LLY Upgrade solutions remain one of the most discussed topics among Duramax owners because the 2004.5–2005 LLY Duramax is a bit of a paradox. The engine under the hood is a 6.6-litre turbo-diesel V8 that produces impressive power and durability. However, the LLY became a less-than-desirable choice for those who owned trucks because of one thing: overheating. The LLY is not … [Read more...]