synthetic oils
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New User
Joined: Jul 2007
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synthetic oils
is anyone running synthetic oils for motor,tranny,rears, ect. if so what do you suggest for brand and weight and as far as motor what change interval are you changing the oil. thanks for any info
Cargo Master
Joined: Aug 2005
Posts: 2,051
Likes: 1
From: Alberta, Canada
For the engine 5w40 syn is what will cover the broadest tempature range. People here use it for towing as well with no problems. Brand wise the the most popular are Rotella T syn and Mobil 1. I am up in Canada and Use PetroCan Duron Syn as it is easier to get. Be sure to use OEM type filters only, they are made by Racor.
Jäger
Joined: Jan 2005
Posts: 5,491
Likes: 5
From: Northern Arizona
Your profile shows 04 F250 and you're posting in the 6.0 forum so we'll assume that's what your question is about. You may want to go into 'User CP' and add your trucks specs so we can assist you better. 
Mercon SP is the only transmission fluid which can be used in the Torqshift trans in your truck. It's not yet licensed to be made by other companies so that's the only choice right now.
I use Mobil 1 75W-140 in the Sterling 10.5 rear axle and Mobil 1 75W-90 in the Dana 60 front axle. If your truck is 4wd then it has a Dana 50 front axle but would use the same weight axle lube.
I use Mobil 1 trans fluid in the NVG transfer case.
I'm currently running Rotella T syn as Super 08 mentioned in his post. I'll change it at 5,000 miles since I tow a heavy trailer the greater percentage of the time. Super 08 also gave excellent advice regarding only using Racor made/licesned oil filters. Do not use will fit as they don't fit! Racor, Motorcraft and Fram are good.
Check out FTE site sponsor Diesel Filters Online for good deals on 6.0 and Torqshift filters and Mercon SP trans fluid.
www.dieselfiltersonline.com/Ford-6-0-Liter-Turbo-Diesel-Truck-Filters.aspx
Mercon SP is the only transmission fluid which can be used in the Torqshift trans in your truck. It's not yet licensed to be made by other companies so that's the only choice right now.
I use Mobil 1 75W-140 in the Sterling 10.5 rear axle and Mobil 1 75W-90 in the Dana 60 front axle. If your truck is 4wd then it has a Dana 50 front axle but would use the same weight axle lube.
I use Mobil 1 trans fluid in the NVG transfer case.
I'm currently running Rotella T syn as Super 08 mentioned in his post. I'll change it at 5,000 miles since I tow a heavy trailer the greater percentage of the time. Super 08 also gave excellent advice regarding only using Racor made/licesned oil filters. Do not use will fit as they don't fit! Racor, Motorcraft and Fram are good.
Check out FTE site sponsor Diesel Filters Online for good deals on 6.0 and Torqshift filters and Mercon SP trans fluid.
www.dieselfiltersonline.com/Ford-6-0-Liter-Turbo-Diesel-Truck-Filters.aspx
Laughing Gas
Joined: Nov 2006
Posts: 909
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Originally Posted by Kepler4
Mercon SP is the only transmission fluid which can be used in the Torqshift trans in your truck. It's not yet licensed to be made by other companies so that's the only choice right now.
Also amsoil makes a severe duty 75w110 gear lube that is a bit thinner and should help with MPG.
Rest assure anything you get from amsoil is top notch....dont listen to there ad slogans but talk to the customers who have used it for 3-400 hundred thousand...But with that said I dont use there Motor oil nor do I/reccomend to others to run ANY!! oil longer than oem reccomendation's with out a OA.
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 11
From: Arizona
Originally Posted by WishIhada7.3
Actually amsoil has a tranny fluid that meets the Ford mercon sp standards/rating.....It is to my knowledge the only fluid other than ford's that can be used in the tranny.....
Unfortunately this is some more bad one size fits all marketing from Amsoil.
Also it cost alot more than the OEM Motorcraft Synthetic Mercon SP.
Postmaster
Joined: Apr 2004
Posts: 2,654
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From: Bossier City, LA
I will say this about the Amsoil tranny fluid, Why? As the Motorcraft SP is already a full synthitic, and has held up extremely well. Amsoil is more expensive, and if you read the fine print, you still have to change it at the recommended Ford service interval.
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Postmaster
Joined: Dec 2003
Posts: 4,196
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From: Arizona
Originally Posted by Kepler4
Mercon SP is the only transmission fluid which can be used in the Torqshift trans in your truck. It's not yet licensed to be made by other companies so that's the only choice right now.
Originally Posted by Kepler4
I use Mobil 1 75W-140 in the Sterling 10.5 rear axle and Mobil 1 75W-90 in the Dana 60 front axle. If your truck is 4wd then it has a Dana 50 front axle but would use the same weight axle lube.
Last edited by blackhat620; Jul 4, 2007 at 02:08 PM.
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Postmaster
Joined: Dec 2003
Posts: 4,196
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From: Arizona
Originally Posted by mullins2000
is anyone running synthetic oils for motor,tranny,rears, ect. if so what do you suggest for brand and weight and as far as motor what change interval are you changing the oil. thanks for any info
You can use any properly rated Synthetic fluid in the Front Axle, Transfercase and Engine that you like, and many people do.
Laughing Gas
Joined: Nov 2006
Posts: 909
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Originally Posted by blackhat620
Sorry but this is NOT true. NO Transmission fluid can meet both Mercon/MerconV and Mercon SP standards. The two fluids are not compatible and not interchangeable. Their chemical properties and charactieristics are different. The Kinematic and Brookfield Viscosities are substantially different for one thing. Also Ford has not licensed Amsoil or anyone else to make Mercon SP ATF.
Unfortunately this is some more bad one size fits all marketing from Amsoil.
Also it cost alot more than the OEM Motorcraft Synthetic Mercon SP.
Unfortunately this is some more bad one size fits all marketing from Amsoil.
Also it cost alot more than the OEM Motorcraft Synthetic Mercon SP.
Elder User
Joined: Feb 2003
Posts: 648
Likes: 1
The topic of another post awhile back was whether SP was synthetic, or not. While I thought that it was, I could find no documentation that Mercon SP is synthetic. Can anyone post a link or other evidence that it is?
Take Care
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Postmaster
Joined: Apr 2004
Posts: 2,654
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From: Bossier City, LA
Wish, not trying to start an arguement or rehash 59 pages of amsoil debate. My principal stance is it comes from the factory with full synthetic, so you are gaining nothing by making a lateral move to another synthetic. If it were a semi syn, or a regular conventional trans fluid, I would agree with you. In the case of the torqshift, it is just not the case, especially if you go and look at Jeffs blackstone report he did on his mercon SP.
Elder User
Joined: Feb 2003
Posts: 648
Likes: 1
Originally Posted by Btravelen
The topic of another post awhile back was whether SP was synthetic, or not. While I thought that it was, I could find no documentation that Mercon SP is synthetic. Can anyone post a link or other evidence that it is?
Take Care
Take Care
Take Care
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 11
From: Arizona
Originally Posted by WishIhada7.3
I never said it was compatible with mercon/mercon v but amsoils site does...they also claim it is able to be used where mercon sp is required. just because ford did not license them to make it doesnt mean they didnt find a way around it...amsoil would not reccomend the fluid if it caused damage or didnt do the same thing as SP...alot of people dont like amsoil products here but they make good oil PERIOD....they have been around for 35 years...BUT im not promoting them just telling the guy there are other options out there...it is not bad info if you think so that is YOUR opinion. But however i do think there add slogan about the extended drain intervals off the bat are a bad idea because you should get a OA but then again when people tell you they have 250-300k on there motor and have been running amsoil since day one something must be right.
For one both the Kinematic and Brookfield viscosities between Mercon/MerconV and Mercon SP are significantly different and are not interchangeable, there are other chemical characteristics and properties that are different as well (friction modifiers being one). These oils are Not interchangeable no matter what Amsoil would like you to believe.
As far as Amsoil recommending something, their marketing department will bend the truth at will to make a buck. As far as motors running 250-300K miles, motors will do this on any engine oil. Been doing it for years with standard dino oil.
The Amsoil is not licensed by FMC to make SP, Amsoil does not meet API/ASTM ratings of Mercon SP, Amsoil ATF costs more than Mercon SP.
Please list the benefits of Amsoil ATF over Mercon SP.