{"id":1386,"date":"2024-12-27T23:39:06","date_gmt":"2024-12-27T20:39:06","guid":{"rendered":"http:\/\/www.magaripoa.com\/?p=1386"},"modified":"2024-12-27T23:39:06","modified_gmt":"2024-12-27T20:39:06","slug":"should-you-allow-a-diesel-engine-to-warm-up-before-driving-off","status":"publish","type":"post","link":"https:\/\/www.magaripoa.com\/gari\/should-you-allow-a-diesel-engine-to-warm-up-before-driving-off\/","title":{"rendered":"Should you allow a diesel engine to warm up before driving off?"},"content":{"rendered":"<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">No. You should depart <i>immediately, but slowly<\/i>. This is true for both diesel and petrol engines.<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">Idling a cold engine and waiting to warm-up before departing reduces the engine life. Why? <i>Precisely because<\/i> the engine shouldn\u2019t run cold. Let me explain.<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">When idling at, say, 750 rpm, the engine warms up very slowly, especially if the engine is diesel. It will take, say, 15 minutes of idling to warm up. 15 \u00d7 750 = 11,250 revolutions. This means that all of the moving components made 11,250 cold, component-wearing revolutions.<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">If you depart immediately but slowly and drive at, say, 1500 rpm, the engine will reach proper temperature <i>much <\/i>sooner, after only, say, 5 minutes. 5 \u00d7 1500 = 7,500 revolutions. This means that all of the moving components made only 7,500 cold, component-wearing revolutions.<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">If you depart immediately and aggressively, the engine will heat-up even sooner, making even less revolutions cold, but the load on the components will offset the quick warm-up benefits.<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">Counter-intuitively, the colder the weather, the more damaging idle warming is: the already long idle warm-up time is even longer. So, in winter, it is even more important to depart immediately but slowly.<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">So, if we we order the start-up styles from the most damaging to the least damaging:<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">1. Cold engine, aggressive start (most damaging)<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">2. Cold engine, waiting to warm-up while idling (moderately damaging)<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">3. Cold engine, immediate slow departure (least damaging).<\/span><\/p>\n<p class=\"qtext_para\" style=\"text-align: justify\"><span style=\"font-size: 12pt;color: #333333\">I understand this is counter-intuitive (many things about cars are!), but if you really think about it makes perfect sense.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>No. You should depart immediately, but slowly. This is true for both diesel and petrol engines. Idling a cold engine and waiting to warm-up before departing reduces the engine life. Why? Precisely because the engine shouldn\u2019t run cold. Let me explain. When idling at, say, 750 rpm, the engine warms up very slowly, especially if&#8230;<\/p>\n","protected":false},"author":1,"featured_media":1387,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","cybocfi_hide_featured_image":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1674],"tags":[],"class_list":["post-1386","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-driving-advice"],"jetpack-related-posts":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pej6K6-mm","jetpack_likes_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.magaripoa.com\/gari\/wp-content\/uploads\/temperature-gauge-magaripoa.jpg?fit=1000%2C664&ssl=1","_links":{"self":[{"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/posts\/1386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/comments?post=1386"}],"version-history":[{"count":0,"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/posts\/1386\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/media\/1387"}],"wp:attachment":[{"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/media?parent=1386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/categories?post=1386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.magaripoa.com\/gari\/wp-json\/wp\/v2\/tags?post=1386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}