15w-40 synthetic
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Senior User
Joined: Sep 2006
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From: Upstate NY
15w-40 synthetic
What do you guys and gals think of the different 15w-40 synthetics (any brands to stay away from, any with great results, anything I should know)
I am thinking about using the Royal Purple 15w-40 syn during the summer. I can get it for 20 bucks a gallon. I am using Rotella 5w-40 syn for the winter and I just don't like the idea of going back and forth between dino and synthetic and I don't want to tow with a 5w-40 here (sometimes it gets really hot in the summer).
I am thinking about using the Royal Purple 15w-40 syn during the summer. I can get it for 20 bucks a gallon. I am using Rotella 5w-40 syn for the winter and I just don't like the idea of going back and forth between dino and synthetic and I don't want to tow with a 5w-40 here (sometimes it gets really hot in the summer).
Senior User
Joined: Nov 2005
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From: Big Red country
There is no reason not to tow with it and use it year round. It is a syn not a dino oil, therefore it it a perfectly capable oil for those applications. Once hot, it will act like a 40 wt or there abouts anyway.
Either way, both oils, and many others too, are a good choice. Let your wallet decide.
Either way, both oils, and many others too, are a good choice. Let your wallet decide.
Elder User
Joined: Apr 2006
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From: Edmonton, AB
Why not just go with a 5W40 synthetic? Scafes is right. My understanding is most of the syn 15W40 are just marketed that way and are capable of better cold weather performance than the 15 suggests.
Fleet Mechanic
Joined: Oct 2007
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From: Henderson, NV
What do you guys and gals think of the different 15w-40 synthetics (any brands to stay away from, any with great results, anything I should know)
I am thinking about using the Royal Purple 15w-40 syn during the summer. I can get it for 20 bucks a gallon. I am using Rotella 5w-40 syn for the winter and I just don't like the idea of going back and forth between dino and synthetic and I don't want to tow with a 5w-40 here (sometimes it gets really hot in the summer).
I am thinking about using the Royal Purple 15w-40 syn during the summer. I can get it for 20 bucks a gallon. I am using Rotella 5w-40 syn for the winter and I just don't like the idea of going back and forth between dino and synthetic and I don't want to tow with a 5w-40 here (sometimes it gets really hot in the summer).
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Senior User
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From: Upstate NY
My problem I have is that Ford says to use 15w-40 if towing with the 6.0. They must have a legitimate reason for that, maybe I am putting too much confidence in the Ford engineers. Plus when the spread of the numbers are bigger isn't there a downside to that. I don't know, but thanks for the input so far.
-Dan
-Dan
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Once the engine is warm, there's no difference between 5W-40 and 15W-40.
The difference between the two is when the engine (and oil) are cold..... really cold, like well below freezing, where an SAE 15 grade oil is pretty darn stiff. Then, the 5W flows better, and makes cold starts a lot easier on the engine.
The difference between the two is when the engine (and oil) are cold..... really cold, like well below freezing, where an SAE 15 grade oil is pretty darn stiff. Then, the 5W flows better, and makes cold starts a lot easier on the engine.
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Senior User
Joined: Sep 2006
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From: Upstate NY
I don't mind a little extra hassle or money to do the best possible thing for my truck. I understand 5w-40 is fine for towing and you guys haven't had problems but is the Royal Purple 15w-40 better (little extra protection.) What company has the best or most widely used 15w-40 syn?
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Joined: Apr 2006
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From: Edmonton, AB
Mustangbru8,
Sign up here: Bob Is The Oil Guy - Powered by Motor Oil
and you will learn all you could ever want about oil. There are a couple of thoughts on oil, some guys are loyal to a brand for various reasons and some guys think oil is oil as long as it meets specification. I fall into the latter myself and buy oil based on viscosity and API rating. Its like deciding is Ford better than Dodge, you will eventually form your own opinion on oil too, but its for you to decide as best can be an extrememly subjective term.
Sign up here: Bob Is The Oil Guy - Powered by Motor Oil
and you will learn all you could ever want about oil. There are a couple of thoughts on oil, some guys are loyal to a brand for various reasons and some guys think oil is oil as long as it meets specification. I fall into the latter myself and buy oil based on viscosity and API rating. Its like deciding is Ford better than Dodge, you will eventually form your own opinion on oil too, but its for you to decide as best can be an extrememly subjective term.
Freshman User
Joined: Mar 2007
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Motorcract 5W-40
Ford dealerhips here in central CA have their new Motorcraft 5W-40 CJ-4 synthetic Diesel oil available now and are saying that it covers the full temperature range and uses of the dino 15W-40 Motorcraft. I've heard from other local suppliers that it is likely repackaged Mobil 1 but don't know. Ford has brochures showing specs.
So there should be no problem with use of 5W-40 in your truck. I have made the switch for my '06 F-250 used for towing all over the western states and Canada.
Mac
So there should be no problem with use of 5W-40 in your truck. I have made the switch for my '06 F-250 used for towing all over the western states and Canada.
Mac
Elder User
Joined: Apr 2006
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From: Edmonton, AB
Here is a recent oil poll that answers that question.
https://www.ford-trucks.com/forums/7...he-others.html
https://www.ford-trucks.com/forums/7...he-others.html
Fleet Owner
Joined: Nov 2003
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What do you guys and gals think of the different 15w-40 synthetics (any brands to stay away from, any with great results, anything I should know)
I am thinking about using the Royal Purple 15w-40 syn during the summer. I can get it for 20 bucks a gallon. I am using Rotella 5w-40 syn for the winter and I just don't like the idea of going back and forth between dino and synthetic and I don't want to tow with a 5w-40 here (sometimes it gets really hot in the summer).
I am thinking about using the Royal Purple 15w-40 syn during the summer. I can get it for 20 bucks a gallon. I am using Rotella 5w-40 syn for the winter and I just don't like the idea of going back and forth between dino and synthetic and I don't want to tow with a 5w-40 here (sometimes it gets really hot in the summer).