Hi All

This is my test in my KTM RC390 motorcycle fuel injected. The oil is Mobil Delvac MX only has 740km track time or 20 hours on it.

Is my blotter test worrying as I suspect severe fuel dilution in oil. I can smell fuel in the oil also

This post has been edited by e-lite: Jun 16 2018, 12:14 PM


Attached thumbnail(s)

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.

This post has been edited by zeng: Jun 18 2018, 03:03 PM

Thanks for your response. I fully agree with you. As the oil mileage is only 740km, soot levels/blackness is acceptable.

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

Dear zeng,
Appreciate your opinion on this 48-hr blotter spot image. Thank you.

Car make: Nissan AD RESORT 1.6L (Carburetor)
Engine oil: Petro-Canada Duron SHP 15w40
Oil mileage: 11,145 km
Engine total mileage : 295,388 km
Driving condition: 90% stop-go , 4-5 times engine on/off daily

Hi chemistry,
This 48 hr blotter spot has a very large centre zone , but without a clear ,dark-coloured perimeter ring around the centre zone (which is a good news) indicating a very potent or strong dispersancy (and detergency) capability typical of a modern HDEO diesel oil.
Btw, this PC Duron SHP 15W40 is a semi-synthetic HDEO with ultra high specifications in CK4,E9, ECF-3, other than dual rated SN.
The rather grey colour of the centre zone indicates quite an amount of combustion by-products and contaminants etc in this 11,145 km used oil sample from a carburrettor old tech engine.
The intermediate diffusion zone is good and clear.
However, I find it interesting for being unable to 'see' the outermost transparent zone surrounding the jagged edges, indicating near zero fuel dilution despite your claim of 90% stop & go traffic condition.
It appears to me this engine is very well maintained.
This used oil sample appears to be serviceable for probably another 1500-3000 km , IMHO or speculation.

Dear Zeng,
Many thanks for your detailed explanation. This engine has been using Duron semi synthetic for at least 5 times (each interval 10-15k km) so I suppose I treat it not bad haha, meanwhile many other AD RESORT owners already start using mineral oil with 5k interval practice.
Good to know that fuel dilution is not present (or negligible perhaps).
The engine is still running strong and quiet despite fuel consumption at the high side caused by frequent start-stop and stop-go as well as "nature" of a carburetor. I could not ask for more, really.

Engine oil :Shell Helix Ultra 5W40
Car make: Avanza 1.3 K3VE
Oil mileage: 5575 km
Engine total mileage : 267,960 km
Driving condition: 50% stop-go , 50% hiway
48 hr blotter spot.

looks great.

Absence of centre zone perimeter ring, yep it looks good and 10000 km blotter spot should be coming soon.

Giant 1-day Promo :Shell Helix Ultra Fully Synthetic 5W40 at RM 84.44/4L.



Note:With powerful OEM specs,


This post has been edited by zeng: Aug 11 2018, 06:06 PM

Oh..whole of malaysia?

West Malaysia, I suppose.
Maybe others can testify so ......

10099 km blotter spot, Helix Ultra 5W40


...... and going ....

This post has been edited by zeng: Aug 15 2018, 03:22 PM

Will it be okay to switch from 5w30 to 5w40?

Since the last used of the Pennzoil oil are good, i've prolong the oil change.
Hope this blotter will be a good indication for all.
Oil sample taken cold.

EO: Pennzoil Platinum Velocity 5w-40
Car: Perodua 2014
Engine: 1.3 auto
Millage: 17000 km
Odometer: 86132
Driving Condition: 60% City; 40% Highway



Attached thumbnail(s)

73 hrs boltter

EO: Pennzoil Platinum Velocity 5w-40
Car: Perodua 2014
Engine: 1.3 auto
Millage: 17000 km
Odometer: 86132
Driving Condition: 60% City; 40% Highway


Attached thumbnail(s)

Bardahl MXP 5W-40 FS
180,020 km mileage
6,829 km usage
Livina 1.6 NA
Photo at 48 hours

Update:

Car make: Nissan AD RESORT 1.6L (Carburetor)
Engine oil: Petro-Canada Duron SHP 15w40
Oil mileage: 12,558 km
Engine total mileage : 296801 km
Driving condition: 90% stop-go , 4-5 times engine on/off daily



@zeng : Appreciate your review on this 72-hour blotter spot. Anyway, I am changing the oil in a few days.

Wondering where is ts?
Calling zeng

It would be great if there is an inclusion of duration of engine oil used like for how many months. (Y)