50mm F4R Core Plug - Renault Clio RS & Megane RS

What happens if you don't replace your F4R engine core plugs?

Ignoring the condition of your expansion plugs during an engine rebuild or major maintenance is a costly gamble. Over time, heat cycles and vibrations cause original plugs to lose their sealing integrity. A failure here leads to a massive oil leak, which can result in immediate engine seizure or a fire hazard under the hood. Do not let a low-cost component sideline your performance vehicle.

Exact Fit and Technical Precision

This 50mm diameter plug has been specifically selected by Optimiz Access for Renault Sport F4R blocks. Whether you are building a rally car or maintaining your daily driver, this part meets the rigorous demands of both OEM and competition standards.

Compatible Vehicles:

• Renault Clio 2 RS (172, 182, Jean Ragnotti)
• Renault Clio 2 Gr N / X65 Cup
• Renault Clio 3 RS (Phase 1, Phase 2, World Series)
• Renault Clio R3 / Clio 3 X85 Cup
• Renault Megane 2 RS (225, 230, R26, R26.R)
• Renault Megane 3 RS (250, 265, 275, Trophy-R)

Optimiz Access Expertise for Your Engine

Since 2010, Optimiz Access has supported enthusiasts in vehicle personalization and performance. We know that quality parts are the foundation of reliability. This core plug guarantees optimal resistance to internal pressure, even during intense temperature spikes on track days.

Installation and Local Services

Based in Hauts-de-France (near Lille, Cambrai, and Arras), our technicians can handle the installation of your parts and complete maintenance for your sports car in our workshop. We also ship worldwide with fast delivery to ensure your project never grinds to a halt.

Note: To complete your build, please check the complementary products at the bottom of this page, including our high-performance cooling solutions.