Good Sam Club Open Roads Forum: Fifth-Wheels: Blue DEF
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3Fivers51

Litchfield

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Posted: 11/27/20 10:13am Link  |  Quote  |  Print  |  Notify Moderator

Just wondering about DEF for your diesel trucks. My dealer that I bought my truck from said just use Blue DEF and nothing else. I talked to another camper with a diesel truck and he said he buys the DEF from Wal-mart and it is not the 'Blue" Def and said it is quite cheaper. He also said that he has not had any problems with the Def he buys. Just getting opinions/facts from you diesel truck enthusiasts and see what you think. My nephew did mention to me that don't buy the DEF at truck stops at the pump because you don't know how long they have had it and also the the spigot could be dirty and he said you would need to make sure that spigot is clean!!!! Other than that I welcome anything to be said on this subject. Thanks so much!!! Bill

Lynnmor

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Posted: 11/27/20 10:19am Link  |  Quote  |  Print  |  Notify Moderator

DEF is DEF, buy whatever has the lowest price. I do have concerns with dirty nozzles at truck stops, but many use it with no problems. Walmart most likely has the best price on their own brand.





2oldman

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Posted: 11/27/20 10:35am Link  |  Quote  |  Print  |  Notify Moderator

Blue is fine for pulling a 5th wheel.

agesilaus

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Posted: 11/27/20 11:33am Link  |  Quote  |  Print  |  Notify Moderator

As noted DEF is DEF is DEF. It is all the same, save yourself some money and buy the $7 stuff from Walmart.


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BB_TX

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Posted: 11/27/20 11:36am Link  |  Quote  |  Print  |  Notify Moderator

No more DEF than I use and no more than it cost, I always buy the blue DEF and usually at Walmart. And don't bother with price shopping.

As for truck stop DEF, I have never bought it there although many do. And I have never heard of anyone having a problem with it. But even a busy truck stop, the DEF is never completely fresh. The tanker truck simply dumps the new into what ever old is still in the tank mixing it all together. That may be a lot of new mixed with a little old. Or a little new mixed with a lot of old. The concentration of old gets a little less each time, but never completely becomes new fresh stuff.

Bionic Man

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Posted: 11/27/20 11:46am Link  |  Quote  |  Print  |  Notify Moderator

DEF has an expiration date, as well as temperature storage requirements. If it is stored in an area that is too hot or too cold, the shelf life decreases.

The best way to get fresh DEF is to buy it in bulk from a high volume truck stop - at the pump. As an added bonus, you can fill your tank 100% each time (not guessing how much you have used), and it is also the least expensive way to buy.


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rhagfo

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Posted: 11/27/20 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

Lynnmor wrote:

DEF is DEF, buy whatever has the lowest price. I do have concerns with dirty nozzles at truck stops, but many use it with no problems. Walmart most likely has the best price on their own brand.

agesilaus wrote:

As noted DEF is DEF is DEF. It is all the same, save yourself some money and buy the $7 stuff from Walmart.

So you are both certified chemist that have tested all brands of DEF on all counts including purity.

The effects of less pure DEF likely will not appear right away, the same as using cheap engine oil will only build sludge which leads to issues down the road.
As often as I need to add DEF I will use a brand name.


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MNRon

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Posted: 11/27/20 03:43pm Link  |  Quote  |  Print  |  Notify Moderator

I have over 150,000 on my 2013 Silverado. Prefer to pump at truck stop because gets *full* and is cheaper. But have probably put in ~half of the DEF I’ve used from the blue boxes because of convenience. I usually have one in the back of truck when hauling 5er and often have ‘recycled’ it by filling tank and empty DEF container at truck stop.


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routeforty

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Posted: 11/27/20 04:48pm Link  |  Quote  |  Print  |  Notify Moderator

I always thought that the blue was off road DEF-like red diesel is off road diesel [emoticon]


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routeforty

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Posted: 11/27/20 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

[emoticon] [emoticon] [emoticon]

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