Rear Main Seal Replacement
Expert rear main seal replacement to resolve serious oil leaks between your engine and transmission. We provide precision installation to protect your driveway and engine health. By appointment only for dedicated expert attention to your vehicle. Call now to schedule your service.
The rear main seal (RMS) is a critical yet often overlooked component that prevents engine oil from leaking where the crankshaft exits the engine block, interfacing with the transmission. At Apex Automotive in Gilbert, AZ, David Jr. and David Sr. understand that a failing rear main seal can lead to serious oil leaks, engine damage, and costly repairs if left untreated—especially in Arizona’s extreme heat, which accelerates seal wear and oil degradation.
The rear main seal is a precision-engineered rubber and metal assembly designed to withstand constant crankshaft rotation and high temperatures. Over time, heat cycles, oil contamination, and engine vibration cause the seal to harden, crack, or lose its elasticity, resulting in oil seepage or heavy leaks. Symptoms include visible oil spots under the vehicle, burning oil smell, or low oil levels triggering the check engine light.
In the East Valley’s desert climate, elevated under-hood temperatures intensify rubber degradation. Additionally, off-road dust and debris can further stress the seal’s integrity. Failure to address a leaking rear main seal promptly risks oil starvation and internal engine damage.
David Jr.’s diagnostic-first approach starts with a detailed consultation and visual inspection, combined with OBD-II scanning to rule out related engine faults. We use leak detection methods and carefully assess the oil leak’s origin to confirm the RMS as the culprit—not just a gasket or valve cover leak.
Replacing the rear main seal requires expert disassembly, often involving transmission removal to access the seal housing. Apex Automotive’s decades of combined experience and machine shop connections ensure precise installation with correct torque specs and clean mating surfaces to prevent future leaks. We use high-quality OEM or aftermarket seals rated for Arizona’s heat and harsh conditions.
Because this repair is labor-intensive, we perform rear main seal replacements by appointment only, guaranteeing personalized service and thorough final testing. After installation, we monitor engine oil pressure and check for leaks to confirm a successful repair. Trust Apex Automotive to protect your engine’s health and your driveway from oil stains with our expert rear main seal replacement.