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5W-40 is a disadvantage in any engine. Multi-viscosity oil has viscosity index improvers to make it more resistant to flow when the engine is up to temperature so it acts like a 40 weight oil.
The problem with wide spaced viscosity grades is the following: Polymers are used as viscosity index improvers. After you get 2000 miles on the oil it no longer flows like a 5 Winter grade when the temperature is cold. The more miles you get on the oil the cold viscosity (5W) begins to rise.
The closer the viscosity spread the better.
Who ever dumped that oil in your car should be slapped, with cold weather around the corner.
Over 80% of all engine wear occurs during cold starts. The thinner the oil at low temperatures the faster the oil pump forces a *larger volume of lubricant to all frictional surfaces.
Multi-Viscosity oils are a bit confusing to most people. What your looking at, when you see 5w30, 10w30, etc, doesn't mean anything about temperature.
Here's an example - we'll use 5w30. Which is actually "5 winter 30". At cold temperatures the oil won't thicken up more than straight-5 weight oil, and when hot, the oil won;t thin out more than straight-30 weight oil. The same can be said for the other multi-viscosity oils just using the other numbers instead.
40 menas its thicker at operating temp than a 30. if you use a 40 weight in an engine that calls for a 30. you can ruin your engine as the thicker oil cant get to all the places in the engine that it should. so use what the car calls for.
اللى حيضيع بلدنا : الفهلوة و كلمة باشا و معلش و أصل
كل الكلام ده جميل
إنما كله على الcold start، يعنى بالنسبة ل5w ما فيش خلاف.
إنما بالنسبة للرقم العالى بتاع درجة حرارة الجو
الصورة التانية توضوح ان ال5w-30 اخره ٣٨° مئوية
يعنى يوم زى النهاردة الزيت ده حيفيص ومش حيستحمل
ال5w-40 حيستحمل وهما مش كاتبينه فى الدرجات الممنوعة
ال 30 و ال40 و ال50 مش درجات حرارة دى درجات اللزوجة
انا حمشي مع مواصفات برة مش بعترف بكتالوج اللى بيجلنا ! درجات الحرارة في بعض ولايات امريكا بتوصل 40 و 45 ذيينا !
موتور ال ecotec عايز لزوجة مخصوص ..
يا دوك طبعاً عارف ان دى مش درجات الحرارة وإنما درجة اللزوجة
حضرتك اللى مش واخد بالك
راجع الصورة اللى حضرتك عارضها
اللى فيها ثرموميتر وسهم بالطول جنبها
آخر الثرموميتر ٣٨°
owner's manual says to use 5W30, why would you use the 40 weight. The 40 means in hot temperatures the oil won't thin out more than 40 weight oil, so in hot weather, your car needs a lighter oil than 40. What happens if you use 40 instead of 30? For one thing your gas mileage in hotter weather will be worse because your engine will be working harder against that thicker oil and the thicker oil won't flow as easily around the engine so you will put more strain on your engine and possibly damage the internal parts.
حتى موبيل1 على موق بتاع "مصر" كاتبة 5w30
اللى حيضيع بلدنا : الفهلوة و كلمة باشا و معلش و أصل
العربيه بتاخد 4.5 كيلو ياجماعة الخير وبتبقى على المكاس يعنى لو عايز تحط 4 بس مفيش مشكله لكن لو حطيت 5 زى ما التتوكيل الخرفان بيقول حتضر الموتور لانه بيبقى فوق الماكس
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