What is all this talk about clean diesel? Is it the fuel? Is it the engine technology? Is it the aftertreatment technology? Is it the push for cleaner emissions? Yes, it's all of the above. Clean diesel is a collaborative effort set forth by the EPA, carried out by OEMs, state and local governments, environmental and community organizations and the Federal government.

By Kevin S. McCartney. Kevin McCartney has compiled this comprehensive list of information related to modern oil additive and supplements. This is sure to be an interesting read full of new information for anyone interested in the science behind modern automotive oils.

By Kevin S. McCartney. Modern engines rely much more heavily on the lubrication system for cooling than ever before. Oil coolers and coolant heated PCV systems present some new opportunities. But, there is a great deal of overlooked technology in modern motor oils that should be understood before this opportunity is addressed.

By Scott 'Gonzo' Weaver. Sometimes, I’ll find faults with the so called “experts” advice or information. Not that I think I’m smarter than the engineers… no, not that at all. But if something strikes me as not being completely correct I might want to question what is on that diagnostic tree. Mind you, my entire day is filled with meeting the expectations of my customers. I have to be dead on with my repairs and diagnostics. Not some of the time, no, ALL the time. And, I expect the same from the people that provide the information and parts. The way I look at it, you’re only as good as the information provided.

By Scott 'Gonzo' Weaver. When I was a kid, I used to watch my dad, who started out as a diesel mechanic, tune up cars and trucks from time to time. He would turn the adjustment screws on the carburetor until the engine smoothed out and started to purr. Then, after listening closely to the rumbling of the motor, the adjustment screws would get one final tweak. He would always bend down and cup his hand around the belching tail pipe exhaust and take a big sniff of the fumes, and then go back to his adjustments. That was back in the 60s and 70s before PCMs, O2 sensors and catalytic converters.

By Dave Hobbs. A climate control system that automatically maintains a set interior climate while conditions outside constantly change might seem complicated. Cool-headed diagnostics involve breaking these systems into manageable parts.