Viscosity test @home

[Hurky]

Hello everybody, this is my first post at this forum so I will start with an experiment I've done... I live in Spain and here the used oil analysis don't seem to be something normal, I don't know any company that make oil analysis here, sure there are some but I also don't want to spend the money of a few oil changes so I prefer to change it relativity often in compare to what others do in my riding group...

My bike is a Yamaha WR450F'08 and I use Mobil Delvac MX 15W40 mineral HDEO oil, by what I've read so far this should be good stuff... My riding style is enduro, mostly slow stuff with some trial in first gear.. Most of the time 1/3 to 1/2 gas used.. SO it is far from "wide open"

I was wondering if I could by some manners test myself in a very easy way if the oil lost some of the viscosity after time, but this test is only practical at low temps so I suppose I can only measure viscosity lost by fuel dilution and not by VI shear-down as this is only(?) noticeable at operation temperatures I think...

So here we go, these were all of the new oils I've lying around for estimating different viscosity’s, the red ones are the used Delvac oils, the 2h one was the oil used for brake-in and the other two was at standard 20h changes:



So, what do you think ? Is this test somewhat useful estimating viscosity loss or is it completely useless ?

Thanks !

 

[CATERHAM]

First, welcome to BITOG!

I can't see what you've apparently posted.
Anyway there is a very easy way to measure the operational viscosity of the oil in your engine (that's what you really want to know) and that is to install an oil pressure gauge. Yes they have them for bikes as well for cars and trucks.

 

[Hurky]

The graphic is only shown correctly at fullsceen... but here is the original table:

I already have an 0,40 bar oil pressure sensor, the problem is that my motor only have an easy access port for the sensor in the upper portion of the motor, the oil line before the cam shafts and there is very little pressure left to measure. I have this sensor to notice a bigger problem like oil-loss or an problem with the oil pump...

Thanks

 

[rrounds]

Thats one way to tell which oil is thinner than another(at room temp.).

ROD

 

[Hurky]

Originally Posted By: rrounds
Thats one way to tell which oil is thinner than another(at room temp.).

ROD
Yes but, why this huge viscosity loss at room temp after just 2 hours of use ?
Can this be VI sheardown ? I thought this would only be measurable at 100ºC
So it must be (fuel) dilution then ?

THanks !