Engine : K20A
Oil : Liqui Moly Special Tec AA 5W-30 with Ceratec additive
Mileage : 11k +
Blotter Spot Test Oil Analysis:VOA Helix HX7 5W30, 16,286 km blotter Shell Helix Ultra 5W40
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 Dec 19 2017, 03:14 PM
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#1
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Senior Member
2,730 posts Joined: Jan 2003 From: In the shadows behind you  
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I tried the test, not really sure how to interpret it
Engine : K20A Oil : Liqui Moly Special Tec AA 5W-30 with Ceratec additive Mileage : 11k +
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Dec 20 2017, 02:14 PM
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#2
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Senior Member
2,730 posts Joined: Jan 2003 From: In the shadows behind you
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QUOTE(zeng @ Dec 19 2017, 11:06 PM) Thanks for upload. All image is >72 hours Though the image is blur'ish, it looks like to me there is no signs of presence of centre zone (oil drop size of about 6-8 mm diameter) and absence of greying/darkish coloured patches (meaning insolubles, oxidation contaminants, combustion byproducts etc), which is good news. Can you upload a clearer image preferably 48/72 hours after drop to confirm presence/absence of centre zone and greyish/darkish patches inside and outside of centre zone ?   Lighting and camera not so good, but below is how it looks from further away. Above single blot from a different engine, with what i can only assume is newer oil, not sure the mileage or oil used. Bottom two blot from the same engine as previously. 
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Dec 21 2017, 11:25 AM
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#3
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Senior Member
2,730 posts Joined: Jan 2003 From: In the shadows behind you
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QUOTE(zeng @ Dec 21 2017, 12:13 AM) Unitron, I am of the opinion that this 11k+ Blotter shows absence of centre zone (of about 6-8 mm diameter) ...... and this is good news that oil detergency and dispersancy is still in tip top capacity without extensive agglomeration of oxidative/combustion products etc. Thanks sifu @zeng There is very mild 'greyish' patch indicating 'low' levels of oxidative/combustion products and insolubles. I believe this used oil is still serviceable and would recommend taking another blotter spot in 1500-2000 km, if you haven't replaced the oil. JMHO.  Too bad i didn't wanna risk it too long since already >1 year since last oil change, I changed the oil already. Trying out Castrol Magnatec Stop-Start fully syn 5W-30 |
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