Emissions VIDEO: Why Do Diesel Engines Need EGR? Doug Kaufman discusses diesel engines and why even modern engines need an EGR system. Sponsored by Blue Streak. Advertisement ByDoug Kaufman on Jun 12, 2019 Doug Kaufman discusses diesel engines and why even modern engines need an EGR system. Sponsored by Blue Streak.AdvertisementClick Here to Read MoreAdvertisement Advertisement In this article:Diesel, egr, EGR System, video Click to comment Emissions: Clearing The Air About Diesel Exhaust Fluid (DEF) Emissions: Emissions 101: A Basic Understanding Of How Catalytic Converters Operate Emissions: 10 Commandments Of Catalytic Converter Replacement Emissions: Oxygen Sensor And Catalyst Efficiency Advertisement WEBINARS Watch a webinar for free on-demand! PODCASTS Listen to the latest Underhood Service podcast. SUBSCRIBE Stay up to date with the latest Underhood Service news.