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What Causes Engine Oil Emulsification, Forming the So-Called "Mayonnaise"?

Model: (Various brands) Various
Part: Engine oil

Video tutorial

In this video, we can see what causes the oil in our vehicle to emulsify, forming the so-called "mayonnaise", a slimy whitish emulsion that, from its appearance, promises nothing good. The first reason for its formation is a blown head gasket, allowing coolant to mix with the oil, resulting in this unpleasant outcome; consequently, the coolant reservoir level drops, and you may find a similar emulsion there as well.

The second reason is incorrect oil viscosity or using semi-synthetic (or mineral) oil instead of synthetic oil. If the oil has incorrect technical specifications, it creates excessive condensation, which, with engine movement, results in this sludge.

The third reason is infrequent use of the vehicle: if you use the vehicle little and for short distances, this condensation will form even if the gasket and oil are perfect, causing the same problem and increasing the oil level.

Remember, in any case, this emulsion is a warning of a very serious issue.


Updated on 2 September 2026 by ScegliAuto


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How to Remove the Rear Seat of a Hyundai Tucson?

To remove the rear seat of a Hyundai Tucson, follow these steps. Start by moving the front seats to their most forward position to gain space. Next, locate the release lever on the underside of the rear seat, near the floor. Press this lever down while pulling the seat upwards to unlock it from the anchor pins. Once unlocked, tilt the seat upwards and forwards to remove it from its position. Repeat this process for both sides of the rear seat. Be careful of any electrical cables or components that may be connected to the seat during removal. Once the rear seat is removed, the disassembly is complete.

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by ScegliAuto

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