Originally Posted By: gfh77665
Originally Posted By: gathermewool
Sounds like a waste of time. Run the Oddysey's maintenance minder to its full interval.
I hear ya. I definitely would, if I was using synthetics. I just don't want to go almost 10K on conventionals. even though the Honda is almost 100% highway useage. By doing 5K changes, I replace the quality filter (NAPA Gold, etc.) every other change, at 10K.
What does the owner's manual require for oil? My '08 Civic's MM assumes mineral and will typically prompt me to change the oil at around 7k+ miles. I'm also on my third interval for the Fram Ultra filter (~21k miles total when I change the oil next). For this particular filter, I would consider a 10k miles interval to be a waste of time and money.
Even if your MM is calibrated for synthetic oil, I'd still run it out to 10k, if that's what your MM OCI is, since most of your miles are highway.
Either way, if you don't consider the oil used up for the purposes of using it in one vehicle (the Marquis), it shouldn't be considered used up for any vehicle (including the Honda). The oil is either good to go or used up.
The exception MIGHT be wanting the best oil in a heavy-duty vehicle, and then putting it's used oil in a very light-duty vehicle, where a sheared down viscosity and somewhat depleted additive package means something to the heavy-duty vehicle, but won't for the transplant vehicle.