Any 15W40 would offer even stronger (or thicker) oil film thickness protection than any 0W/5W-40 or 0W/5W30 with quite similar additive package .
Yes, you get higher level of protection relatively .
I would prefer one with a stronger European specs ACEA A3/B3 found in Helix 15W40 , not sure about GTX though .
6-8 months oil change ? From blotter spot tests performance , I personaly see no problem with up to 12 months or 8000-9000 km in a typical mineral engine oil .
You can test and observe with blotters and evaluate , free of charge and convenient .

This post has been edited by zeng: Jul 7 2020, 09:35 AM

My old school mech has been using HX5 15w40 for the longest time I serviced with him before he retired. Always added one tin Bardahl B1 and he mentioned can stretch more than 5k kms. Guess there is some truth in his words. Next round change I would post some blotter test here.

First time doing the blotter spot test...

Car model: Myvi D20N
Engine: 2NR-VE
EO: Perodua 0W20
ODO: ~43K km
Oil mileage: ~6161km


Upon dropping after approx. 20min of driving


After 48hr


After 72hr

This post has been edited by Blank19: Jul 14 2020, 10:50 PM

Hi Bro ,

Sorry for the delayed response . Was busy last few days .

This 6161 km blotter of Perodua is free of structures meaning good news as the oil is quite clean and very minimal harmful debris or combustion contaminants .

Basing on picture outer diameter of 54 mm (as equivalent to 32 or 33 mm OD in original blotter sample in your hand) after a right click , the 13 diameter size of deposit/centre zone is kind of absent from blotter and generally not opaque or darkened with mild transparency . It means the 6161 km sample has very low levels of soot and no coagulation of combustion carbon debris within the used oil .

The perimeter ring or aureole zone in annulus shape between Diameters 13 mm size and 16 mm size is sort of absent too as the annulus is not darkened . It means the dispersancy/detergency properties of the used oil has not begun to breakdown and is still in top performance condition .

The dispersion zone between Diameters 16 mm and 54 mm size is very slightly grayish (and not very darkened) indicating very low levels of oil oxidation and minimal oxidised carbon contaminants which are very well dispersed by the used oil and its additive .

External to the 54 mm outer diameter of this blotter is the fuel dilution zone , which appears to be absent as there is no circular halo around it , meaning there is no problem of petrol fuel dilution in your Myvi engine .

There is also absence of darkened starburst jagged-look shape 'annulus' around the 54 mm diameter size outer edge indicating your used oil sample is very free of water moisture content , which is another good news .

As usual , there is absence of glycol/coolant in the used oil sample .

Hence, this used Perodua 0W20 oil at mileage 6161 km usage still has plenty of life left for you to carry on , IMHO .

Attached below here, the green rectangles represent my interpretation of this 6161 km oil sample .


This post has been edited by zeng: Jul 16 2020, 05:13 PM

No worries at all and thanks for the detailed analysis bro zeng.
These would be a good reference for the next blotter test when the oil is approaching the "recommended" 10k OCI

It is good practice to compare blotter spot test images as the oil usage is in progress , to learn and 'feel' how the used oil is deteriorating with use , extended or otherwise .

Assuming your intended OCI is 10K km , it makes good sense for the benefit of other readers here to share samples at 8000ish km mileage and subsequently a day or two before 10K mileage oil change day and upload here accordingly as part of 'learning' for all on oil life deterioration/progression from real life cases .

Edit: By the way , you could go to Post #1 of this thread for links to other blotter spot images of different km mileage, same or different engine and other different oil brands and viscosity grades , to have a feel of comparative relative performance of your set of engine oil/engine model vis-a-vis all others .

This post has been edited by zeng: Jul 17 2020, 10:35 AM

Honda City GM2 year 2009
Current Odo : 128,730
Date: 28/07/2020
Blotter time : 10:00am (picture after 24hrs)
oil age : 6,912km
Engine oil used : Amsoil Signature Series 5w30




Photo after 48hrs

This post has been edited by 90Boyz: Jul 30 2020, 09:23 AM

Hi Bro ,
There is absence of both dark centre/deposit zone and darkened aureole perimeter ring , also known as 'no structures' of several circular rings , which are good news in pristine condition of this 6912 km used oil .

Across the slightly grayish diffussion zone indicates a mild or low level of contaminants/debris/soot .

Absence of external jagged brown edge may mean absence of water moisture content .

There appears no fuel dilution problem .

This 6912 km Amsoil used oil is serviceable for a while , IMHO .

Thanks bro Zeng for the explanation
Just to ask this oil in your opinion what mileage it can goes ?

I personally would not replace and drain this used Amsoil SS 5W30 oil at 15000 km or below , instead I would attempt to run till 20,000 km or thereabout as I had no qualms running up to 17,000 km with oils like semisyn Total 10W40, fully synthetic in Shell Ultra 5W40 and Mobil 1 0W40 .

This Amsoil is a very 'powerful' oil with OEM approvals from GM/Ford/Honda and being A5B5 with huge doses of Molybdenum and Boron as per a 2019 VOA attached below .

As your OCI 'comfort' level is probably not as high as mine , for a start you may consider 2000-3000 km extra over your 'record' OCI km and verify with Blotter Spot Test .



Edit :You may refer to Post #1 for VOAs' of other oils .

This post has been edited by zeng: Jul 30 2020, 06:10 PM

Do you recommend changing oil filter in between long intervals or buying a more expensive oil filter (for eg. K&N/Amsoil/etc.)?

Hi e-lite ,

I do not buy into the marketing on 'undoubtedly' super duper qualities of boutique oil filter (ignore air filters for now as you are refering to oil filters ) brands like K&N/Amsoil etc (my apology to related fan crowds out there yeah) not that it is inferior or fake or whatnot , but I am not concerned about 'better quality' of boutique oil filters in the context of 'conventional' wisdom in replacing oil filters at every 2 oil changes of 5000 km , totaling 10,000 km in my Avanza/Mitsubishi wira recommendation .

In newer Asian models where OEM recommends OCI of 10,000 km , I expect some (not sure) OEM recommends oil filter change at every oil change , meaning oil filter life is still 10,000 km .

I would love to learn from you readers where 20,000 km oil filter life is recommended (at 2 X 10,000 km OCI) for I really don't know for a fact in local OEM practice .

Hence, my Avanza/wira RM12 cheapo oil filter provided by my mechanic (whose oil filter brand recommendation that I entrusted him to ) has all along been progressively replaced at 2 X 6000 km ;
> then 2 X 8000 km ;
> then 2 X 10,000 km totalling 20,000 km oil filter life .

However, for now I do not manage to convince my mechanic on 2 X 15,000 km oil filter change/life but settle and stay at 1 time 15,000 - 17000 km .

My assessments above are based on various foreign (U.S and Russia) UOA's vis-a-vis metal wear limits set by UOA laboratories and images/photos of various Blotter Spot Tests .

Note: I had not considered here European OEM's oil filter life recommendatons , thus far .


Edit: On the bold above , I am prepared to discuss further with readers on my logics or line of thinking , not with a view of challenging one's position or preferences or bias or decision etc .
This discusssion would be meaningful if it is specific to a particular unit oil filter with published and known 'enhanced quality specifications' such as micron size ratings/filtering efficiencies etc vs that of general RM12 oil filter .

This post has been edited by zeng: Jul 31 2020, 12:14 PM

Mobil 1 New Life 0W40 (Tesco) MB229.5
Oil Life : 12,367 km (72 hour blotter)
ODO :306,197 km in
Car model: Toyota Avanza 1.3L
Engine: K3VE Multi Port Injection
Added some 100 mL of graphited engine oil



A light gray centre zone but not darkerned indicates quite low level of combustion by-products .

Absence of darkened perimeter ring/aureole zone surrounding centre zone indicates no agglomeration of dirt/carbons and detergency/dispersancy capability in tip top conditions .

Generally light coloured and transparent diffusion zone indicating low levels of dirt/carbon/contaminants .

Exterior jagged edge not as darked as like before , indicating absence/low levels of water moisture .

Outermost translucent zone/halo seems no sign of fuel dilution .

Intended to go on for another few thousand km .

This post has been edited by zeng: Sep 2 2020, 01:27 PM

Mizu 5w30 fully syn
Oil Life : 2582km (3 hour blotter) - 2 Dec 2019
ODO : 196252 km
Car model: Perodua Myvi 1.3L

Toyota Oil 0w20 fully syn SN GF-5
Oil Life : 3262km (3 hour blotter) - 17 Nov 2019
ODO : 180322 km
Car model: Toyota Prius 1.8L




Attached thumbnail(s)

Hi bro,

Typically this 3262 km TGMO 0W20 SN blotter spot has no structures like darkened centre zone, darkened perimeter ring/aureole etc which is good news as it indicates low levels of contaminants and excellent capability in its detergency/dispersancy properties .

No jagged darkened edge shown .

Halo of fuel dilution seems absent despite this Prius being a hybrid (?) .

If this is hybrid , approximately how many percent of this 3262 km usage was run on engine ?

IMO, this used oil is in serviceable condition and properly fit for many thousands of km continuing service .

This post has been edited by zeng: Sep 3 2020, 11:17 AM

Like to seek some clarification whether this Mizu oil you sourced from shopee/lazada/Tesco ?

.... and whether it is the same as this Mizu ?



This post has been edited by zeng: Aug 26 2021, 11:39 AM

Any idea why doing this ? how to see the result to determine good engine oil or the car engine condition ? please enlighten me & thanks

Have a read on the link :
Blotter Spot Test Helps Improve Engine Reliability
from Post # 1 of this thread .
The other 14 links are provided at the bottom of the Post for further reading on this subject of Blotter Spot Test .

One may wonder why there is so much talks/advertisements about Used Oil Analysis and none about Blotter Spot Test .

The answer is there is no $$$ to be made from promoting Blotter Spot Tests which are cost-free !

This post has been edited by zeng: Sep 3 2020, 12:54 PM

Yes, this is a hybrid car. Unfortunately there are no stats to show how many percent of the mileage are using battery vs ICE. I will be changing this soon to Aisin evotech+ as I do not want to keep the oil for too long in the car.


This Mizu oil is bought from official Mizu store in Lazada. Same as the your link.

This post has been edited by abubin: Sep 3 2020, 04:19 PM