and would stick with what Ford recommends. My $.02.
Question - 10w30?
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Junior User
Joined: Apr 2004
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From: Williamsburg, VA
Question - 10w30?
A buddy of mine suggested running 10w-30 Mobil 1 in my V-10. He uses it in his 2500 GMC pickup because he does alot of towing. I tow a 28ft travel trailer with my X.
Is there really that much difference in the "ford suggested" 5w-30 and 10w-30?
I want maximum engine protection not maximum fuel mileage, heck its a v-10 I don't really care about the mileage anyway?
Also, while at wally world today, I saw that Mobil 1 now has a truck and SUV 5w-40 oil for "hard working trucks and SUVs". Any thoughts?
Thanks,
Jeff
Is there really that much difference in the "ford suggested" 5w-30 and 10w-30?
I want maximum engine protection not maximum fuel mileage, heck its a v-10 I don't really care about the mileage anyway?
Also, while at wally world today, I saw that Mobil 1 now has a truck and SUV 5w-40 oil for "hard working trucks and SUVs". Any thoughts?
Thanks,
Jeff
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
The engine spec is 5w20 for the oil. You can run 5w30 in it without issue... The problem is that these engines are really tight... Thicker oils may not be able to make it through the oil passages, and you could have a dead engine on your hands in a very short amount of time.
Logistics Pro
Joined: Feb 2005
Posts: 3,529
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From: SEVA
Ain't it funny how a lot of people believe things just 'cause the factory said so. I've found errors in the Ford factory service manuals for my '01 X ... and one of the errors was about an industry standard! Fortunately in that situation I found the truck to be wired per industry standard, and the Ford wiring diagram was just flat wrong.
The V10 ain't built to tighter specs than any other production line engine. Pull one apart and measure just the variance in deck heights from one end of the block to the other. And guess which oil the factory specifies for the X / F250 / F350 in those countries that do not have 5W-20 or 5W-30? Yep! Same stuff I run ... 10W-30. I believe the 5W oils are barely sufficient for my wife's Singer sewing machine.
The V10 ain't built to tighter specs than any other production line engine. Pull one apart and measure just the variance in deck heights from one end of the block to the other. And guess which oil the factory specifies for the X / F250 / F350 in those countries that do not have 5W-20 or 5W-30? Yep! Same stuff I run ... 10W-30. I believe the 5W oils are barely sufficient for my wife's Singer sewing machine.
Mountain Pass
Joined: Aug 2004
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i'm with cfi , like ford really cares what happens once the warrenty is up.i use 10-30 mobil 1 and have had no issues in any of my trucks.and i change the oil every 7500 miles.as for the v10's being tighter than other moters i dont beleave that for one second.the 5w-20 is just a way to increase fuel milage a very very tiny bit.i'v been running 15w50 in my vett for years and in the summer wouldent think twice abouit running it in my truck.
pete
pete
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Originally Posted by V10_X
Is there really that much difference in the "ford suggested" 5w-30 and 10w-30?
Also, while at wally world today, I saw that Mobil 1 now has a truck and SUV 5w-40 oil for "hard working trucks and SUVs". Any thoughts?
Thanks,
Jeff
Also, while at wally world today, I saw that Mobil 1 now has a truck and SUV 5w-40 oil for "hard working trucks and SUVs". Any thoughts?
Thanks,
Jeff
As far as Mobil-1 anything, snake oil....pure and simple. Run regular old dino oil, change it often, live happy.
Rev
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We have a number of vehicles and equipment 5.4's/ psd/kubota/kohler v-twins every ones says something different about grades. It get's into the high 80's summer to -30 in the winter. Since 2001 we just buy pails of Shell Rotella T 10w-40 semi-synthetic and winter switch to 0w-40 in evertything. The lowest milage vehicle has 73,000 the highest 270,000 and no issues.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
Originally Posted by Rev Den
5W-30 is simply thinner when cold than 10W-30, at hot they are virtually the same.
That Myth, however, floats all over the internet, garages & workbenches throughout the land. Oil does NOT thicken when hot.
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Originally Posted by Monsta
That statement is untrue. That Myth, however, floats all over the internet, garages & workbenches throughout the land.
Oil does NOT thicken when hot.
That Myth, however, floats all over the internet, garages & workbenches throughout the land. Oil does NOT thicken when hot.
True. Oil does not thicken when hot!!!! 5W-30 is a thinner oil than 10W-30.
Newer cars & some trucks specify thinner oil due to tighter bearing clearances
10W-30 is said to be a better lubricating oil than 10W-40, because 10W-30 has more oil base & less additives than 10W-40???? I would use weight specified in owners manuals, there are many hours and tests done by manufactures to ensure what is best under all conditions. I refered to owners manual for 26 years and many rides with no problems. Thats my 2 Cents worth.
Last edited by mopar; May 12, 2005 at 03:24 PM.
Junior User
Joined: Jan 2004
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Originally Posted by V10_X
A buddy of mine suggested running 10w-30 Mobil 1 in my V-10. He uses it in his 2500 GMC pickup because he does alot of towing. I tow a 28ft travel trailer with my X.
Is there really that much difference in the "ford suggested" 5w-30 and 10w-30?
I want maximum engine protection not maximum fuel mileage, heck its a v-10 I don't really care about the mileage anyway?
Also, while at wally world today, I saw that Mobil 1 now has a truck and SUV 5w-40 oil for "hard working trucks and SUVs". Any thoughts?
Thanks,
Jeff
Is there really that much difference in the "ford suggested" 5w-30 and 10w-30?
I want maximum engine protection not maximum fuel mileage, heck its a v-10 I don't really care about the mileage anyway?
Also, while at wally world today, I saw that Mobil 1 now has a truck and SUV 5w-40 oil for "hard working trucks and SUVs". Any thoughts?
Thanks,
Jeff
NO. 5W-30 oil is to thin. I have always used weight specified in owners manuals and havent had any problems yet!!!!! I run Mobile 1 10W-30 in my 87 T-Bird Turbo coupe (2.3 L Turbo 4) & Valvoline 10W-30 in my 85 F-150 4X4 (5.8 L 4V H.O.). Both oils keep consistant and even oil pressure. T-Bird has 78,000 & 4X4 has 144,000.
Junior User
Joined: Nov 2004
Posts: 84
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Originally Posted by Monsta
That statement is untrue. That Myth, however, floats all over the internet, garages & workbenches throughout the land.
Oil does NOT thicken when hot.
That Myth, however, floats all over the internet, garages & workbenches throughout the land. Oil does NOT thicken when hot.
Rev
Mountain Pass
Joined: Apr 2004
Posts: 137
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I agree with REVDEN. 5w has thinner viscosity ( def= viscosity, refers to how thick or thin the oil is) than 10w when cold. but when the oil is warm/hot 5w-30 has the same viscosity as 10w-30. As the engine accumulates mileage and start to burn oil it is time to use heavier viscosity to let say 10w-40.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
No, gentlemen, it does not.
The base oil is ALWAYS the first number.
The second number simply denotes that the base oil will not thin anymore than the second number (weight oil) would when hot. Think of the second number as a percentage NOT as a weight oil. (Although it is NOT a percentage!)
Eg.
If a 30 weight oil thinned 25% at 300°, then the base stock oil (5W) of 5W-30 oil will not thin more than 25% at 300°.
Does that make sense?
It can be a bit confusing. Hence, all the myths out there.
Both or your statements make it seem as if the base oil thickens to what a 30W oil would be when hot. It just doesn't work like that.
-----------
Oh and if your truck starts to burn oil, it is time for a ring or valve guide job.
The base oil is ALWAYS the first number.
The second number simply denotes that the base oil will not thin anymore than the second number (weight oil) would when hot. Think of the second number as a percentage NOT as a weight oil. (Although it is NOT a percentage!)
Eg.
If a 30 weight oil thinned 25% at 300°, then the base stock oil (5W) of 5W-30 oil will not thin more than 25% at 300°.
Does that make sense?
It can be a bit confusing. Hence, all the myths out there.Both or your statements make it seem as if the base oil thickens to what a 30W oil would be when hot. It just doesn't work like that.
-----------
Oh and if your truck starts to burn oil, it is time for a ring or valve guide job.