{"id":767,"date":"2025-07-08T10:10:58","date_gmt":"2025-07-08T10:10:58","guid":{"rendered":"https:\/\/blog.cedritech.com\/?p=767"},"modified":"2025-07-08T10:10:58","modified_gmt":"2025-07-08T10:10:58","slug":"why-were-subaru-diesel-engines-never-sold-in-the-us","status":"publish","type":"post","link":"https:\/\/blog.cedritech.com\/?p=767","title":{"rendered":"Why Were Subaru Diesel Engines Never Sold In The US?"},"content":{"rendered":"<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">Like many automakers, Subaru had its share of difficulties during the early years of the pandemic, but it has gotten its groove back since. After nearly a decade of growth from 2010 to 2019, U.S. sales took a nosedive in 2020 but started climbing up again in 2023.\u00a0The company would then ring up a streak of 33 straight months\u00a0of growing sales \u2013- which, however, did come to an\u00a0end in May 2025. Either way,\u00a0<a class=\"link \" href=\"https:\/\/www.jalopnik.com\/subaru-had-it-right-all-along-1851164584\/\" target=\"_blank\" rel=\"nofollow noopener\" data-ylk=\"slk:it's strong evidence that Subaru had it right along;elm:context_link;itc:0;sec:content-canvas\" data-rapid_p=\"41\">it&#8217;s strong evidence that Subaru had it right along<\/a>.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">Of course, that doesn&#8217;t mean Subaru gets it right every time. Remember the Subaru Tribeca? The brand&#8217;s first three-row SUV lasted from 2006 to 2014 before being cancelled due to &#8212; well, a lot of things, from a lack of space to the polarizing design. Another big idea from the company \u2013- diesel boxer engines \u2013- didn&#8217;t even get started in the United States. Although diesel-powered Subarus were available in a number of countries around the world from 2008 to 2020, none were ever sold in the U.S.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">It was a rare misstep for the company, but one that makes sense in retrospect. Subaru, like other automakers of the time, was struggling to reduce emissions in its diesel engines and eventually realized it wasn&#8217;t economically feasible. Other companies came to the same conclusion, but made the\u00a0<a class=\"link \" href=\"https:\/\/www.jalopnik.com\/vw-pays-242-million-settlement-in-england-over-diesel-1848975510\/\" target=\"_blank\" rel=\"nofollow noopener\" data-ylk=\"slk:costly mistake of trying to cheat the system instead;elm:context_link;itc:0;sec:content-canvas\" data-rapid_p=\"42\">costly mistake of trying to cheat the system instead<\/a>.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">Read more:\u00a0<a class=\"link  yahoo-link\" href=\"https:\/\/autos.yahoo.com\/cars-going-age-terribly-143000056.html\" data-ylk=\"slk:These Cars Are Going To Age Terribly;elm:context_link;itc:0;sec:content-canvas;outcm:mb_qualified_link;_E:mb_qualified_link;ct:story;\" data-rapid_p=\"43\">These Cars Are Going To Age Terribly<\/a><\/p>\n<h2 class=\"col-body mb-4 font-bold text-2xl md:text-3xl\">Reducing Diesel Emissions Is A Difficult Task<\/h2>\n<figure class=\"relative col-body mb-4\">\n<div class=\"relative\"><img loading=\"lazy\" decoding=\"async\" class=\"rounded-lg\" src=\"https:\/\/s.yimg.com\/ny\/api\/res\/1.2\/EnhSZ.tsqiH_hjGcuj7DhA--\/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTUzOQ--\/https:\/\/media.zenfs.com\/en\/jalopnik_622\/4e624530bef21ecc02b8d04ba8f6e2b5\" alt=\"Diesel exhaust fumes from a car\" width=\"780\" height=\"438\" data-nimg=\"1\" \/><button class=\"group absolute bottom-3 right-3 size-10 md:size-[50px] lg:inset-0 lg:size-full lg:bg-transparent\" aria-label=\"View larger image\" data-ylk=\"elm:expand;itc:1;sec:image-lightbox;slk:lightbox-open;\" data-rapid_p=\"8\" data-v9y=\"1\"><\/button><\/div><figcaption class=\"relative text-[0.875rem]\/[1.25rem] mt-1  line-clamp-2 pr-2.5\">\n<div>Diesel exhaust fumes from a car &#8211; Toa55\/Getty Images<\/div>\n<\/figcaption><\/figure>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">Diesel fuel has some important benefits over gasoline &#8212; including the fact it contains more energy per gallon &#8212; but unlocking that advantage also requires a slightly different process. In a gas engine, power is made when the spark plug ignites the fuel and air mixture in the cylinder head, causing it to combust.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">However, a diesel engine creates combustion from compression, where the fuel and air mixture spontaneously ignites just from being compressed by the piston. Either way, the process requires air from the world around us, which naturally contains nitrogen and oxygen. When those two elements come together during combustion, it forms a variety of dangerous nitrogen oxides &#8212;\u00a0there&#8217;s just no way around it.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">So all internal combustion engines create NOx emissions. Diesel engines, however, need much more air to mix with the fuel for combustion, and that means much more nitrogen and oxygen combining to create much more NOx. Needless to say, it&#8217;s not a healthy outcome. According to the\u00a0<a class=\"link \" href=\"https:\/\/www.lung.org\/clean-air\/outdoors\/what-makes-air-unhealthy\/nitrogen-dioxide\" target=\"_blank\" rel=\"nofollow noopener\" data-ylk=\"slk:American Lung Association;elm:context_link;itc:0;sec:content-canvas\" data-rapid_p=\"44\">American Lung Association<\/a>, the long list of concerns about NOx includes inflamed airways, reduced lung function, and increased asthma attacks. Some studies directly say it can lead to higher mortality rates. Of course, that didn&#8217;t stop\u00a0<a class=\"link  yahoo-link\" href=\"https:\/\/autos.yahoo.com\/trump-emissions-standards-dont-mean-133806750.html\" data-ylk=\"slk:Donald Trump from claiming that emissions standards don't make a difference to the environment;elm:context_link;itc:0;sec:content-canvas;outcm:mb_qualified_link;_E:mb_qualified_link;ct:story;\" data-rapid_p=\"45\">Donald Trump from claiming that emissions standards don&#8217;t make a difference to the environment<\/a>.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">To be clear, there are ways to reduce diesel emissions of NOx. The problem is they&#8217;re currently too expensive to implement in an affordable light-duty diesel car.<\/p>\n<h2 class=\"col-body mb-4 font-bold text-2xl md:text-3xl\">Subaru&#8217;s Diesel Engines Were Knocked Out By More Than Emissions<\/h2>\n<figure class=\"relative col-body mb-4\">\n<div class=\"relative\"><img loading=\"lazy\" decoding=\"async\" class=\"rounded-lg\" src=\"https:\/\/s.yimg.com\/ny\/api\/res\/1.2\/_oNZ1NTIYZR2D58XkyZzag--\/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTUzOQ--\/https:\/\/media.zenfs.com\/en\/jalopnik_622\/a8cecfe0a40c6325009e33b47c626ace\" alt=\"Engine crankshaft\" width=\"780\" height=\"438\" data-nimg=\"1\" \/><button class=\"group absolute bottom-3 right-3 size-10 md:size-[50px] lg:inset-0 lg:size-full lg:bg-transparent\" aria-label=\"View larger image\" data-ylk=\"elm:expand;itc:1;sec:image-lightbox;slk:lightbox-open;\" data-rapid_p=\"11\" data-v9y=\"1\"><\/button><\/div><figcaption class=\"relative text-[0.875rem]\/[1.25rem] mt-1  line-clamp-2 pr-2.5\">\n<div>Engine crankshaft &#8211; Alexandru Nika\/Shutterstock<\/div>\n<\/figcaption><\/figure>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">The key reason Subaru&#8217;s diesel-engined vehicles were never for sale in the United States was indeed that it would have cost too much to get them to meet this country&#8217;s strict emissions standards. Yet that may have been a blessing in disguise.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">It turns out that\u00a0<a class=\"link  yahoo-link\" href=\"https:\/\/autos.yahoo.com\/heres-why-subaru-still-uses-202500336.html\" data-ylk=\"slk:Subaru's long-running Boxer engines;elm:context_link;itc:0;sec:content-canvas;outcm:mb_qualified_link;_E:mb_qualified_link;ct:story;\" data-rapid_p=\"46\">Subaru&#8217;s long-running Boxer engines<\/a>\u00a0had some mechanical issues when configured for diesel\u00a0 &#8212;\u00a0at least anecdotally.\u00a0The main culprit seems to be the crankshaft. That&#8217;s the part of the engine that transfers the up and down motion of the cylinders into the rotational motion needed to drive a car&#8217;s wheels. The situation made the news in Europe as well, with the noted German car publication\u00a0<a class=\"link \" href=\"https:\/\/www.autobild.de\/artikel\/subaru-xv-i-gebrauchtwagen-test-16100549.html\" target=\"_blank\" rel=\"nofollow noopener\" data-ylk=\"slk:Auto Bild;elm:context_link;itc:0;sec:content-canvas\" data-rapid_p=\"47\">Auto Bild<\/a>\u00a0blaming issues on a faulty design for the crankshaft bearing and silicone getting into the crankcase when it was being assembled.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0\">However it happens, a bad crankshaft can lead to severe engine damage. If it breaks when you&#8217;re driving on the highway, and it causes you to lose control of the vehicle, it can be deadly.\u00a0So while it might be disappointing that the U.S. buyers never had a chance to own a diesel Subaru, it ultimately might have been for the best<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Like many automakers, Subaru had its share of difficulties during the early years of the pandemic, but it<\/p>\n","protected":false},"author":1,"featured_media":768,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[27,28],"tags":[],"class_list":["post-767","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-autos","category-life-autos"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/posts\/767","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=767"}],"version-history":[{"count":1,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/posts\/767\/revisions"}],"predecessor-version":[{"id":769,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/posts\/767\/revisions\/769"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=\/wp\/v2\/media\/768"}],"wp:attachment":[{"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=767"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=767"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cedritech.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}