The rear main seal keeps oil sealed inside the rear of the engine, where the crankshaft ... Rear main seals can be made of rubber or silicone, and they can wear out because of age, the rotational ...

SUNRISE, Fla., March 31, 2025 /PRNewswire/ -- The Flex Seal Family of Products is excited to announce the expansion of its innovative Flex Caulk line to include a 100% silicone offering.