Is it normal that when I start my 08 ES 350 the engine seems to sound very clanky or almost like a diesel engine for lack of a better way to describe it. Well, maybe not as load as a diesel engine but very different from what I think it should sound. This seems to smooth out after a few minutes. I've noticed this since the weather has gotten colder (I live in Dallas). When I took it to the dealer, they say this is normal and there is nothing wrong. A service advisor says it probably sounds this way because the oil hasn't had time to go throughout the system. They say they compared my car to another vehicle and didn't hear any difference. Are they feeding me a boatload of crap? I like everything about the car with this one exception.