old 10-02-2015, 12:09 PM   #19
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Where does one actually get their hands on amsoil anyway? All I can find is online retailers and high shipping costs. How much should I spend on a 6 quart oil change with amsoil?

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You get it at small businesses. They do not like to do business with large publically traded corporations. Motorcycle dealerships, race shops, online, or other Amsoil dealers is where. I don't think the fact that Wal-Mart doesn't sell Amsoil is such a bad sign lol.


Its pretty much the only brand of oil that we used in motocross for anything. Street bikes as well.
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Old 10-02-2015, 12:48 PM   #20
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yea ive only heard good things about it. But with 150k miles, and only daily driving, i dont know if wanna invest in that yet. If i were to buy a new mustang, then i'd be a lot more inclined. or maybe if i put in a rebuilt/low mileage engine.
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Old 10-02-2015, 12:55 PM   #21
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That's true, I should have focused on the actual EP M1 that you pointed out. It is one of the best oils, indeed.

Volatility:
7.5% = Mobile 1 EP synthetic 10w30
5.5% = Amsoil synthetic 10w30

So the volatility of Mobile 1 EP is 2 points more. That means the volatility is 36% higher than it is with Amsoil. He's going to see about 36% more oil burned with Mobile 1 than he would with Amsoil.
This according to Amsoil report! Wouldn't have anything to do with Amsoil trying to sell their oil over competitors oils, would it??? CAI companies also claim results with particular power gains too. Hummmmmm!

Perhaps that Amsoil report is 100% accurate! No doubt Amsoil is great oil but the Mobil 1 EP oil going to burn 36% more than Amsoil, well not sure that's truly accurate but possible.

I find it hard to believe that a person daily driving or semi daily driving their pony and changing oil on a regular basis of 5, 7,500 or even 10k mile change intervals will burn 36% more Mobil 1 EP (full base IV synthetic oil) over say Amsoil.

I would switch to Amsoil myself but can't convince myself to pay its cost. Personally, I would recommend for the OP to try a Mobil 1 EP and see if he is still buring oil. If he is, then try Amsoil.






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Old 10-02-2015, 01:04 PM   #22
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for the price and being able to get it at walmart, i may actually switch to mobil1 ep (from motorcraft) since i dont really have an oil burning problem.
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Old 10-02-2015, 01:22 PM   #23
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for the price and being able to get it at walmart, i may actually switch to mobil1 ep (from motorcraft) since i dont really have an oil burning problem.
I buy my Mobil 1 EP at Wal Mart for $27 for a 5 quart bottle. Great deal for great oil.

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Old 10-02-2015, 02:48 PM   #24
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I might just switch back to a synblend since i don't push my car to hard. Just DD and ocasionally driving like a maniac. I'll try either amsoil or mobile 1 ep next oil change to come up with a verdict. I do oil changes at 5k

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Old 10-02-2015, 03:53 PM   #25
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I might just switch back to a synblend since i don't push my car to hard. Just DD and ocasionally driving like a maniac. I'll try either amsoil or mobile 1 ep next oil change to come up with a verdict. I do oil changes at 5k

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My guess is you won't notice any difference between Amsoil and Mobil 1 EP with 5k mile oil change intervals. Heck, your oil is still 50% good life left with just 5k oil changes and that's using a blend. 👍👍👍👍😜

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Old 10-02-2015, 04:01 PM   #26
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Why have you decided to change it every 5k miles?
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Old 10-02-2015, 04:05 PM   #27
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Why have you decided to change it every 5k miles?
I wonder that too. 5k oil change intervals for someone who just drives a car as a DD and the car is not track raced or autocross raced is way crazy. Such good oil throwing away. Especially for using a great synthetic oil like Amsoil.

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Old 10-02-2015, 05:13 PM   #28
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that's another thing i was debating. currently i do 4~5k on motorcraft with a motorcraft filter. I've stocked up on those filters, and was considering royal purple for a longer interval, and a filter change in the middle. doesnt have to be rp, maybe mobil1 ep. What kind of intervals are you guys running? keep in mind, mines a 2 valve.

Also, back to the original post, My dad has a 06 toyota tundra with a 4.7, i used mobil super 5w20, and it burned so much of it that i had to add 2 quarts between oil changes (5k). switched to castrol gtx 5w30 and no issues. but idk, maybe mobil super is crap to begin with?
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Old 10-02-2015, 09:15 PM   #29
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Well this is the first time I've used full synthetic. I'm at 149k and want to mainten the engine as much as possible

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