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DEF fluid purchase suggestions

DEF fluid purchase suggestions

Postby airbalance [OP] » Jan 03 2011, 11:37pm

Just got this new truck and need to service the DEF fluid. Looking for suggestions on buying this stuff in bulk. Looks like it runs about a 1 per 1000 miles and looks like my cost is about $5.00 per gallon, is that good?
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Re: DEF fluid purchase suggestions

Postby LBZDMAX » Jan 04 2011, 2:26am

Your best bet is to buy it online. 5 bucks a gallon isn't bad if you're getting it locally. I've heard through the grapevine the cost of it will go down in a few months but there's no tellin.
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Re: DEF fluid purchase suggestions

Postby adams99z71 » Jan 04 2011, 4:43pm

i like using royal purpuil in my diffs, transfercase and radiator. for as often as i change the diff oil i dont mind spending a little more. also i use castrol high miliage engine oil and gm auto trans fluid.
nbs99 z71 325ci v8, stock 4wheel disc brakes, no cats, flow master classic 40 series, rhino line, custom fog lights, cb, bully dog tunner, 4:10 locker, airbag load leveling, 205,000miles.
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Re: DEF fluid purchase suggestions

Postby Z15 » Jan 04 2011, 4:46pm

adams99z71 wrote:i like using royal purpuil in my diffs, transfercase and radiator. for as often as i change the diff oil i dont mind spending a little more. also i use castrol high miliage engine oil and gm auto trans fluid.

DEF is diesel exhaust fluid

One customer told me he found it reasonable at a local NAPA, around $10 for 2.5 gallons but he is a commercial end user so his price may be better as he buys thousands of $$ in parts from them.

Be advised I seen a service bulletin warning of damage caused if you over fill the DEF. I'll see if I can find it again.

Diesel Exhaust Fluid Fill in Cold Weather
By Blog Post on November 1, 2010 3:39 PM | No Comments

When filling the Diesel Exhaust Fluid (DEF) on the 6.6L Duramax diesel engine available on the 2011 Silverado and Sierra HD trucks and 2010 interim and 2011 Express and Savana vans, it's important to not overfill the DEF tank.

TIP: With colder weather coming, keep in mind that DEF behaves like water and will freeze at 12°F (-11°C) and will expand.

Adding more than the 5.3 gallon (20 liter) usable capacity may not allow for DEF expansion if it freezes.

DEF will not be damaged by freezing, and will remain fully usable when thawed. The fluid tank includes a DEF pump heater, reservoir heater and line heater.

Vehicles are shipped with 2 gallons (7.5 liters) of DEF from the assembly plant. To prevent damage from freezing, at customer delivery or during PDI, do not add more than approximately 3.3 gallons (12.5 liters) of remaining capacity.

The 5.3 gallon (20 liter) capacity of the DEF tank will last approximately 5,000 miles (8,000 km) depending on drive cycles and vehicle use. The easiest way for customers to ensure that the tank is not overfilled is to wait until the EXHAUST FLUID RANGE: 1000 MILES (1600 km) message is displayed on the Driver Information Center. At this approximate mileage, add no more than 3.5 gallons (13 liters) of DEF. When fluid reaches the top of the fill pipe, stop filling.


- Thanks to B.J. Lackey
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Re: DEF fluid purchase suggestions

Postby adams99z71 » Jan 04 2011, 5:07pm

so anyone taking bets about how long until someone asks how to disable the def system?
nbs99 z71 325ci v8, stock 4wheel disc brakes, no cats, flow master classic 40 series, rhino line, custom fog lights, cb, bully dog tunner, 4:10 locker, airbag load leveling, 205,000miles.
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Re: DEF fluid purchase suggestions

Postby LBZDMAX » Jan 04 2011, 5:12pm

adams99z71 wrote:so anyone taking bets about how long until someone asks how to disable the def system?


Oh it's all over the Duramax Forum. There was a thread about it the day the LML was available.
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