Is the mobil 1 0w-20 full synthetic oil okay to use in a 1997 lexus lx450 . It has 180,000 miles on it . I have been watching some videos about the 0w-20 oil and it seems to clean out the gummyness around the piston rings and can help it from stop burning oil . Listen to what this guy is saying . If not long term maybe a few changes to help clean the engine out ? What do you mechanics think ? Thanks in advance .