Be sure to change your PCV valve at every-other oil change if on the 3500 mile cycle. Also check your coolant to see if perhaps you've got a head gasket problem. Look under the VX after parking for while to check for leaks, especially around the rear of the engine and beneath the drain plug. The drain plug uses a copper washer as a seal which can be re-used for some time if cared for, but more often than not it gets damaged or over-torqued and can be a source of leakage. If leaking it can be replaced with an inexpensive poly washer from AutoZone or the like, or you could go with the excellent Fumoto valve which eliminates the whole drain plug issue altogether.

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