For most of it's life it saw Pennzoil Ultra Platinum 5W-20 (changed every 4500 miles/6 months, and later Pennzoil Platinum High Mileage Full Synthetic 5W-30 changed every 4,000 miles/6 months).
Once my Pennzoil Platinum High Mileage stach dries up I'll be switching to SuperTech High Mileage Full Synthetic 5W-30 as it has a lot more phosphorous and zinc anti-wear additives and a lot more Calcium (derergent) additive. I've also done a total of 6 periodic engine flushes throughout the years which may have helped gradually keep the inside of the engine clean. I also changed the PCV valve every 30k miles.
I was thinking of switching to 5k mile/6 months OCI's.
My thinking is that the GM Dexos 1 Gen 3 oils have stricter limits for sludge and for the deposits which form varnish than regular API SP oils, and that 5k mile / 6month OCI in the J35A7 engines with VCM enabled would be safe with a GM Dexos 1 Gen 3 oil.
Just wanted to ask if you think it's safe to go to a 5k OCI on the Honda J35A7 engines with VCM enabled?
I also wanted to ask what was your typical OCI in terms of miles / months?
Also, did your van ever run while it was very low on oil which might have caused engine wear?
Just trying to understand the cause of the oil consumption.
I am the original owner. I never ran the engine low on oil. Always in the safe zone, usually adding .5-.75 qts. at a time.
I mostly followed the OLM and changed at 15%. Usually 4000-7000 miles. Mostly 4500 when oil life monitor hits 15%. (oil change every 4-5 ish months)
My van experienced all kinds of adventures, unfortunately many of them very short trips. 1 mile, to kids school, 1 mile to grocery store, 10 start-ups per day. Sometime no engine warm-ups in freezing temperatures. Some 1000 mile road trips as well.
It's been to H and back, kinda surprised myself it is doing as well as it is.
Never did an engine flush. At this point afraid of a flush due to dislodging and clogging something internal.
Oils used:
Mobil 1, 0w-20 AFE, 0w-20 EP, 5w-20, 0w-30 AFE, 5w-30 (Probably 50% of the changes where with Mobil 1)
Pennzoil Platinum 5w-30 (~ 5 changes)
Castrol 5w-20 Syn blend (1x)
Amsoil XL 5w-20 (1 or 2 times)
Amsoil Sig Series 0w-20 (1 or 2 times) (engine was the quietest and smoothest on this)
Redline 5w-20 (1x to try to clean up the insides) saw very minor cleaning, through fill hole
Napa Synthetic 5w-20
Valvoline SynPower 0w-20, 5w-30
The only thing that seems to temporarily reduce oil consumption is using Redline Fuel system cleaner as I think it helps clean up the piston ring pack from the top end. Mobil 1 0w-20 EP seemed to do well to loosen some internal deposits and hopefully clean up ring pack from the bottom end.
If you switch to longer change intervals I would peek in the oil fill hole with a flashlight every 500-1000 miles, if you see the slightest bit of varnish or deposits you are going too long with your oil change.
My internals of my `06 Odyssey are a mess and I am embarrassed. Combination of engine design and usage that made my mess, not lack of maintenance. I do have detailed records, but I would estimate I have changed the oil 50 times.