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Remove oil filter.
Pry circlip (17) out with a screwdriver.
Remove valve seat (12), valve cone (14) and compression spring (15).
Install valve seat (12) with extended guide with valve cone (14) and compression spring (15) (2nd version).
NOTE: Standard set oil return check valve with improved sealing properties as of engine no.:
119.970 12 029 923
119.971 12 015 069
119.972 12 002 097
119.974 12 006 973
119.975 12 007 964
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