Im sure you've noticed the sudden popularity of motor oils made especially for high mileage cars. I know it's been advised to stay away from full synthetics on high mileage engines cause of the risk of developing leaks. So I just use dino oil from valvoline called max life. The engines got 130,000 on the clock. Would it be ok to try a synthetic blend without causeing any leaks? Mobil 1 has this new oil thats fully synthetic made for high mileage cars.