Merely saying that long idling to warm up the engine is a useless habit that majority of pinoys do. I really don't know why it had to come up again. We all know that the engine will warm up eventually & be more fuel efficient when driven slowly in the first few minutes. You did mention that you do part of your routine, no matter how infrequent it may be. If you don't do it, then you would not have mentioned it. Merely mentioned also that leaks are first detected on the garage floor. Peace amigo.