Jun 18 2018, 04:35 PM
QUOTE(zeng @ Jun 18 2018, 02:55 PM)
Hi Elite,
This Mobil Delvac MX 15W40 (can you confirm please?) blotter generally has 3 zones namely:
a)Quite a large area of (elongated) centre zone that is surrounded by a faint shape of grey-coloured perimeter ring:-
This centre zone is very mildly grey or dark coloured indicating quite a small/mild amount of contaminants like soots, combustion by-products, dirt etc
The engine combustion system seems good to me.
b)Relatively small area of intermediate 'diffusion' zone indicating additional capacity to absord more contaminants from the system if any;and
c)Relatively large area of outer-most (fuel dilution) zone indicating a large amount of low viscosity light density oil (gasoline fuel in this case) are being spread outwards, away from the centre zone. It also means a higher level of fuel dilution in this blotter spot test.
Is this fuel dilution severe ? Well, compared to other blotter spot samples here, it's more serious or extensive.
However looking at its contaminant levels in centre and intermediate zones, I would interpret the fuel dilution as not detrimental to the continuing service of this oil sample at 740 km 20 hour track time.
By the way, what's OEM recommendation on oil change interval in km or hour track time ?
The virgin KV100C of this Delvac MX 15W40 is 15.5 cSt, and it may have dropped by as much as up to 20% as a result of fuel dilution. However the blotter spot indicates acceptable level of contaminants (with capacity to absorb more contaminants) , hence personally I won't be replacing this used oil.
Heck, I have zero experience on motorcycle oil thing btw.
Thanks for your response. I fully agree with you. As the oil mileage is only 740km, soot levels/blackness is acceptable.This Mobil Delvac MX 15W40 (can you confirm please?) blotter generally has 3 zones namely:
a)Quite a large area of (elongated) centre zone that is surrounded by a faint shape of grey-coloured perimeter ring:-
This centre zone is very mildly grey or dark coloured indicating quite a small/mild amount of contaminants like soots, combustion by-products, dirt etc
The engine combustion system seems good to me.
b)Relatively small area of intermediate 'diffusion' zone indicating additional capacity to absord more contaminants from the system if any;and
c)Relatively large area of outer-most (fuel dilution) zone indicating a large amount of low viscosity light density oil (gasoline fuel in this case) are being spread outwards, away from the centre zone. It also means a higher level of fuel dilution in this blotter spot test.
Is this fuel dilution severe ? Well, compared to other blotter spot samples here, it's more serious or extensive.
However looking at its contaminant levels in centre and intermediate zones, I would interpret the fuel dilution as not detrimental to the continuing service of this oil sample at 740 km 20 hour track time.
By the way, what's OEM recommendation on oil change interval in km or hour track time ?
The virgin KV100C of this Delvac MX 15W40 is 15.5 cSt, and it may have dropped by as much as up to 20% as a result of fuel dilution. However the blotter spot indicates acceptable level of contaminants (with capacity to absorb more contaminants) , hence personally I won't be replacing this used oil.
Heck, I have zero experience on motorcycle oil thing btw.
OEM recommendation is 5000km intervals.
I changed out my used oil already because I was worried. I was going to run for 1800km initially. Anyways Mobil Delvac MX is only RM11 per liter and my motorcycle only takes 1.6 liter.
I'll take a sample again after next trackday to monitor again. Thanks zeng
This post has been edited by e-lite: Jun 18 2018, 04:39 PM
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