Can you switch from 10w30 to 10w40 oil?

I was told to replace my brake pads because they were contaminated with brake fluid seems sensible but I'm leary the mechanic is just taking advantage of me any advice? What is the correct firing order 1968 455? How do you change antifreeze coolant in Nissan Maxima? What is the average gas turbine exhaust temperature? Where can you get owners manual for sears battery charger 200.713101? 1987 Acura integra Fuse box cover missing What fuse is for what? What is the firing order for a isuzu 6BG1 engine? Why does my car sputter after I changed the oxygen sensors? How do you remove an alternator bracket on a 1998 Dodge Caravan 3.3 Liter engine? What are different about car and flashlight batteries? How can you clean used motor oil? Do turbos overheat on a gas powered vehicle or supercharger? Why would white smoke come out of my tailpipe after changing the valve cover gasket on my 95 Nissan 200sx it only does it on highways and has also started missing never had these problems b4? Is the study of the effect on lighting on work productivity the workers were told that the lights would be changed monday and researchers would measure the? How soon will the engine stop if you put diesel in a petrol engine? What is the firing order on 1995 Pontiac Grand Prix 3.4 liter V6 dohc 24 valve? Why does gears grind when trying to shift in gear with clutch pedal engaged? How do you know when a timing chain goes out? What does bio mean in biofuels? What is the name of the circuit has current flowing in a loop from the negative battery terminal in the positive battery terminal?