Thank you so much, @zeng , for sharing invaluable insights.
I think I'm going to stretch to 10,000km then only drain it out. 10k is enough already, considering the oil has been in service since 1-Sep-2018. Initially I planned to change oil in this week.

This blotter spot test of yours demonstrates engine oil life of today is quite independent of, or not quite influenced/dictated by :
a )fuel dilution, arising from carburretter engine , and
b )12 month usage limitation of engine oil, which does not lead to 'automatic' condemnation of oil.

The above 'conclusions' are also being backed up by numerous Used Oil Analyses.

IME, your suggested 10,000 km OCI is likely to be a non-issue in terms of used oil quality.

This post has been edited by zeng: Sep 2 2019, 10:57 PM

so this is about a week plus after applying seafoam. i think its a 72 hours pic after taking sample


and this is after 2 days change out the seafoam, with giant shell helix hx8 5w30 SL.
changed the filter as well. i believe this is also 72 hours pic after taking sample



from pic, it seems like i dont need to change the oil again (sacrificial oil) after changing out seafoam, seems pretty clear to me.
but its weird that this sample oil is gray rather than usual brown color.

but this is also first time i use this oil.

all this while using 5w30, changed to 5w40 on jan, switched back to 5w30 now, feel back the smoothness. but...i do feel like its smoother from my feel using 5w30 previously.
so it could be seafoam is really working.

Hi Bro,

This a-week plus after seafoam blotter spot looks less grayish, hence cleaner than your previous two-day after seafoam blotter spot below,

.... this presents confusion as to 'why' the inconsistencies in blotter picture appearance/display that could be explained by variations in circumstantial factors , back lighting etc between the two occassions on blotter taking.

But, one thing remains valid is the supposed 'increase' in dirt/soot/contaminants or dispersancy breakdown after one-week plus seafoam usage has not caused rapid oil deterioration to 'destroy' this HGEO 0W30 to the extent that it warrants 'so soon' a removal or replacement as advised by seafoam factory/experts.


Comparing this 2-day usage blotter spot of yours against another HX8 5W30 SL 1069 km blotter of 90Boyz several posts above, the 2 day usage blotter (after changing out seafoam'ed HGEO 0W30) demonstrate observable graying dirt/soot etc . Would the blotter darkened further ? Possibly.
Btw, I'm equally surprised at absence of yellowish/brownish coloured blotter spot appearance , as normally observed.

But at this stage of blotter appearance, I'm of the opinion this HX8 doesn't warrant immediate replacement as 'sacrificial' oil , yet. Instead it may be construed as wasteful, as far as residual oil qualities is concerned.

As regards, attributing smoothness feel etc upon oil replacement to having seafoam'ed is , IMHO, a placebo effect I speculate , unless and until this seafoam left behind adequate amounts of Moly ,Titanium and/or Boron additives after oil change, which it did not purport to claim .

This post has been edited by zeng: Sep 5 2019, 02:10 PM

UOA M1 EP 5W30 7110 miles (11,400 km) in Mazda 2.3L with fuel dilution ,TBN 4.7 .
Unable to retrace 12,000 miles UOA for now.


Edit:As I understand it, M1 EP 5W30 has a virgin TBN of 9.48 .

This post has been edited by zeng: Sep 7 2019, 01:16 PM

Simple Oil Blotter Test


Source

Honda City Gm2 year 2009
Current Odo : 113,040km
Date: 20/09/2019
Blotter time : 11pm (picture after 48hrs)
oil age : 3,155km
Engine oil used :
Type: Shell Helix HX8 X 5w30

Hi Bro,
You have a very clean 3155 km blotter spot test here, free of centre zone and also free of gray colour zone that relates to contaminants/dirt/wear etc.

I would rank this oil as in Spot 1 with plenty of life in it.



How long you intend to go on this HX8?

Edit: Is your HX8 a SL or SN ?

This post has been edited by zeng: Sep 23 2019, 11:42 AM

Hi Bro Zeng,

Again thanks for the detail explanation on my blotted spot test here, appreciate the effort.
The Shell Helix H8 X 5w30 was rate for API SN Plus/SN
For this oil i might try on hitting 10k KM and see how it goes.

Mobil 1 New Life 0W40 (from Tesco)
13021 km in 2005 Avanza 1.3 K3VE engine
ODO 292545 km
Blotter spot 72 hrs.


Absence of centre/deposit zone and its perimeter ring,
...... and going

This post has been edited by zeng: Sep 27 2019, 06:25 PM

Hi,

VOA of Shell Helix HX8 5W30 SN MB229.3 :

KV@40*C - 73.38 cSt;

KV@100*C - 12.11 cSt;

Viscosity Index - 163;

Total Base Number - 9.90

Sulphated Ash - 1.18 %;

Noack - 6.6 %;

Sulphur - 0.376 %;

Molybdenum - 39 ppm;

Phosphorous - 731 ppm;

Zinc - 815 ppm;

Boron - 2 ppm;

Magnesium - 11 ppm;

Calcium - 2942 ppm.

Technical Data Sheet:


This post has been edited by zeng: Sep 30 2019, 08:41 PM

Anyone can do blotter for Mizu oil?

It is free and easy, everyone can do ownself with a piece of A4 paper or coffee filter , by dropping one drop used oils onto the paper.
No need pay money and kept waiting for weeks ....
Post#1 has some links.

This post has been edited by zeng: Oct 1 2019, 03:19 PM

Mobil 1 New Life 0W40 (from Tesco)
14306 (not 14341) km in 2005 Avanza 1.3 K3VE engine
ODO 293830 (not 293865) km
Blotter spot 96 hrs.

Replaced with similar oil, during Ori oil seals and Ori engine and gearbox mountings replacement .


This post has been edited by zeng: Oct 2 2019, 12:31 PM

Wa...your mounting cost quite cheap leh...

Your oxygen sensor rosak?

Not sure if the mountings price is not high ...





Sorry, mistakenly deleted pictures on O2 sensor, before cleaning and after cleaning externally.
Internal can not clean, so mechanic recommend replacement, IDK.
He bought Perodua sensor (same Denso sensor but different electrical fitting) as it is cheaper than 'Toyota' sensor, but used back my old fitting.

Below are the 2 oil seals,

Yes, fuel consumption increases from 11.5-12.5 km/L to 9.9 km/L despite similar tyre pressure of 44 psi.
Computer reads old (wave oscillations) readings between 0.1 and 0.6 in Volts(?).
After sensor replacement, back to specification of between 0.1 and 0.9 , again pictures wrongly deleted.

Edit:WKC, will find you a Shell Helix HX7 5W30 virgin oil analysis.
You used SL or SN ?

This post has been edited by zeng: Aug 27 2021, 10:00 PM

The HX7 was the free engine oil provided by the dealer under free maintenance programme, don't know which rating was given, but assume is SN.

Where did you get this VOA data? Did you do it or from oil-club.ru?

From the russian oil club, sir .