Shell Helix Ultra 5W40 (MB229.5) + Helix HX5 15W40
Oil Life : 16,286 km
10 months oil life thus far since Sept 2023.
ODO :382,742 km in
Car model: Toyota Avanza 1.3L

Note:
Top up at 12,000 km about 0.8L of mineral Shell Helix 15W40 (Yellow packing, SN) -due to timing cover oil seal leaks.

Samples were taken hot within 10 minutes of engine shut down after a 2 HOUR drive.

72 hours blotters:

a)With back light
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b)With NO back light
[attachmentid=11500261]

The Centre Zone (of about 8 mm diameter) of this 2 hour drive 16K km blotter is generally transparent and shows absence of heavy metallic wear particles vs previous 15K km sample above.

A greyed aureole zone/perimeter annulus (of about 10 mm diameter size) is  kind of non-existent  and stays clear, showing no signs of commencement of agglomeration phenomenon of contaminants. That is good news in this 2 hour drive blotter sample.

Comparing against previous 15,278 km  blotter sample the current 16,286 km Diffusion Zone and darkened zig-zag outer edge are not deteriorating further. 

The translucent halo zone has greatly improved in this 2 hour drive blotter -  indicating less severe form of fuel dilution phenomenon.

The blotter shows no indication of radiator coolant contamination of used oil.

Overall this 2 hour drive blotter points to engine oil works best (and stay happy) in long long drive vs that of short tens of minutes drive.

I'm planning to go on further with this 16,286 km used oil, albeit being a 'rojak'.

Did go on until  around 20k km.

No surprises here for a rojak oil.

Will see if I can retrieve images for this blotter spots of around 20k km, no promise though.