[Kracka]

I actually prefer the Syntec to the Mobil 1, it provides a bit better engine protection and doesn't run on the thin side like M1 does. The M1 will last a bit longer though. You can easily go 8k miles with the M1, no need to change the filter between drains since you are using a quality one. You could even bring the interval to 10k if you wanted. Just be sure to change it in one year no matter how many miles are on the oil (6 months for conventional oil).

Keep in mind that synthetics provide no where near the benefits that they used to, quality conventionals are right up there in terms of protection, they just need to be changed out more frequently (4-5k miles is fine unless you are really beating on the car). Quality oil filters are very important though; for a DSM, its pretty tough to beat a Mitsu filter.