Hi, I bought the wife a new '06 Tribeca Limited a couple of months ago and did the first oil change today. I used the regular oil the the dealer recommends this time in order to be sure the rings seal properly. I plan on switching to Mobile 1 10/30 from now on. I've had great luck with synthetics in the past and am just wondering I've anyone has heard of any downs sides to using it in a Subaru. I will be in big trouble with the wife if I were to bring any harm to her new baby.