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1709
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1886
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161
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1510
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1317
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2533
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1031
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2480
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2899
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439
The sealing lip of the RST-D is more heavy-duty, so it can cope with pressures of up to 10 bar at slightly lower rotation speeds.
Place the ruler or straight-edge on edge diagonally across the head and block and look for gaps showing light anywhere between the ruler and block.
What are Oil Seals?

valve cover gasket assembly. The valve cover gasket assembly seals off the engine and prevents any unwanted contaminants from entering, thus ensuring the engine remains clean and well-maintained.