Oil Change = Engine Failure ???

Rick3000, what did you really expect your mechanic to tell you? Business is slow. He's just trying to make a living.

[cnavarro]

We've done the used oil analysis and 7500 mi is pretty much tops for a drain interval for street driving. By 10,000 mi, the oil was crap quite a few miles before that point. 5000 mi is honestly a very good point to change the oil. Sooner may be overkill, but certainly can't hurt. Take it from someone who has seen many intermediate shafts with long drain intervals and the kind of crap that fills the IMS tube (and not to mention what the bearing looks like) once the seal stops sealing (happens pretty quick once there is even the slightest play in the bearing).

[spine911]

Originally Posted by cnavarro

We've done the used oil analysis and 7500 mi is pretty much tops for a drain interval for street driving. By 10,000 mi, the oil was crap quite a few miles before that point. 5000 mi is honestly a very good point to change the oil. Sooner may be overkill, but certainly can't hurt. Take it from someone who has seen many intermediate shafts with long drain intervals and the kind of crap that fills the IMS tube (and not to mention what the bearing looks like) once the seal stops sealing (happens pretty quick once there is even the slightest play in the bearing).

Personally, i'd take this guy's opinion. An oil analysis is the best objective way to scientifically measure the oil's performance. I also go with 7500k oil change intervals just to be safe.