how quickly does your fresh oil darken/blacken?

[trevor saxe-coburg-gotha]

Quick question - following an oil and filter change, how quickly does your bike's new oil start to change colour and blacken? Have you ever felt that it's varied by make and model - so e.g. has one of your bike's oil gone mucky quicker than another? If so, what kind of stuff affects this - do twins carbon up quicker? Singles? Do revvy il4s burn the shit off and blast it out of the back?? Is it more to do with the age of the engine i.e. the mileage?
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"Life is a sexually transmitted disease and the mortality rate is one hundred percent."

Mobylette Type 50 ---> Raleigh Grifter ---> Neval Minsk 125

[weasley]

Some is about how much of the old oil gets left behind when you do a change.

Then there is blow-by... a good way to mess the oil up is to have a lot of combustion gases blowing past the piston rings and oxidising the oil, as well as dumping combustion products in it (part-burnt fuel, soot etc).

Oil quality - given the above an oil more resistant to oxidation will last longer and look better. Oxidised oil goes dark and gets thicker. Better base oils resist this.

Oil level and quantity will also affect this... more oil is generally better as there is more to circulate so it circulates less frequently.

I doubt you'll find a common thread across engine types, unless a specific engine is prone to, for example, blow-by or hotspots.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[Howling TerrorOutOfOffice]

I don't know I don't know I don't know in answer to your questions.

The big twin produces darker oil sooner than the big inline 4 and the small single was somewhere in between.
The twin has the dry clutch so less contamination you'd of thought.
Twin has highest mileage then the small single and big il4.
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[talkToTheHat]

when i first had the 535 it would turn fresh oil dark within a few weeks. Motul engine flush made for a filthy change and then less dark oil coming out at changes. but that was a high-mile and old bike

Bandit oil still looks golden. Will likely get changed anyway.
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Bandit. does. everything.

[Robby]

Varies from bike to bike. The main factors affecting it are how much oil you get out from a change - it takes a fairly small amount of old oil to make new oil look dark - and whether or not the bike runs a proper oil filter. If it only has a little mesh then there's nothing catching the very small bits that darken your oil.

It doesn't matter though. The colour of the oil doesn't mean much - look at the oil on an old diesel 50 miles after an oil change. What matter about oil is how long it has been in the engine, and how much work it has done. Doing work wears out oil. Any particulates big enough to be a problem are caught by the filter, anything too small to get caught (like tiny particulates that make it dark) are too small to be a problem.

[Laamapalmu]

If the bike has a wet clutch and it's slipping, it can turn the oil black really fast. But as said varies alot. My bike used to turn it black after 2000km but now as my clutch is slipping it's only 60km.

[skatefreak]

CBR 600 F3 (Inline 4),
oil change every year or so'ish, around 10,000 on the clock, mix of commuting and ragggging.
Oil comes out pretty clean, always fully synthetic in there.

NSR 125 2-stroke, always very clear but sealed from combustion to an extent.

125 4 stroke... Don't think I ever changed the oil

Pug 306 1.9 turbo diesel.
Changed every 4,000 miles.
Comes out thick and pure black.
When I got the car, it came out like corn flower and water... Had to flush that .

Dirty diesels innit.

Would love a diesel motor bike though

[trevor saxe-coburg-gotha]

[Howling TerrorOutOfOffice]

..see my Profile for explanation...Scroll down to tank photo.
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Diabolical homemade music Bandcamp and Soundcloud
Singer songwriter, Artist and allround good bloke Listen to Andrew Susan Johnston here
The Harry Turner Project

[WD Forte]

[Robby]

[Rogerborg]

The Enfield's engine oil (note: engine, the gearbox and primary/clutch are separate) comes out pretty much as clean as it goes in. You could fry a Mars Bar in it.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[MCN]