QUOTE(Benck @ Jan 22 2021, 01:05 PM)
Hi Zeng,
This is my new finding I found this useful blotter test, please advice me if I did something wrong and lets discuss and learn new things around us.
I would like your advice about my oil. Taken this oil after 10mins of engine shut down after a 30mins smooth driving on less traffic road. Picture was taken 72hrs after oil was dipped on envelope paper.
Oil: TOTAL Semi Synthetic.Quartz 7000Energy. 10W-40. Aeon BIG.
Age of oil: 6 months
Oil filter: HAMP
Age of oil filter: 12months
Oil Mileage: 2600KM(distance is not accurate here since I always spend half of my driving time in waiting at traffic light)
Engine hours: 85hours(I guess this is better way to measure my super short city stop and go driving)
Vehicle: Honda Accord S86.Year 2000.
Engine: F23A(2,254 cc) SOHC VTEC.
Driving condition: 1week 7days of daily driving to work place, Usually 13min per drive.
92% short distance city driving,8% or 7hours for a long distance drive(about 600KM).
First start of the day in the morning never idle warm up just drive slowly in my taman for around 1KM/2minutes.
All the way using auto shifting that is mean my RPM always below 2000RPM.
Is there alot of soot in my oil? What do you think I switch to HDEO 10W-30 CI-4 oil for 3months just for cleaning purpose?
https://forum.lowyat.net/uploads//attach-48...-1611291568.jpgThank you.
Hi Bro , glad to learn that you find this blotter test thread useful . I hope its practice would help taking away from users some emotional stress/worry/tension whilst agak'ing (speculating) extent of 'damage' to one's equipments/engines .......
needlessly and 'unjustifiably' raising one's blood pressure to higher levels and the best part is , it is Free and Easy .
Hmm.... you do very well indeed in the way your procedure have been appropriate in taking oil sampling for blotter test IMHO .
Now on centre zone . It is slightly grayed though 2600 km mileage (in 6 months) is low'ish . Good news is it is not darkened and it is not opaque ,yet .
However, such low mileage used oil shows rather obviously quite dark/blackened aureole zone/perimeter ring indicating 'unwanted' agglomeration of combustion by-products/contaminants .
The further aggravation/deterioration of Detergency and Dispersancy properties of a functioning engine oil could lead to unusually high metal wear rate between the contacting surfaces within the engine .
Hence, you may want to monitor closely the degree of darkness and transparency of the aureole zone .....
as far as this Honda engine of yours is concerned .
External to the aureole zone , the diffusion zone is transparent (good news) basically ....
and its contaminant/soot/dirt levels are not high IMO , as an unknown portion of the combustion contaminants had been 'retained and agglomerated' at the aureole zone and its creation (which is bad news) and prevented from further diffusing and traveling in outward direction from deposit/centre zone to the diffusion zone .
There is absence of darkened jagged zig-zag edge outside of diffusion zone indicating negligible or undetectable level of water moisture within the used oil sample .
There is some halo signs in the external zone indicating presence of fuel dilution phenomenon which may be considered as 'typical' of a low mileage 2600 km oil over 6 months usage .
IMHO , your Honda engine mechanical condition could be further improved by increasing the frequency or number of round trips per start for > 30 minutes and exceeding 3000 rpm ...., long distance driving is better still .....
Absence of warm up idling at morning start is good for fuel economy and good to warm up engine oil in a short time duration which in turn helps retain good engine condition .... do carry on as you did .
I don't consider this 6 month oil as having high levels of soot/dirt/contaminants and instead , I think it is the unwanted, early and 'premature' oil contaminants
agglomeration in such low 2600 km mileage oil that is worrying/unwelcome to users and this is to be prevented from emerging or, if emerged from further deteriorating .....
Your suggestion of switching from PCMO to HDEO (10W-30 CI-4) is indeed very very well placed with its super duper Detergency and Dispersancy properties , which is essential and useful in tackling your current oil contaminant agglomeration phenomenon, which as and being a prerequisite, that leads to deterioration of oil Detergency/Dispersancy properties consequentially causing high metal wear rates ........
should you continue with your current poor and bad driving pattern of 13 minutes per start, among others .
Overall, I'm of the opinion this used 2600 km 6 month oil is still serviceable and fit for continuing service .
Edit : Ooops ..... a second sample , give me a bit of time please .
This post has been edited by zeng: Jan 23 2021, 12:33 PM