Hi bro,

You did right with sample taken after 40 minutes engine running, exceeding my rule of thumb of minimum 20 minutes of engine operation.

With hot oil sample being taken, it would point to strictly fuel dilution phenomenon should the upcoming 48 or 72 hour blotter spot test develops translucent halo at the outermost zone ....
ruling out effects of cold blotter sampling method.

Please keep viewing/observing the 'ever changing' blotter sample images (for self education) until say, 48 or 72 hours post sampling till such time it sort of 'matures' and then upload the mature 48/72 hour blotter spot test image for more meaningful comparative assessments/interpretations vis-a-vis all the other 48/72 hour blotter spot tests in this thread.

Btw, you have here a rather high quality/spec engine oil in this local Petronas Syntium 3000 5W30 SN+.
It is a mid-SaPS engine oil of 0.8% weight Sulphated Ash (Hence I expect its superb performance, never mind the fact this Syntium is not ACEA spec'ed).
Don't worry about its seemingly low'ish TBN of 8.0 , my dear friend.
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Hi Bro,

Thanks for uploading these 48 hour blotter spot tests which I believe have kind of 'matured' and are not having vastly evolving changes with time,  in the image.

Basically these blotter spots are lacking in undesirable 'structures' ..........
meaning the used oil conditions are in top form with plenty of life to go.

Centre zone (of about 8 mm diameter size in real sample) is not darkened and is clean and transparent, which is good news as it indicates very little or negligible amount of heavy and/or big sized contaminants/dirts being present in this 3k kms 5 months 5W30 sample.

There is also absence of darkened aureole zone/perimeter ring indicating the oil's detergency and dispersancy capabilities and properties of the used oil is intact and in top form.
Besides , there is absence of coagulation of contaminant particles which is good news.

Diffusion zone external to 'perimeter ring' (which is not darkened here) is light coloured and transparent showing very very low levels of combustion contaminants/dirts.

Darkened and jagged edge outside of Diffusion zone is absent , indicating absence of undesirable water moisture content in this 40-minute operation hot oil.

At the outermost zone, there is some slight appearance of translucent annulus called halo which indicates mild level of  fuel dilution phenomenon in this hot blotter sample, which remains harmless for now with very little contaminants/dirts in this 3k kms 5 month used oil sample.

Overall IMO there is a lot more oil life to go on and this used oil is fit for continuing service.

Can this used Syntium 5W30 continue to be in operation till Odo 140k kms, meaning a 10k kms oil change interval or 12 months use in Campro ?

Well, I believe this Syntium 5W30 should perform well till then whilst you may continue to take blotter spot test say, at 6000 km and 9000 km mileage with a view of establishing the possibility of 10k kms oci, at a level/mileage comfortable to you.

Don't worry about the 'black dots' you mentioned  as they are merely 'imperfections' in sample taking on a used/old A4 sized paper and it doesn't distort the 'reading' of blotter spot.

Hi Bro, sorry for the slow reply and thousand apologies.

This is a superb 6000 km blotter spot with total absence of 'structures' demarcating the various zones of this 10.5 month used oil which is a good news.

The Centre Zone is generally clean, light coloured , transparent and not greyed or (slightly) darkened indicating very low levels or absence of heavy or large size insolubles/combustion contaminants within the sample.

There is also obvious absence of greyed/ slightly darkened aureole zone/perimeter ring indicating absence of agglomeration of insolubles/dirts  probably due to very low levels of contaminants within the 10.5 month used oil sample.

Diffusion Zone is generally very clean, light coloured and transparent indicating very low levels of fine-size or light-weight contaminats/insolubles.

The above observations would likely give you a UOA (if you care to pay for one) of very very low ppm levels of metal wear element counts  and insolubles content.

Darkened jagged zig-zag external edge is absent from the blotter indicating very very negligible oxidation level of this used oil or absence of moisture content.

At the outermost zone in the blotter sample with back-light 'exposes' the presence translucent halo indicating fuel dilution phenomenon. This fuel dilution phenomenon is sort of 'undetectable' from blotter spot test without back-light.

Hence, a blotter spot test does have its limitations or inadequacies just like any other methodologies of used oil analysis, among others.

Overall, I would consider this 10.5 months old/6000 km blotter spot as clean and good to go on for further use.

Besides,  the used oil sample/engine mechanical condition combo  is in top shape although I'm actually a little bit surprise to having seen/found fuel dilution phenomenon in this blotter immediately after a 270 km/4 hour drive.

Not sure whether a fuel dilution phenomenon in this Campro engine could be improved upon with engine (ECU) 'tuning' and/or application of injector nozzle cleaning fuel additives leading to improved fuel economy?