I dripped EO on toilet paper, haha.
Here's the result.


Attached thumbnail(s)

Typo on the date for second picture?

For the second picture, oil is dark and contaminated definitely due for a change.

I would advice against using till such condition as with contaminant shown through oil dip means there may be plenty down somewhere within the block, bearing or anywhere within reach of the oil. Clearly the oil filter is no longer working in this case.

Definitely not typo.
The dark one is BEFORE, clear one is AFTER 48hrs.

Cannot brain the logic behind haha. Mind to elaborate on the oil taken before and 48 hours after?

- double post -

This post has been edited by kirakun: Feb 17 2017, 12:18 PM

There's another saying that if your oil is clear, it isn't doing its job in suspending contaminants.

My guess also, is after 48 hours the contaminants in the oil sink to the bottom and stay suspended there leaving a cleaner oil as shown.

Ultimately, it's all guesswork.

The best and proper way is still a UOA. bar none, the end.

Your eyes definitely cannot see metal particles and those you can see are beyond spectrometer that UOA uses and that's actually prompt for concerns.

Both are the same oil, Sir.
It's the same oil drip.
One picture was taken instantly after dripping on paper. After 48hrs took another picture (of the same sample).
From beginning till the end there is only one sample.

I second your opinion. UOA is the most appropriate way to help decide for extended drain.
I did that spot test simply out of curiosity.

Waooooooooooooo .......
fantastic blotter spot at 10600 km you have, Chemistry.
Great combination of Duron 10W30 oil and this engine at 281000 km.
You could've gone on extending OCI further, IMHO.
Btw, care to share the engine/car model with us here ?

Edit:There is simply too heavy a dose of 'myths' on oils in lowyat, IMHO.
Edit2:Without chromatography laboratory paper, it's appropriate to use thick name card/printer paper/letter head etc. for relative comparisons.

This post has been edited by zeng: Feb 17 2017, 01:35 PM

Thanks for the clarification.

I'm still curious though, how did the visually visible contaminants went missing after 48 hours? Dried and evaporated into the thin air?

my guess is there wasn't any visible contaminant in the b4 pic.... the so-called contaminants are uneven spots on the toilet paper temporarily holding a minute amount of used oil, hence visibly darker and mistakenly interpreted as contaminants.

on 2nd pic, the oil spreaded/blotted over the paper over time so cant "see" the contaminants anymore.

Would anybody here says it's pure magic play by Chemistry ?

I do agree on the oil doing it's part as a part time cleaner for the engine however i'll say the color of the oil will be a more appropriate marker as the gauge, don't u think so? With that being said, isn't the oil filter supposed to filter the contaminants down to 5 or 10 microns(human hair is 45-70 micron)?

Since the oil filter is present and doing the filtration, how can the visually visible contaminants still present in oil dip? A clear indicator that the engine is mighty dirty or just the oil filter/oil is way due for replacement or both.

Don't get me wrong i also do agree that UOA is the proper mean to gauge the properties of the oil though.

This post has been edited by kirakun: Feb 17 2017, 01:35 PM

Perhaps chemistry should do another try, this time on a proper base to find out haha.

Edit: I have done spot test as well before on tissue and toilet papers but the unevenness observed was in patches rather than dots lol.

This post has been edited by kirakun: Feb 17 2017, 01:38 PM

I agree, still too much guessing here. I'd just rather follow the normal recommended OIC for my car which is 10k km using FS oil and be done with it. It's easy to remember some more, rather than every time try to extend but no peace of mind, plus the km extension makes it falls on uneven numbers of km for OIC. Just not worth it IMHO.

I think so too.
I shall do another test, for consistency , hehe..

Second test? No problem.
But my car parked rather far now...lol

Nissan AD Resort Y10, engine GA16 carburetor.
At hand now I have some bank statement white papers, i shall use the blank side for BST later.

Bank/Telco statements are good enough for our purpose,
no need wasting money go buy costly 'chromatography papers' from gwailo countries and start bragging here how good is 'chromatography papers' over bank statement papers bla... bla.... bla...
and condemning the use of 'sub standard' bank statement papers in lowyat............
leading to rubbish/guessing/tak bolih pakai results bla .... bla ... bla....

Btw, do show both the 0-0.5 hrs Blot spot AND the 48 hrs Blot spot to debunk some of the above ............rxxxxxh statements!

Noted that.
Will post here once completed.