QUOTE(Andy0625 @ Dec 6 2020, 04:09 PM)

Hi Zeng, just sharing my 1800km blotter test with the same engine but with Aisin 5w30 pao+ester with ceratec.
Should I be worry about the silver lining around?
QUOTE(Andy0625 @ Dec 8 2020, 10:14 PM)
Its currently around 137k km, Proton CFE engine. Yes, it's a 48 hour blotter test.
Hi Andy ,
Having come across reasonably well performing blotter spot of a
12,000 km Aisin pao+ester 5W40 (sibling to 5W30) , I was a bit taken aback by the obvious emergence of slightly darkened aureole zone aka perimeter ring in this low mileage 1800 km blotter .
Initially I thought ceratec , which I don't know much about , may have a role in this grayish aureole zone .
Going through
Post # 1 of this read and I found this Campro CFE turbo engine had a previous blotter spot of
5,218 km of Petronas SN 5W30 , in use immediately after
DPS Engine Flush application prior to using Petronas oil .
That previous Petronas blotter also displayed a similar phenomenon in slightly darkened aureole zone which I speculated then it is to be related to DPS flush .
Now , this second oil use of Aisin 5w30 pao+ester also display a slightly darkened aureole zone /perimeter ring in a very low mileage of 1800 km .
I would speculate , again that it is related to that particular DPS engine flush usage prviously . True or not , only time will tell IMO .
As regards the
silver lining external to this Aisin blotter spot test sample or halo as I call it , it is likely an indication of engine fuel dilution problem IF this blotter sample was taken hot i.e after 20 minutes or more of driving . Since you did not indicate clearly or thoroughly , this silver lining resembling fuel dilution can also be related to cold temperature oil sample when taken IDK .
IMHO, this 1800 km used oil is obviously
still in serviceable condition for a long time to come and I don't think you should be worried about this silver lining , which is negative in a way .
This post has been edited by zeng: Dec 9 2020, 10:39 AM