MLT Engineering Valve Covers Oil Baffle Kit
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The MLT baffle kit is an aftermarket internal baffle insert/upgrade designed to be used with aftermarket billet/aluminum valve covers (or valve cover set-ups) on the S65 engine.
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When used properly, it helps manage crankcase ventilation and oil-mist/oil-vapor separation — reducing oil carry-over through the PCV/breather system and helping prevent oil in the intake or excessive oil mist (common issues under spirited driving or higher RPM). This results in a cleaner engine bay and more stable oil control, especially useful for a high-revving engine like the S65.
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MLT bundles the baffle kit with their billet aluminum valve covers. Their valve covers are fully CNC machined from solid aluminum, to avoid the common problems associated with the OEM magnesium covers for S65 (porosity, cracking, sealing issues over time).
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In effect, MLT’s kit is part of a “premium valve-cover + oil-control upgrade” for the S65 — not simply a replacement part for OEM covers.
Why Aftermarket Covers + Baffle Kit Are Common for S65 (OEM Cover Problems)
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The stock S65 valve covers are made of a magnesium alloy. Over time (heat cycles, age, etc.) those covers tend to develop microporosity, oxidation/corrosion, and eventual leakage or gasket sealing problems — especially along the gasket rail.
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As a result, many S65 owners replace the stock covers altogether with billet or aluminum covers — then use a baffle kit (like MLT’s) to get reliable crankcase ventilation and oil-mist control.
Conclusion — What MLT’s Kit Means vs OEM Reality
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MLT’s baffle kit + billet covers represent an upgrade path for S65 owners who want reliability, better crankcase ventilation/oil-mist control, and to avoid the known issues of OEM magnesium covers.
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There is no documented OEM part that corresponds to a “standalone S65 oil-baffle kit” — so if you want the benefits of baffling or better internal oil control, you either need to use aftermarket covers (plus a baffle) or rely on OEM valve-cover + full gasket / oil-separator maintenance (which historically has been less reliable for high-stress use).
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If your goal is reliability and long-term leak-free performance — especially under high RPM / spirited driving — the MLT (or similar aftermarket) route is often viewed as a “proper fix” by the community, rather than just replacing the OEM gaskets over and over.