زيت المحرك

 

ُيعد زيت السيارات هو دم المحرك والذي يعمل على تقليل الاحتكاك والتآكل بين أجزاءه بالإضافة إلى أنه يقوم بتبريد وحماية المكونات الحيوية لسيارتك كما يعمل على تحسين كفاءة وعمل المحرك

غالباً ما تكون محاولة اختيار زيت مناسب لسيارتك أمراً مرهقاً بسبب وفرة الخيارات بغض النظر عن نوع السيارة التي تقودها أو موديلها أضف إلى ذلك تصبح الأمور محيرة عندما تضطر إلى الاختيار بين نوعين وخاصةً عندما تجد أن دليل المالك الخاص بسيارتك يوصي باستخدام كلا النوعين

سوف نأخذ مثال للمقارنة بين نوعين من الزيت و الإختلاف هو في اللزوجة مثال :

  • 10W40
  • 20W50

 

إن لزوجة زيت المحرك هي التي تشير إليها الأرقام وبالتالي من المهم أن تفهم أولاً ما تعنيه هذه الأرقام لشراء الزيت المناسب ونعلم الفرق بين زيت 20w50 و 10w40 كما يلي:

 

  1. يشير الرقم في الجهة اليسرى إلى لزوجة الزيت عند درجات الحرارة المنخفضة وكلما انخفض الرقم كلما كان الزيت رقيقاً وأكثر تدفقاً، من ناحية أخرى فإن حرف (W) يدل على الشتاء .

  2. يشير الرقم في الجهة اليمنى إلى لزوجة الزيت عند درجة حرارة التشغيل العادية وكلما ارتفع الرقم كلما كان الزيت سميكاً وأقل تدفقاً .

  3. يحافظ الزيت السميك على أجزاء المحرك بشكل أفضل من الزيت الرقيق في الظروف القاسية، من ناحية أخرى قد يسبب ارتفاع سماكة الزيت إلى منع تدفقه بحرية إلى أجزاء المحرك .

  4. تتراوح لزوجة زيت 20w50 من 16.3 إلى 21.8 ملم مربع لكل ثانية بينما تتراوح لزوجة زيت 10w40 من 13.2 إلى 17 ملم مربع لكل ثانية .

 

نتيجة لذلك ومن خلال النقاط السابقة يتضح لنا بأن زيت 20w50 له لزوجة أكبر لذلك فإن زيت 10w40 أرق وأكثر تدفقاً وانتشاراً داخل المحرك.

 تغيير زيت المكينة - مايز لصيانة السيارات

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