what oil weight
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Senior User
Joined: Dec 2005
Posts: 182
Likes: 0
From: Grand Rapids, MI
what oil weight
for all you guys getting 18-20mpg on the highway, what weight oil are you running? 15w40?
I had my first oil changed at the dealership cause it was free, but they put 15w40 in my truck, and now i 14.5mpg-highway compared to 17.5mpg highway with the oil from the factory.
I can't wait to get to the next oil change interval to go to a 10w30 or 10w40
I had my first oil changed at the dealership cause it was free, but they put 15w40 in my truck, and now i 14.5mpg-highway compared to 17.5mpg highway with the oil from the factory.
I can't wait to get to the next oil change interval to go to a 10w30 or 10w40
Senior User
Joined: Dec 2003
Posts: 327
Likes: 0
From: newark,de
I don't know for a fact but I was told that the original oil from the factory was the lighter weight 10w-30. If you tow or drive in temps higher than 50 degrees the recommended weight is 15w-40. I was in wyoming and had my oil changed at the dealer in 90 degree temps and they put in the 10w-30 which I immediately had them remove and put back the 15w-40 because I was towing a 34' trailer in extreme heat conditions. My mpg solo is running around 16-17.
Junior User
Joined: Nov 2005
Posts: 88
Likes: 0
From: Missouri City, TX
Originally Posted by 06F250XLTFX4
for all you guys getting 18-20mpg on the highway, what weight oil are you running? 15w40?
I had my first oil changed at the dealership cause it was free, but they put 15w40 in my truck, and now i 14.5mpg-highway compared to 17.5mpg highway with the oil from the factory.
I can't wait to get to the next oil change interval to go to a 10w30 or 10w40
I had my first oil changed at the dealership cause it was free, but they put 15w40 in my truck, and now i 14.5mpg-highway compared to 17.5mpg highway with the oil from the factory.
I can't wait to get to the next oil change interval to go to a 10w30 or 10w40
Junior User
Joined: Nov 2005
Posts: 88
Likes: 0
From: Missouri City, TX
I just had my first oil change this week. I filled up right after it so I will be able to see what, if any difference it makes. Geez, I am glad I don't go to the dealer to get my oil changed on a regular basis. Oil change and rotate tires was $135 of which the oil change was $103. Glad it was only once there.
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Senior User
Joined: Apr 2005
Posts: 217
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From: NH
Originally Posted by RickKimbrell
I just had my first oil change this week. I filled up right after it so I will be able to see what, if any difference it makes. Geez, I am glad I don't go to the dealer to get my oil changed on a regular basis. Oil change and rotate tires was $135 of which the oil change was $103. Glad it was only once there.
they do all the diesel ambulances in my area so I know they know what they are doing, I've tried jiffy lube a few times and had terrible experiences there..
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Super Moderator
Joined: Jul 2004
Posts: 21,113
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From: Ohio
Originally Posted by 06F250XLTFX4
may i just got a bad batch of fuel, I'm going start filling up at the truck stop...even if its 5-10 cents more a gallon
Senior User
Joined: Apr 2005
Posts: 245
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From: Texas
I've posted in some other threads how dealership prices can vary greatly. I pay $58 for an oil change at my dealership (Moto 15/40). I priced another dealer in the area an they wanted over $90. But $103 is the highest I have heard of - and outrageous!
Senior User
Joined: Sep 2004
Posts: 235
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From: S.W. Michigan
I run Delcac 1300 15W/40 in my 04/04 F250 SC SB FX4 TS. My average over the last month or so of combined city/highway driving is 17.1 mpg. The range per tank is from 16.3 to 17.4 mpg with a total of 3222 miles and 188.5 gallons of fuel. I run 67.5 mph on the freeway, and my daily route is 4 miles city, 20 miles two lane roads, and 50 miles freeway.
The biggest drop in mileage I see is when I am fighting a head wind and when the truck idles for a while. I had 19.0 mpg trip average the other day (over 37 miles) then I stopped into the local pizza place and left the truck running. 7 minutes later, that same trip average had dropped to 17.5 mpg.
The biggest drop in mileage I see is when I am fighting a head wind and when the truck idles for a while. I had 19.0 mpg trip average the other day (over 37 miles) then I stopped into the local pizza place and left the truck running. 7 minutes later, that same trip average had dropped to 17.5 mpg.
Lead Driver
Joined: Jan 2005
Posts: 7,782
Likes: 221
From: Huntington Indiana
Watch the cetane level you are running. The min is 40 but these engine like the better quality fuel. i currently run 51 cetane and boy do I have power and MPG. I average around 18 overall (summer and winter )
Freshman User
Joined: Mar 2006
Posts: 29
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Originally Posted by bigredtruckmi
Watch the cetane level you are running. The min is 40 but these engine like the better quality fuel. i currently run 51 cetane and boy do I have power and MPG. I average around 18 overall (summer and winter )
Lead Driver
Joined: Jan 2005
Posts: 7,782
Likes: 221
From: Huntington Indiana
have it delivered and here is their web site page for the product I get.https://www.crystalflash.com/files/C...iesel%20XC.jpg