ما هو زيت المحرك الأكثر سمكا? – 2025 أحدث دليل

كصاحب سيارة, I’ve often wondered, “What’s the thickest engine oil I can use safely in my vehicle?" Maybe you’re like me—trying to find the best oil for extreme heat, سحب الأحمال الثقيلة, or dealing with an older engine that’s burning oil faster than it should.

في هذه المقالة, I’ll take you through everything I’ve learned about thick engine oils, their applications, and when (or when not) to use them. Whether you’re trying to boost oil pressure, reduce oil leaks, or improve engine protection in severe conditions, this guide covers it all.

Understanding Oil Viscosity: ماذا يفعل “سميك” يقصد?

The “thickness” of engine oil is measured by اللزوجة—its resistance to flow. أ higher number means a thicker oil.

على سبيل المثال:

لذا, if we ask what is the thickest engine oil?, we’re looking for the highest viscosity rating, particularly the second number in multigrade oils.

ما هو زيت المحرك الأكثر سمكا?

The thickest commonly available engine oil is:

ساي 60 or SAE 70

• هذه هي monograde oils, used in racing engines or vintage engines.

• ساي 70 يكون extremely thick—like molasses when cold.

• Not recommended for most modern engines.

Thickest Multigrade Oils:

Among these, 25W-60 و 20دبليو-50 are widely used and available for commercial automotive use.

When Should You Use Thick Engine Oil?

Not all engines need or benefit from thicker oil. But in some situations, thick oil is exactly what your engine needs.

✅ Use thicker oil when:

• Your engine is old and burns oil

• تريد higher oil pressure

• You’re in a very hot climate

• You tow heavy loads or do hard driving

• You drive a classic car or diesel truck that calls for it

❌ Avoid thicker oil if:

• Your car is newer and under warranty

• أنت تعيش في cold climate

• Your engine is designed for low-viscosity oils (على سبيل المثال, 0W-20 or 5W-30)

• تريد كفاءة الوقود

Pros and Cons of Using Thick Engine Oil

Can Using Thick Oil Damage My Engine?

نعم, if it’s too thick for your engine’s tolerances. Oil that’s too viscous can:

• سبب sluggish cold starts

• Starve internal parts of lubrication

• Overwork the oil pump

• Void manufacturer warranties

تحقق دائمًا من دليل المالك الخاص بك for recommended oil grades. Manufacturers design engines with specific oil flow requirements in mind.

Should I Switch to Thicker Oil if My Car Burns Oil?

كثير من الناس (نفسي بما في ذلك) have tried using 20W-50 or high-mileage formulas to reduce oil burning in older engines. It often helps. But remember:

• هذا هو a temporary fix, not a repair.

• Thick oil may mask a deeper issue like bad valve seals or worn piston rings.

• Use it as a last resort or to extend the life of a beater car.

التعليمات: Thickest Engine Oil

س: What is the thickest motor oil I can buy?
أ: ساي 70 is the thickest, but for regular use, 25W-60 أو 20دبليو-50 are the thickest practical multigrade options.

س: Is 20W-50 oil thicker than 10W-40?
أ: نعم. Both in cold and hot conditions, 20W-50 is thicker.

س: Can I use thicker oil in summer?
أ: نعم. In high temperatures, thicker oil can help maintain pressure and reduce wear.

س: Will thicker oil stop engine knocking?
أ: It may reduce it slightly in high-mileage engines, but it’s not a true fix for knocking, which is often mechanical or ignition-related.

س: Is thicker oil better for high-mileage engines?
أ: يمكن أن يكون. Many high-mileage oils are formulated slightly thicker to reduce leaks and oil burn.

س: Can I mix thick and thin oils?
أ: أنت يستطيع, ولكن لا ينصح به. Stick to one proper grade. Mixing alters viscosity unpredictably.

الأفكار النهائية

If you’re dealing with an aging engine, extreme weather, or heavy loads, a thicker oil like 20دبليو-50 أو حتى 25W-60 might be your engine’s best friend. But for most modern engines, sticking with the manufacturer’s recommended grade is always the safest move.