我的99年sienna曾經有過sludge，是因為有一次隔了一年才換油，後來改用合成油，加上勤換。sludge就沒了。

所有跟帖： 

• here you go -隱睾- ♂ (0 bytes) () 11/05/2014 postreply 13:00:12

• BTW, the oil is mobil 1 high mileage synthetic, a damn fine oil! -yanif- ♂ (0 bytes) () 11/05/2014 postreply 13:19:09

• it is agressive to seals -隱睾- ♂ (0 bytes) () 11/05/2014 postreply 13:25:24

• what seal? head gasket? -yanif- ♂ (0 bytes) () 11/05/2014 postreply 13:27:55

• may be others -隱睾- ♂ (0 bytes) () 11/05/2014 postreply 13:47:19

• main, oilpan, shafts, valve covers -隱睾- ♂ (0 bytes) () 11/05/2014 postreply 14:23:05

• valve stems -隱睾- ♂ (0 bytes) () 11/05/2014 postreply 14:26:19

• piston seals. -燕京十景- ♀ (0 bytes) () 11/05/2014 postreply 14:19:12

• are metallic -隱睾- ♂ (0 bytes) () 11/05/2014 postreply 14:22:08