Today I found something like oil but white cream at the bottom of the driver shaft, is it wax?  and today is too hot, more than 36℃

It looks like body cavity sealing wax but you need to look above where it is draining down from to check for any sign of leakage.  From your picture it appears as if it is dripping down from above, but what is in that area?

4 hours ago, FelisBengalensis said:

It looks like body cavity sealing wax but you need to look above where it is draining down from to check for any sign of leakage.  From your picture it appears as if it is dripping down from above, but what is in that area?

both sides, near the steering linkages(left hand drive), the picture showed the right side. The left side has the same vertige but less serious, no white cream. Tonight when the engine cool down, I will take some pictures from above.