RB25DET Engine Oil Dipstick Length

[DraftySquash]

Hey everyone!! 

I've noticed that whenever I do my oil changes, after putting 4L in, the oil level sits at the top mark in the dipstick. This is after letting the old oil drain for a very long time too! I've checked the oil level daily for the past few mornings.
It happens every time and it's confusing because all the threads say that it should take about 4.7L (With some just adding the full 5L)

My next thought is to figure out if the dipstick I have is correct so could someone please tell me the length of the RB25DET engine oil dipstick? 

I've checked images of some of the genuine dipsticks, but none of them have the length in it.

https://justjap.com/products/genuine-nissan-engine-oil-level-dipstick-fits-nissan-r34-skyline-c34-stagea-c35-laurel-y34-cedric-gloria-rb25de-t-neo?currency=AUD&srsltid=AfmBOortQXofgmiHVRKuIaiKuygL4k0Ewp68c3isGZk0vvKOJ7Yqf3iB

However.... the engraving on the genuine ones say 05002 while mine says AA000. This makes me believe that maybe I have a wrong dipstick? I just want to confirm before I buy a new one. The car is a fresh import from Japan so I don't have details of the previous owner to ask him.

Thanks in advance 🙏🏾 

Edited Saturday at 04:00 AM by DraftySquash

[joshuaho96]

3 hours ago, DraftySquash said:

Hey everyone!! 

I've noticed that whenever I do my oil changes, after putting 4L in, the oil level sits at the top mark in the dipstick. This is after letting the old oil drain for a very long time too! I've checked the oil level daily for the past few mornings.
It happens every time and it's confusing because all the threads say that it should take about 4.7L (With some just adding the full 5L)

My next thought is to figure out if the dipstick I have is correct so could someone please tell me the length of the RB25DET engine oil dipstick? 

I've checked images of some of the genuine dipsticks, but none of them have the length in it.

https://justjap.com/products/genuine-nissan-engine-oil-level-dipstick-fits-nissan-r34-skyline-c34-stagea-c35-laurel-y34-cedric-gloria-rb25de-t-neo?currency=AUD&srsltid=AfmBOortQXofgmiHVRKuIaiKuygL4k0Ewp68c3isGZk0vvKOJ7Yqf3iB

However.... the engraving on the genuine ones say 05002 while mine says AA000. This makes me believe that maybe I have a wrong dipstick? I just want to confirm before I buy a new one. The car is a fresh import from Japan so I don't have details of the previous owner to ask him.

Thanks in advance 🙏🏾 

AA000 is for R34 GTT. 11140-05002 is not a part number that exists in Nissan's parts catalog. R33 GTST is 11140-21U00. 11140-05U02 is for the RB26.

[GTSBoy]

405mm from the underside of the flange to the tip. I will have photos soon.

Mine is in a Neo, is AA000.

[GTSBoy]

[DraftySquash]

On 4/1/2025 at 6:46 PM, GTSBoy said:

405mm from the underside of the flange to the tip. I will have photos soon.

Mine is in a Neo, is AA000.

Thanks a lot for this @GTSBoy

Mine is a NEO too so this is a good reference. It’s just weird because I’m putting in 4L and it already reaches the H mark 

[DraftySquash]

Hmmm interesting. Mine is the exact same and clearly the right one. 
The mystery of the engine oil being full after 3.5-4L continues 

[GTSBoy]

3 or 4 8-balls in the sump?

[DraftySquash]

Must be for the car’s lucky charm 🤷🏽‍♂️

She runs fine, but it just seems to take about 1L less. Maybe I’ll have the oil sump dropped at some point to check if there is anything 

Edited Saturday at 02:20 PM by DraftySquash
Typo

[joshuaho96]

21 hours ago, GTSBoy said:

3 or 4 8-balls in the sump?

I could see someone trying this to save money on oil changes.

[joshuaho96]

18 hours ago, DraftySquash said:

Must be for the car’s lucky charm 🤷🏽‍♂️

She runs fine, but it just seems to take about 1L less. Maybe I’ll have the oil sump dropped at some point to check if there is anything 

You can try shoving a borescope down there to see what's up.

[DraftySquash]

On 05/01/2025 at 7:19 PM, joshuaho96 said:

I could see someone trying this to save money on oil changes.

It didn't save me any money! All it did was leave me with 3x 5L Engine oil bottles that have about 1-1.5L left in them 🤣

[Milkmun]

On 06/01/2025 at 8:55 PM, DraftySquash said:

It didn't save me any money! All it did was leave me with 3x 5L Engine oil bottles that have about 1-1.5L left in them 🤣

Curious as to why you wouldn't finish the first bottle on the next service and so on, avoiding 3 bottles of left overs.

Edited Monday at 11:26 AM by Milkmun

[Duncan]

On 04/01/2025 at 2:57 PM, DraftySquash said:

.....all the threads say that it should take about 4.7L (With some just adding the full 5L)

hmmmm...what does the service manual say though?  Also, are you changing the filter at the same time or not, that generally makes a 500ml difference

[DraftySquash]

@Duncan Yes, changed filter every time. I don't have the service manual for the car yet (Car was imported and they removed everything when importing). I've been using the oil change threads in the forum as reference.

 

@Milkmun The second oil change was after ~4 months after the first months and I wasn't sure about reusing engine oil that was opened.

The third oil change happened within 3 weeks of the second oil change and I used the previous leftover oil to just "clean up" the system. (Poured it through while the sump plug was open")

[GTSBoy]

17 minutes ago, DraftySquash said:

I wasn't sure about reusing engine oil that was opened.

Of course you can.

17 minutes ago, DraftySquash said:

Poured it through while the sump plug was open

That was a waste. Straight down one oil drain gallery and out the sump hole. Could at least have run the engine a little (obviously with at least minimum oil level on the stick).

[DraftySquash]

Well.... that's very good to know for next time!! @GTSBoy

Atleast something to remember while I try find out why my capacity is less according to the stick

[joshuaho96]

2 hours ago, DraftySquash said:

@Duncan Yes, changed filter every time. I don't have the service manual for the car yet (Car was imported and they removed everything when importing). I've been using the oil change threads in the forum as reference.

 

@Milkmun The second oil change was after ~4 months after the first months and I wasn't sure about reusing engine oil that was opened.

The third oil change happened within 3 weeks of the second oil change and I used the previous leftover oil to just "clean up" the system. (Poured it through while the sump plug was open")

I just did an oil change on my daily which used oil that is probably 2-3 years old. Normally I try to follow exact viscosities, but my LS400 is fairly tolerant. Dumped something like half a quart of 0W30 Mobil1 ESP X2 in there, followed by 2 quarts Pennzoil 5W30, followed by ~1.2 quarts of liquimoly 5W30 LL04 spec oil. Then the rest was QS euro 5W40 which is actually so thin it's basically a 30 weight oil.

All this is to say it doesn't matter that much. We aren't talking about brake fluid. For an RB I would recommend a high ZDDP oil because it doesn't use rollers in the interface between the cam and valve, but a 5W30 or 5W40 is fine to use for street use. The 10W60 guidance really only applies if you're getting it hot and pushing the engine hard.

Edited yesterday at 02:14 AM by joshuaho96

[GTSBoy]

12 minutes ago, joshuaho96 said:

The 10W60 guidance really only applies if you're getting it hot and pushing the engine hard.

It be 40°C outside lately. 10W60 is a good idea here. Well, certainly 10W50.

Edited yesterday at 02:20 AM by GTSBoy

[joshuaho96]

10 minutes ago, GTSBoy said:

It be 40°C outside lately. 10W60 is a good idea here. Well, certainly 10W50.

Reminds me I really need to install that HKS oil cooler I bought years ago.

[DraftySquash]

On 07/01/2025 at 1:07 PM, joshuaho96 said:

The 10W60 guidance really only applies if you're getting it hot and pushing the engine hard.

hahaha @joshuaho96 the most action it gets is when I have to drive from West to SE VIC to meet the fam. Even then, it;s on highway cruising speeds