Top 10 Things That Will Go Wrong With A 100k + Mini Cooper S R53 W11 Engine

Summary

In this video, the creator outlines the top 10 things that can fail or require attention after 100k miles on a Mini Cooper S with the W11 engine. These include issues like crankshaft pulley oil leaks, supercharger oil maintenance, and gasket failures. The creator stresses the importance of proactive repairs to maintain reliability, such as replacing the valve cover gasket, oil cooler seals, and addressing corrosion on the body and suspension components. The video also highlights supercharger issues, bypass valve problems, and potential head gasket failure, offering valuable insight for Mini Cooper owners looking to preserve their cars' performance.

Takeaways

• 😀 Crankshaft pulley and oil seal leaks typically start at around 50k miles but need to be fixed by 100k miles to avoid oil leakage and damage to the engine belts.
• 😀 Supercharger oil should be regularly changed, as it tends to run low over time. BMW does not recommend it, but it's essential for the supercharger's performance.
• 😀 It's recommended to replace the valve cover gasket even if it’s not leaking, as a precaution to prevent future issues.
• 😀 Oil filter housing gasket and seals are prone to leaking and need to be replaced with revised versions from BMW to prevent oil loss.
• 😀 Sump pan gaskets under the engine can leak, but replacing them is relatively simple due to the compact engine design.
• 😀 The Mini Cooper S is prone to body corrosion, especially under the car. Stainless steel exhausts are a common fix for exhaust system rust.
• 😀 Suspension arms, joints, and bushings often corrode over time, requiring replacement for safety and performance.
• 😀 Thermostat failure can occur after 100k miles, and replacing it is necessary to avoid overheating problems.
• 😀 Supercharger failure is indicated by a grinding noise and may be caused by low oil. Replacing the supercharger costs around 400 pounds.
• 😀 The bypass valve may stick, affecting engine performance and causing lack of boost, so it should be replaced when necessary.

Q & A

What is one of the first issues that can arise on a W11 engine after 100k miles?

The crankshaft pulley is one of the first components to cause issues after 100k miles, often accompanied by oil leaks from the seal. It's crucial to address it early to prevent further damage to the belt and pulley system.

Why is it important to change the supercharger oil on a Mini with the W11 engine?

The supercharger oil needs to be changed regularly, as many BMW dealerships do not recommend it. If left unchecked, the oil can run low, which could lead to supercharger failure and other engine issues.

What should you do with the valve cover gasket after reaching 100k miles on a W11 engine?

It is recommended to replace the valve cover gasket even if it's not leaking. Preventative maintenance is important to avoid future issues, as worn gaskets can cause oil leaks.

What is the role of the oil cooler housing gasket, and why does it need replacing?

The oil cooler housing gasket and seals are prone to leaks, especially before reaching 100k miles. Replacing them ensures proper oil containment and prevents messy leaks that can damage other parts of the engine.

How difficult is it to replace the sump pan gasket on the W11 engine?

Replacing the sump pan gasket is relatively easy compared to other BMW engines. It's located at the bottom of the engine, and the replacement is straightforward if the gasket is leaking.

Why do many Mini owners replace the exhaust system with stainless steel?

Mini exhausts are known to corrode over time, so many owners opt for stainless steel replacements to prevent rusting and improve the longevity of the exhaust system.

What should you check for when inspecting the suspension arms on a Mini with the W11 engine?

The suspension arms, especially their joints and bushes, can corrode over time. It’s important to inspect them carefully and replace them if signs of corrosion or wear are visible.

What causes thermostat failure on a W11 engine and how should it be addressed?

The thermostat may fail due to cracks or excessive heat. It's crucial to replace the thermostat housing and the thermostat itself if overheating or issues with cooling are detected.

How can a failing supercharger affect the performance of a Mini with the W11 engine?

A failing supercharger can result in a grinding noise, and if not addressed, it could cause a loss of boost and engine performance. It's advisable to check and replace the supercharger oil regularly to avoid this issue.

Why is it not recommended to remap or tune the Mini's W11 engine without upgrading internal components?

The internal components of the W11 engine are not designed to handle excessive boost or pressure. Remapping the engine without upgrading the internals can lead to head gasket failure and long-term engine damage.