I have an '02 WRX with 105k miles on it. The previous owner just used dino oil - I don't know what brand or anything. I bought the car with 99k miles on it. Since then, I put 3k miles on whatever dino juice the previous owner put in it before the sale, then I put 3k miles on 5w30 Mobil 1 Clean 7500 synthetic blend.
I want to make the switch to Mobil 1 full synthetic because I want the car well protected - it is my daily driver and I also autox in it. My question is that is my mileage too high to switch to the full synthetic? I know switching to synthetics at high mileage is sometimes a bad idea because leaks and consumption become more pronounced, but in the last two oil change intervals I have had no noticeable consumption on either dino or synthetic blend oil. Do you think it is safe to switch, and is the added protection worth the risk/cost?