New Mobil 5W40 Synthectic

[FPoitra]

I was in Wally World last weekend and saw Mobil 1 5W-40 Truck and SUV synthetic for gas and diesels. It says it is CI-4 rated, which is what our manuals call for. Is this stuff new or have I not noticed it? With my gassers, I lived by Mobil 1 synthetics. Its either going to be Rotella 5w40 synthetic or Mobil 5w40 synthetic. I need the synthetic oil for better start-ups when it starts to get -30 F. Any experience or input for the mobil. Thanks in advance.

 

[Cooker]

This is the exact same oil as Mobil Delvac 1 just in a different container. The Delvac 1 has proven itself to be an excellent oil. If you are choosing between the Mobil and the Rotella, definitely pick the Mobil.



Just curious, what was it priced at?

 

[FPoitra]

It was around 4. 69 a quart. So does Mobil even still sell Delvac 1 5w40 synthetic anymore? Their website still says they are two different oils. Go figure??

 

[MLee]

Its the same oil just different maketing stratagy, in more markets, new packageing. It was disscussed six months ago here.

Marv.

 

[nickleinonen]

mobil delvac1 = 1 gallon or bigger tubs

mobil1 truck & suv = 1 quart containers...



thats pretty much the difference. now if only it will come to canada

 

[Rosco]

Like MLee said, it's a marketing stratedgy. Most people have never heard of "Delvac1" but many have heard of "Mobil1". Out of personal curiousity I went to Mobil's website and compared the two oils and they both appear to have identical properties.



I recently switched to Delvac1 in my truck but I had to order it online. It cost me $26 a gallon and it's sold by the case (4 gallons) only. Fortunetly, I just found a nearby Mobil oil distributor who will deliver to my house for free if my order exceeds 100 dollars. So from now on I will just order 2 cases and get the free delivery or drive the forty minutes needed to pick it up.



Unfortunetly, I have not been able to find the Truck&SUV oil locally. I've checked both Wal Mart and the local auto parts stores. It would be nice to have one quart on hand in the rare event I need to top off my crankcase.

 

[jersey diesel]

right wt. oil

I yhought our 3rd gen engines called for 15 40 not 5 40 wt oil. What gives. tks. steve

 

[p-Bar]

I yhought our 3rd gen engines called for 15 40 not 5 40 wt oil. What gives. tks. steve

Ya that 5w part scares me a little to thin for me. I would check with Cummins on that one.



Don

 

[TheWolf]

he is going to use it for winter oil, for easier starts. just as I am going to do. getting it at wally wold at 4. 77/ qt. Only 1 of the 3 wally worlds around me is carrying it. . !

 

[rbattelle]

I believe if you're going full-synthetic then 5w-40 is okay. Generally, however, full synthetic is only recommended for very very cold areas. When I first got my truck I phoned the local Cummins service center and asked if they thought I should run full synthetic in the winter. They emphatically replied "no", and that 15w-40 was quite fine. If you plug in the block heater, it's even less of an issue.

-Ryan

 

[Cooker]

For quite some time I was a 15w40 oil kind of guy myself. Depending on the severity of your winters it may be a fine oil to run year round. If I lived in a southern climate I would probably still be running a 15w40.



The benefits of a synthetic 5w40 during the cooler months are far to great for me to give now. Easier, quiter starts, with the oil pressure coming up much quicker tells me the truck really likes the 5w on the cold winter days when I was unable to plug it in. On the occassional times that I do sample the oil the analysis come back better than when I was running a 15w40.



There is absolutely no worry running a quality synthetic 5w40. Even Cummins/Valvoline have produced a Premium Blue 5w40 I'm sure after they began to realize the benefits of this grade of oil.

 

[Gauthier]

Does the block heater help much to raise the oil temperature? It seems like it wouldn't do much being only 750 watts, only heating the coolant and even the coolant passages are are well above the oil in the sump. Anyone do any actual oil temperature checks with and without the block heater?



Thanks!

 

[FPoitra]

5w40 synthetic exceeds the API CI-4 rating on the back of the bottle, including Cummins, Duramax, and Powerstroke along with Detroit Diesel. This is the main thing that matters to me. If it meets or exceeds that rating, it is ok to use in our engines. This is what the owners manual says. Mobil's website also says that synthetic not only benefits cold weather start ups, but also handles higher temps better as well against viscosity breakdown. Either way you look at it, a synthetic will protect just as well all year round, summer or winter. With Mobils track record, I will pay the extra money for the extra piece of mind knowing my engine is well protected when it gets below zero. Thanks for chiming in and giving input, I will buy the Truck and SUV 5w40 synthetic and change out in November.

 

[Jeremiah]

Mobil 5w40

I run Mobil Delvac 5w40 synthetic year-round and my truck doesn't notice the difference winter or summer. With the block heater, it starts at -20 degrees in a matter of seconds regardless of the oil used. In the summer it runs well no matter what I tow.



However, the impact on my wallet is another matter. $70 plus change for 3 quarts probably isn't justified. Should I continue using it? Probably not.



Why haven't I switched back to Rotella like 90 percent of the people who haven't switched to synthetic? I dunno. Maybe I need therapy.

 

[Cooker]

If it is not windy and the block heater is plugged in for 2 hours or more my engine oil sometimes reaches 80-90 degrees. Obviously it depends on the ambient air temp and how long the block heater has been plugged on wheter the oil temp will be affected by the block heater but it can heat the oil under the right conditions.

 

[klenger]

$70 plus change for 3 quarts

Wow, that is steep! :-laf

 

[rbattelle]

If I lived in an area farther North with colder winter temps, I would run synthetic. According to the chart in my user's manual, 15w-40 can be used down to 0F. With a block heater, of course, ambient temp can be MUCH lower than that. It's rare in my area for temperatures to get that low.



Now, if only I could find a way to heat my engine while it's parked at work... hmmmm...



-Ryan

 

[Jeremiah]

I plug in anytime the temperature falls below 20 degrees F. , which, in Colorado's high country, is every night from late October to April or May.

 

[LightmanE300]

If it is not windy and the block heater is plugged in for 2 hours or more my engine oil sometimes reaches 80-90 degrees. Obviously it depends on the ambient air temp and how long the block heater has been plugged on wheter the oil temp will be affected by the block heater but it can heat the oil under the right conditions.

Cooker, how do you suppose you know what your oil temperature is? The block heater only heats the coolant.

 

[LightmanE300]

I was in Wally World last weekend and saw Mobil 1 5W-40 Truck and SUV synthetic for gas and diesels. It says it is CI-4 rated, which is what our manuals call for. Is this stuff new or have I not noticed it? With my gassers, I lived by Mobil 1 synthetics. Its either going to be Rotella 5w40 synthetic or Mobil 5w40 synthetic. I need the synthetic oil for better start-ups when it starts to get -30 F. Any experience or input for the mobil. Thanks in advance.

Yes as mentioned above, the truck and suv oil is repackaged d1, which is far superior to rotella anything. If you don't mind the cost, it's the best thing for your truck.



As for those that say 5w is too thin, maybe they don't understand oil. 40 is the weight, 5w is the measure of how well it protects at cold startup. There is no downside to 5w40 vs 15w40 in a high quality synthetic.