K24 and 10k OCIs

[cammyfive79]

I’m doing a few relatively short OCIs of VRP on my low mileage TSX with the K24 and 5 speed auto but am thinking down the road to hopefully doing 10k intervals. I don’t drive the car hard really and it’s my daily driver that will see 75-80% highway miles and trips of at least 8 miles to work 4 days a week and pleasure driving on weekends of longer distances. Naturally aspirated with no direct injection and used in a zillion cars over the decade or more it was in production, I assume 10k with a stout oil (HPL, PUP, etc) would be no problem but since I assume more than a few members here have this engine in use, I wanted to ask.

When doing an obligatory search it seemed that much higher mileage cars burn a bit, but that’s definitely not the case for me.

 

[cammyfive79]

I should add that I’m running 5W30 with VRP so I’ll continue that with whatever I choose next.

 

[MalibuRam65]

Will going 10k oci keep the piston rings clean ?

 

[The Critic]

It's a great way to turn your engine into an oil burner. The K24's tend to burn significant amounts of oil when they get older and the ones that see long OCI's are almost always the worst offenders.

 

[Sequoiasoon]

I would say if you use an HPL version that 10k should be doable while keeping the rings clear. Of course you would want to do a couple UOA’s to confirm use in your motor.

My daughters ’08 CRV 2.4L does not burn any at 5k intervals currently. For the first 210k it had mostly dealer oil changes with whatever bulk oil and filter.

I did a BG EPR just because a couple years ago. I did 2 rounds of EC30 with 4-5k OCI that got some carbon junk out. Now on second OCI using 1 qt of HPL PCMO 5W-30 with other 5W-30 versions. Pictures posted in EC30 thread. Also showing low flow baffle plate area getting cleaned slowly. I presume the ring areas with more active oil movement are better.

Now the questions are WHY do you want to go to 10k intervals? Two 5 qt jugs of VRP is still less than 5 qts of HPL base PCMO. So you would save the cost of one filter if you change at 5k vs 10k. If it’s a time and hassle thing that’s another story. If your racking 50k plus per year on it and includes downtime maybe. Environmental reasons not using more?

For me I’m sticking with ~5k intervals on hers with 1 qt of HPL PCMO in place of whatever I’m using.

Contrast to CRV, my ’17 Accord 2.4L with 114k does burn oil, about 1-1.5 qts every 5k and has since I got it with 49k. Maybe previous owner did damage early? Probably more from hitting higher RPM’s often. Looks shiny silver through oil fill and my oil stays clean for a while each OCI so doubt it. PCV has been changed and will be again shortly. Going longer toward MM for me on that just means more added to top off so I’d rather just change it. My cars are 1-2 OC per year except the Accord maybe getting a 3rd one. YMMV

 

[cammyfive79]

It's a great way to turn your engine into an oil burner. The K24's tend to burn significant amounts of oil when they get older and the ones that see long OCI's are almost always the worst offenders.

Thank you. This is the answer I was looking for based upon user experience with this specific engine.

 

[cammyfive79]

I would say if you use an HPL version that 10k should be doable while keeping the rings clear. Of course you would want to do a couple UOA’s to confirm use in your motor.

My daughters ’08 CRV 2.4L does not burn any at 5k intervals currently. For the first 210k it had mostly dealer oil changes with whatever bulk oil and filter.

I did a BG EPR just because a couple years ago. I did 2 rounds of EC30 with 4-5k OCI that got some carbon junk out. Now on second OCI using 1 qt of HPL PCMO 5W-30 with other 5W-30 versions. Pictures posted in EC30 thread. Also showing low flow baffle plate area getting cleaned slowly. I presume the ring areas with more active oil movement are better.

Now the questions are WHY do you want to go to 10k intervals? Two 5 qt jugs of VRP is still less than 5 qts of HPL base PCMO. So you would save the cost of one filter if you change at 5k vs 10k. If it’s a time and hassle thing that’s another story. If your racking 50k plus per year on it and includes downtime maybe. Environmental reasons not using more?

For me I’m sticking with ~5k intervals on hers with 1 qt of HPL PCMO in place of whatever I’m using.

Contrast to CRV, my ’17 Accord 2.4L with 114k does burn oil, about 1-1.5 qts every 5k and has since I got it with 49k. Maybe previous owner did damage early? Probably more from hitting higher RPM’s often. Looks shiny silver through oil fill and my oil stays clean for a while each OCI so doubt it. PCV has been changed and will be again shortly. Going longer toward MM for me on that just means more added to top off so I’d rather just change it. My cars are 1-2 OC per year except the Accord maybe getting a 3rd one. YMMV

Thank you, I appreciate the specific answer. I have no real desire one way or another, just curious if it was feasible I would do it, if not as seems to be the case I’ll stick with shorter 5k intervals.

 

[Sequoiasoon]

So 8 miles to work and then home = 16 miles. If you start to work 5 days = 80 miles per week. If you work 52 weeks = 4160 miles in 1 year. Do a bunch of pleasure drives and double that = 8320 miles per year.

You want to go 10k changes why?

 

[zfasts03]

Also, the longevity of the timing chain components is related to clean oil.

I guess it depends if you are looking to get 200,000 miles out of it or 400,000+ miles.

 

[CharBaby]

IMHO, 10K mile OCIs are not good for an engine all the time(every OCI).
An occasional 10K may not hurt but not all the time if you want you engine to last.
8 miles to work and 8 miles back are not enough to heat soak the engine. And just because you travel on the hiwy for the weekends, that only helps for a tiny for the fuel dilution that you put in the oil during the week.
Someone who is on they hiwy all the time such as a person that travels for a living is okay for 10K...Maybe!

 

[cammyfive79]

Good info. Won’t be doing 10k intervals now based upon all of this. I drive 9-10k miles a years personally so 2 a year is fine.

 

[crashz]

I routinely traveled 1000 miles per week (all highway) in my 2006 CRV. With an oil change every two months or so (10K mile OCI), my engine stayed clean and healthy for 310,000 miles. My niece has the car now. I ran a lot of different oils but mostly used Amsoil OE, going from a 5w-20 to a 5w-30 later as the car got a bit older and miles went past 200k. Only adjusted the valves and replaced valve cover gaskets once, which it really didn't need. It did burn a little oil, about 1 qrt over the OCI, but it was always consistent, passed emission testing every year and ran great with OK mileage.

So it can be done, but I would only recommend it if you are traveling extensively at highway speed.

 

[Danh]

Agree with avoiding 10k oil changes. I have 2 K24s and do this: use an oil extractor every 4-5k and change the filter every other oil change, as Honda recommends. Extractors work very well on the K24 and make the oil change quick, easy and cheap.

 

[BrendanC]

i run 12k OCI’s on the 03 K24 in my sig.
my 05 burns quite a bit of oil so i just top it up and change the filter/drop the oil at 12k miles

 

[Sequoiasoon]

i run 12k OCI’s on the 03 K24 in my sig.

Does the '03 burn any? How long have you been doing those 12k OCI's? How long has it been on HPL and what was oil choice and OCI's with it? What are the driving conditions?

my 05 burns quite a bit of oil so i just top it up and change the filter/drop the oil at 12k miles

And now doing VRP and EC30 to try and clean it up and reduce the burning correct? Again what is driving conditions on that? What was previous oil choice and OCI's? Are you doing VRP top ups out to 12k or less on OCI?

 

[NormanBuntz]

I've had a 2012 Accord and the current 2020 TLX with the K24 motor. I don't see any compelling reason to go beyond 6K change intervals with any name brand synthetic.

 

[OilStainedNapkin]

The k24 is a solid engine. I see a lot of 2003 and beyond accords still on the road with this engine (I had one myself at one time). I believe these were specd for conventional and per the MM it would typically go 7k miles or so. With that being said, I think you could run a solid syn like vrp to 10k and not have to worry about gumming up your engine. You can even do a uoa to confirm the engine health on that interval. Your highway driving should make it quite easy to run out to 10k imo

 

[BrendanC]

Does the '03 burn any? How long have you been doing those 12k OCI's? How long has it been on HPL and what was oil choice and OCI's with it? What are the driving conditions?


And now doing VRP and EC30 to try and clean it up and reduce the burning correct? Again what is driving conditions on that? What was previous oil choice and OCI's? Are you doing VRP top ups out to 12k or less on OCI?

03 uses to burn a quart/1000 after epr, piston soak and VRP+EC30 it only burns 1q/12k miles. note, i started maintaining this vehicle after 158k miles. it now has 192k

the 05’ has north of 400k miles on it and i believe it needs valve seals. it burns quite a bit of oil so i just top off with whatever i have around. i have about 30 gallons of Delo 5w-40 and that’s what ive been topping off with now.

 

[Astro_Guy]

See https://bobistheoilguy.com/forums/threads/mobil1-ep-5w-30-5036-miles-2016-accord.389313/ where there are two oil samples from our K24 with more than 10k miles. All samples are M1 EP but the viscosity has varied between 0w-20 and 5w-30. On the last oil change we went to 0w-30 HPL Premium Plus.

 

[JeffKeryk]

I love that engine. Our beloved 2006 TSX has 230K and has been serviced with M1 5w30 at 5K (or less) intervals. There is no need to check the engine oil between services.

For ease of maintenance, I use a MityVac and change the filter every 2nd or 3rd service.