QUOTE(ahsam1212 @ Sep 15 2021, 07:43 PM)

Here's continuation of total 10w-40 semi syn oil at about 9.5k km. 48hr blotter.
180k km proton inspira.
Will arrange to change oil in 2 weeks time.
Ooops, sorry for being late in responding as I'm just back from outstation.
There is absence of 'structures' in this 9500 km blotter which means good news.
Centre zone is not darkened or opaque but transparent, meaning presence of very slight amount of heavy or big sized contaminants.
No sign of emerging darkened aureole zone/ perimeter ring meaning there is no sign of commencement of agglomeration of dirts/soots etc.
Diffusion zone is of very slight gray and transparent indicating very low level of light-weight contaminants.
No darkened jagged external edge which I used to interpret as absence of water mositure.
But I read lately that it could also indicate very mild or minimal level of oil oxidation of this 10W40 Total. To check up further whether internal combustion engine oxidation 'products' are generally
super-light weight for it to be 'pushed' away further from the Centre deposit zone to support the above new found argument.
There is absence of translucent halo at the outermost zone indicating absence of fuel dilution phenomenon in this used oil.
Overall, i believe this 9500 km used Total 10W40 oil should be good for several thousands more km of usage.
2 more weeks is definitely not an issue.
This 180k kms Inspira engine seems to be well taken care of, imho.
Edit:
2000 kms ago this Total 10W40 oil at 7500 km had an emergent darkened aureole zone/ perimeter ring which did not deteriorate but seems to improve with further use .............. and that sounds good.
This post has been edited by zeng: Sep 17 2021, 08:17 PM