QUOTE(dopamine @ May 17 2020, 07:50 PM)
And here is the 48 hours sample.
For Car 2, can I still continue to use it since it is only for short distance town travel daily?


Hi dopamine ,
A)Car 1 : 2014 Honda CRV 2.4L ,3200 km, 1.5 hour driving with M1 ESP 5W30 MB229.52
1)This blotter has a 2 mm thick halo around the diffusion zone (of about 60 mm OD size image) and at 1.5 hour driving , it indicates some fuel dilution problem here .
2)If this sample was taken 'cool' at say, less than 20 minutes driving (which was not) , then it is hard to say for sure about the fuel dilution problem .
3)The centre zone (of 8-10 mm OD actual of 30-35 mm size) is not darkened and opaque in colour indicating good dispersancy of ESP .
4)However this 3200 km blotter centre zone is relatively darker colour than that of Car 2 at 2388 km usage meaning there is higher level of combustion contaminants/dirt or wear particles .
5)The diffusion zone external to centre zone is quite clean and light in colour . Generally this ESP oil is still in good serviceable condition with plenty of life to go on .
B)Car 2 : 2007 Suzuki Swift 1.5L ,2388 km ,20 minutes driving with Syntium 3000 FR Ford 913D .
1)Despite low usage of 2388 km over almost 11 months duration and 20 minutes of minimal driving , this Syntium blotter has no signs of fuel dilution phenomenon . Personally ,I'm a little bit taken surprise here .
2)The centre zone is hardly formed and very transparent and light in colour and not grayish/darkish . This indicates very clean engine oil with superb detergency and dispersancy properties .
3)The diffusion zone and centre zone are very much more transparent and lighter in colour than that of Car 1 indicating this 11 month old oil is in good and serviceable condition with plenty of life left to further carry on .
4)This 11 month old oil is severely under-utilised at 2388 km usage . This should have theoretically given rise to more corrosion wear at prolong storage duration at cold oil temperature . But, the fact of the matter is the clean blotter spot image indicates this not being the case here . Hence I personally don't buy the idea or argument by oil companies/car OEMs that used engine oil cannot exceed 12 months usage (or worse ,some says 6 months) . This position of mine is further backed by multiple used oil analyses results of oils exceeding 12 months up to as much as 48 months usage in a sump . Please note also that Malaysia has no winter seasons like other users and our minimum ambient yearly temperature is 23/24*C centigrade .
Yes , IMO you can continue using the 11 month old 2388 km Syntium 3000 FR oil in your Swift by comparing its blotter spot image with those 8000 - 15000 km blotter spots from Post #1 and evaluate for yourself .
This post has been edited by zeng: May 18 2020, 03:03 PM