In order to use the oil seal reasonably, the following points should be paid attention to:
The temperature range of the mechanism in which the seal is installed must not exceed the temperature range of the seal elastomer.
Thoroughly clean the area around the oil seal and check how it is fitted. If you cannot see the outer end of the seal, remove the timing-belt cover or chain cover (not the belt or chain) and possibly the water pump (See Replacing a water pump ) to reveal it. On an engine with a belt-driven overhead camshaft , remove the belt and its drive sprocket .