LMM Reliability
Engine-wise, there are no major issues with the LMM as it was practically the same as the LBZ. With that said, the overall reliability of the truck it was installed in could be regarded as a step back due to the problems associated with the DPF and it took a few years to iron them out.
How long will a LMM Duramax last?
Overall, a properly cared-for Duramax engine should last over 300,000 miles. However, consumers report having Duramax’s lasting in the 500,000-mile range! Nonetheless, proper maintenance is a must to increase the life expectancy of your engine.
What years of Duramax to avoid?
The Duramax has a long history. We recommend avoiding any GM vehicle equipped with the 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, and 2010 Duramax engines. In short, the newer model years show improved performance.
How reliable is the LML Duramax?
Aside from the CP4. 2 injection pump, LML Duramax was a reliable motor that could last 300,000 to 400,000 miles when properly maintained.
Are LMM Duramax reliable? – Related Questions
What year model Duramax is best?
Some engines are more popular than others. For example, the pre-emissions Duramax engines made between 2001 and 2007 are highly sought-after for superior reliability. On the other hand, the more modern engines add more horsepower, torque, and upgrade capability with Duramax performance parts.
What year is LMM Duramax?
The LMM (engine code “6”) debuted part way through 2007 and ended production with the start of the 2011 calendar year and is mated to the 6-speed Allison transmission. The LMM was the only Duramax offered for model years 2007–2010.
How common is LML cp4 failure?
Out of all the LML’s there has been less than a 5% failure rate is what I read on one of the forums from a dealer.
How long do LML injectors last?
The average lifespan of a diesel fuel injector is around 100,000 miles.
Is the 6.6 L Duramax reliable?
Duramax Engines have an excellent reputation for reliability. Each model year is associated with problems, especially when the engines reach 100,000+ miles. However, while Cummins engines may continue to edge out Duramax in terms of overall reliability, Duramax fans love their higher horsepower.
How much HP can a LML handle?
On the plus side, the piezoelectric injectors in the LML can support more horsepower, pound-for-pound, than the ’01-’10 solenoid valve injectors can, so once you find more high-pressure fuel volume (and air in the form of a bigger turbo) the factory injectors can easily support more than 600rwhp.
How long should you let a Duramax warm up?
As a general rule of thumb, if it is below zero degrees Fahrenheit, you should allow your engine up to seven minutes to warm up. If the temperature is between zero and fifty degrees, the warm-up period should be three to five minutes. Over fifty degrees will only require one or two minutes to warm up.
How much power can a LMM handle?
In best-case scenarios, the LMM’s stock turbo, injectors and CP3 high-pressure fuel pump can support 530 to 540rwhp.
Do I need a lift pump on my LML Duramax?
Either way, a lift pump is required to make anything over *500 RWHP with your LML. The reality is that the pump simply can’t keep up without a lift pump if you want more power than that. From our testing, we have found the peak horsepower with a stock turbo is 520 RWHP if you want to keep your LML reliable.
How much does it cost to CP3 swap LML Duramax?
The cost of doing just the LML CP4. 2-to-CP3 conversion is about $3,500 for parts and labor.
Can a LML Duramax run biodiesel?
“True biodiesel is created through transesterfication and that’s what the Duramax 6.6L is designed to use,” said Coleman Jones, GM biofuels implementation manager.
How much HP can a Allison 1000 handle?
Allison 1000, Six-Speed (‘07.5-’10)
By the time the LMM-powered GMs hit the market, aftermarket tuning of the TCM had progressed enough to where the Allison could withstand 430 to 450-rwhp for extended periods of time—and 500-rwhp on occasion.
How hot is too hot for an Allison 1000?
Temperatures from 230-240 have been reached with no damage to the transmission. If you are seeing temps above 225 degrees on a regular basis you should check your fluid level. Fluid levels to high may cause excessive temperature.
What is the most powerful Duramax?
On May 9, 2007, DMAX announced the production of its 1,000,000th Duramax V-8 engine, the most powerful engine on the market in the segment.
Does the Allison 1000 have a 6th gear?
A new “Generation 4” 1000 was introduced in 2005 that added a 6th gear at the very top of the ratio ladder, making it a double-overdrive.
How often should you change Allison 1000 transmission fluid?
Although GM recommends the Allison 1000 trans fluid and external filter be changed when the HD’s oil monitor says – or every 25,000 miles for HDs used in severe service – Rod Halsten, a GM master technician in Tuscaloosa, Alabama, says let the trans fluid color and smell be the fluid-change indicators.