For those vehicle that can do ODI up to 20,000 KM,The engine is EURO 3,4 or 5 spec, using Fully synthetic oil and some with 'Long life specification" and original oil filter.

As mostly oem recommended maximun 10K for oil drain interval because of oil filter,engine oil additive lifespan and depend on the engine design.

The engine oil contain engine oil additive which will ageing over the time,your oil may look clean but the engine oil additive that add in the engine oil will had rapid additive depletion due to our petrol sulfur contain,hot weather in malaysia, always having short distance driving,dirty or blocked air cleaner ,stuck in traffic jam and so on.

Just my 2 cent about engine oil ODI information.

ISUZU MUX oil drain interval is 20K based on OEM.

Maybe other got better idea why some vehicle had longer oil drain interval?

This post has been edited by devildevil87: Mar 25 2017, 09:42 AM

I had been monitoring UOA's of fully synthetic ; semi synthetic and mineral oils in America ......
and read-up on Blotter Spot tests method online .....
and hence pushing for longer OCI's which may be deemed as 'uncharted waters' .....
as a contribution to lowyat forum.

Edit:As of today, touching 14900 km ...... and going.

This post has been edited by zeng: Mar 26 2017, 07:45 PM

Hi, finally done 12k km.

Car make: Nissan AD Resort 1.6L
Engine: GA16 carburetted
EO used: Duron XL 0w30 (API CH4/SJ) synthetic blend
Mileage clocked: 12707km

Not bad at 12k km.

Total Quartz 7000 Energy 10W40 A3B4 SL semi synthetic;
Oil change at 16,593 km;
in Toyota Avanza 1.3L K3VE engine.
9 months as at May 2017.

48 hour Blotter spot:


Colour at oil change is not black or gray, but bright brownish and red hue.

Add:

This post has been edited by zeng: May 23 2017, 10:17 PM

I am changing new oil this week

Kindly observe colour of drained oil as used HDEO oil tends to be blackish or grayish, though still serviceable.
Btw, your engine comes with timing belt and not timing chain right?

OK, will ask the foreman to keep the used Oil Filter for me
GA16 uses timing chain.

My understanding of timinig chain is it shears oil viscosity in use, probably up to 10,000 km or so.
With 'life time' timing chain in my Avanza K3VE, xW40 is my go-to oil, among other operating conditions.

Most of the oil shearing are at the high pressure areas like the cam lobes, valve heads/rocker, crank bearings, crank journal, etc. If don't explore much rev above 4000rpm, most of the oil degradation is from the depletion of the additives, not really due to oil shear.

Yup gonna change to Duron XL 15W40 soon.
0w30 variant sold out already haha..
This motor prefer high SAPS oil.

Done oil change just now. Labour RM15.
Observed colour of drained oil, it was dark brown.

Wa...the labour cost at your place so nice one. My side at least double

Haha, ya, RM15 is considered as minimum labour charge nowadays. Somemore got free checking air filter, coolant level, brake fluid level, power steering fluid level , although I myself can check too.

UOA's of black coloured (including those with dark hue) used oils on Bitog do often indicate continuing serviceability of said oil with good/low metal wear rates, Flash point, TBN, insolubles etc.
Plus your uploading of Blotter spot tests before this, I would speculate this dark brown coloured used oil is probably still serviceable.
Engine varnish, if any, in itself is not a sign of definite engine failure.

Agree with you.....
and timing chains and turbos do contribute to viscosity shearing.



https://bobistheoilguy.com/valve-train-and-...ing-chain-wear/

This post has been edited by zeng: May 24 2017, 06:52 PM

Yeah I think so too , but given the oil already in service for 17 months, i think it already well reflected its value

Conclusion on ..?

Without knowing your engine type, its mechanical conditions, your driving pattern etc , my short answer is no .....
assuming you're in the typical league of early oil change (like mineral oil for < 5000 km; semisyn oil for <8000 km and fullsyn <10000 km) as Insurance , peace of mind bla bla bla.
Heck, most of you guy's oils are without ACEA A3B4 specifications! ..... never mind it's fully synthetics.

Do note Quartz Energy 10W40 has favourable specs in ACEA A3B4, among others like API, VW and MB for components protection.

I've stacks of fullsyn like Shell Ultra 5W40 and Mobil 1 0W40 ..... likely OCI in this (Japanese) engine would be 18000-20000 km...... in times to come.

This post has been edited by zeng: May 28 2017, 05:11 PM

Round B.
Total Quartz 7000 Energy 10W40.
Avanza 1.3L K3-VE
5087 km in use.

72 hour Blotter Spot Test





... and going.

This post has been edited by zeng: Aug 17 2017, 11:40 PM