My mom's '05 Honda Pilot 3.5L has recently developed a small oil leak. Within 4k miles, it developed an unusual "stuck lifter" type noise. Long story short, after taking it to the stealership, "an o-ring on the oil pump failed and is leaking oil onto the timing belt and tensioner." The previous owner used MS5K for <5k intervals. I have been doing 3-4k intervals using VML for about 20k now (currently ~125,000). It recently made a round trip from OKC to Las Vegas and back. My question is what would have caused this? Was it the VML (seal conditioners) or could it have been the long distance trip (heat)? Or perhaps just a random failure? I've never experienced a problem using VML so I highly doubt it was the oil (especially considering it is virtually spotless inside). What do you think?