S60 T5 (MY2005), the car is great and everything is fine, except intermediate block leaked...

I tired to clean my floor everyday and thus I just done my general overhaul in last 2 months and adjusting the timing belt about 1 month ago.

I loss crazy volume of engine after adjust the timing belt....

1) 2 days trip 800km - loss of engine oil about 1 liter;
2) 3 weeks and drove 270km - loss of engine oil about 1 liter
3) today top up till MAX and drove about 30km, it loss about 100ml...

I am going crazy soon.... no white smoke from tail pipe... no oil on my floor... i have no cues where are the oil gone?

I checked with my mechanic who overhaul my engine and he shown innocent to me .... he is not Volvo specialist... He said maybe piston or turbo problem, but he did not open the piston section at all during oeverhaul.

Is anyone who has similar experience could give me advice about what to check.... I cannot afford the $$$ and energy to check and top up the engine oil like petrol

Pls help Pls help