Let's say you buy a new car/truck and it calls for 5w30 and you decide to run 10w30 summer and 0w30 in the winter. Now let's say your new ride has a connecting rod failure or some other big engine failure but not oil related. Can or will a car company not cover your repair if the oil is not a 5w30 in this case you were running a 10w30? Or if the oil is in the recommended 30 weight range you are ok?