Silicone sealant has long been used in engine repairs—but in the world of precision-built remanufactured Jaguar and Land Rover engines, not all sealants are created equal. In fact, misusing silicone can lead to major engine damage, oil starvation, or leaks.
But that doesn’t mean silicone should never be used. When applied according to factory specifications—and only in the right places—it can be a crucial part of engine sealing.
In this blog, we’ll break down:
When applied incorrectly—or in excess—silicone can harden and break loose, entering the oil system. Once it circulates through your engine, it can block narrow oil passages or get trapped in filters.
Silicone doesn’t need to be slathered on. Unfortunately, many DIY builders or mass-production remanufacturers use far too much. This causes:
Off-the-shelf silicone isn’t made for modern aluminum engine blocks or synthetic oils. Cheap products lack the chemical resistance and thermal stability needed for Jaguar and Land Rover’s 3.0L and 5.0L supercharged engines.
Jaguar Land Rover does call for RTV silicone in specific places during engine assembly. These are strategically chosen areas where no gasket is used and where thermal expansion, oil sealing, and vibration isolation are critical.
These locations require OEM-approved RTV silicone, applied in precise bead widths to clean, machined surfaces—not smeared on like caulk.
At Rover Parts Depo, we don’t cut corners—we follow JLR factory sealing specs to the letter.
We apply RTV silicone only in designated sealing areas, exactly where Jaguar Land Rover requires it. This ensures maximum durability and leak-free performance—without risking oil flow or gasket failure.
We don’t rely on silicone alone. Instead, our sealing process includes:
This hybrid system gives you a factory-grade seal without the risks of overuse or shortcut methods.
A poorly sealed engine leads to:
Your Jaguar or Land Rover deserves better—especially when investing in a remanufactured build.
All images are original and documented by Rover Parts Depo during actual teardown of JLR 5.0L engines—showcasing the real-world consequences of RTV misuse.
Silicone isn’t the problem. Improper silicone use is.
At Rover Parts Depo, we combine experience, precision, and manufacturer compliance to ensure every Jaguar or Land Rover engine is sealed exactly the way it should be—no more, no less.
If you want your engine to run like new, don’t trust shops that misuse sealant. Trust the team that builds it the right way, every time.
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