This was a great reference, I got my 2008 Ridgeline with 14,000 miles recently, there was no indication on the history that fluids were replaced other than the oil. Since I have no indication on what driving conditions it was operated in over the last few years and the dealer has agreed to replace the fluids VTM 4 do you think I should have the ATF-z1 and haploid gear oil replaced at the same time if the dealer will cover the cost? No sense waisting resources, only drive 5000 miles per year.
Thanks for your input, Maintence Minder says 70% on oil, and I've bought enough Mobil One for 3 Oil Changes, should I convert after 3000 miles from the last Oil Change?
Well rats. I just had a computer crash after typing a lengthy response.
Long story short, if you can't get the service records for your RL, I would assume that you're on your 3rd oil change with 70% remaining at 14k miles. The mx schedule calls for VTM-4 service at 15k miles. However, it's been my experience that you will get the -6 callout for VTM-4 service when you're due the 2nd oil change.
IE, you should see an A1 callout at 5-8k. And a B6 callout at 10-15k. Much depends on the driving environment the RL sees (road or city, hot, rapid starts, etc.) And as usual, YMMV.
Without service records, I'd go ahead with the VTM-4 fluid change by 15k and leave the MM alone and watch for the next callout for the -6 service. You might eyeball the rear diff drain and see if the white paint marks line up. If not, it's a good bet the rear diff (VTM-4) has been serviced. But still.....
Per the schedule (normal service), the first tranny service (with accompanying transfer assembly fluid change) happens at 45k miles. I serviced my tranny at 17k miles and am glad I did due to a significant amount of debris on my mag plug. I'll likely do another tranny drain and refill at the 30k mark.
Use your own judgment on the tranny service at 14k. It's way early (as was mine). Also I wouldn't worry with the transfer assembly (hypoid gear oil) for a good while yet... maybe at the 30k point or at least by the 45k point.
On the oil change to Mobil 1, personally I'd wait until the MM calls for your next oil change.
Edit: or as hondaloyal correctly points out below, at 12 months from your last oil change if the MM hasn't called for it.
See the note at *1: