Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

What does it mean to find oil in the coolant reservoir?

Model: (Various brands) Various
Part: Antifreeze coolant

Video tutorial

In this video, we observe the symptom of a broken heat exchanger. This issue occurs especially in more recent diesel vehicles.

If this component fails, a type of emulsion formed by oil, brown in colour, will be found in the radiator expansion tank. As a primary consequence, the head gasket becomes burnt.

In these cases, oil and coolant mix, which in a properly functioning system should flow through two separate and sealed circuits. One reason for the exchanger's failure is the use of water instead of coolant.

Water causes oxidation of the plates, leading to the mixing of the two fluids that should always remain separate.


Updated on 26 August 2026 by ScegliAuto


Related tutorials

What Does It Mean If We Need to Top Up the Coolant in Our Car
What Does It Mean If We Need to Top Up the Coolant in Our Car
(Various brands) Various This video explains what it means if we need to periodically add coolant to the designated reservoir in our car. The cooling system is a closed circu…
The reasons why we should never fill the coolant reservoir beyond the "max" limit.
The reasons why we should never fill the coolant reservoir beyond the "max" limit.
(Various brands) Various When we fill the coolant tank of our car, we should NEVER fill it beyond the maximum level indicated on the tank. This is very important because as t…
Coolant Replacement
Coolant Replacement
(Various brands) Various Open the bonnet and prop it up with the support rod. Place a collection tray under the engine bay. Once you locate the coolant pipe, check if it has …

How to Remove the Toll Tag Holder from the Car Windscreen

The toll tag holder is usually attached to the car windscreen to ensure that the toll tag functions immediately when passing through barriers. However, if you decide to remove the holder, you should follow this procedure: - Insert the toll tag into the holder; - Pull the holder inwards to detach it from the windscreen; you can use a glass scraper or a stiff plastic card to assist you; After removing the holder, it is essential to remove the adhesive from the windscreen. To remove the adhesive, we recommend using a solvent-based spray that will remove the glue without clouding the area.

Watch the video!


by ScegliAuto

More videos