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Mileage versus oil color. How fast does oil turn black?

 
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scootERIK
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Joined: 12 Jul 2012
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Location: Lake Geneva, WI
Buddy 125

PostPosted: Sat Apr 04, 2020 6:37 pm    Post subject: Mileage versus oil color. How fast does oil turn black? Reply with quote

I decided to do a little research project for the next ~1,500 miles to see how the oil in my Buddy 125 changes color. I will be taking a picture of the oil every 100 miles plus every 250 miles. I am correcting for the inaccuracy in the odometer since mine is off by about 10%. Also, these are not exact miles but they are pretty close.

Background info-
2009 Buddy 125 stock except for a 95 main jet in the carb and 11g rollers.
Engine has ~14,000 miles on it.
I didn't change the oil filter on this oil change.
Oil is Shell Rotella T4 15w-40
Running 87 octane gas
Riding is a mix of WOT as well as 35-45 mph cruising, not too much stop-n-go riding.
I added some oil at 2100 miles.
Most of these miles were done when it was 45 to 70 degrees.






















900 actual miles equals 1000 miles on the odometer





































To Be Continued...


Last edited by scootERIK on Sat May 23, 2020 3:52 am; edited 12 times in total
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babblefish
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Location: San Francisco
2006 Blur 180, 2008 Buddy St. Tropez

PostPosted: Sat Apr 04, 2020 8:49 pm    Post subject: Reply with quote

I'm kinda curious myself, great idea, thanks for doing it.
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GregsBuddy
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PostPosted: Sun Apr 05, 2020 4:01 pm    Post subject: Reply with quote

I noticed that my oil was darkening sooner a few oil changes before the piston failed.
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babblefish
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2006 Blur 180, 2008 Buddy St. Tropez

PostPosted: Sun Apr 05, 2020 8:32 pm    Post subject: Reply with quote

GregsBuddy wrote:
I noticed that my oil was darkening sooner a few oil changes before the piston failed.


Probably due to blow-by pass the rings from the combustion chamber. Good to know though. I'll have to keep an eye on my oil because I ride my Buddy a lot.

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fried okra
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PostPosted: Sun Apr 05, 2020 9:14 pm    Post subject: Reply with quote

My 2019 Buddy 125 is stock jetting. Doesn't seem to run lean at all though.

How does the #95 main jet work for you?

fried okra
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scootERIK
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Location: Lake Geneva, WI
Buddy 125

PostPosted: Mon Apr 06, 2020 12:22 am    Post subject: Reply with quote

fried okra wrote:
My 2019 Buddy 125 is stock jetting. Doesn't seem to run lean at all though.

How does the #95 main jet work for you?

fried okra


My Buddies have always been a little bit on the lean side. Mine had a #92 originally so the #95 isn't really a big change. I did get a little more color on the spark plug so I think it helped. Just going by feel the #92 made a touch more power.

I believe my MPG went a little. When it's cold and I do a lot WOT it seems to really go down. I am at about 875 feet above sea level.
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GregsBuddy
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PostPosted: Mon Apr 06, 2020 4:23 pm    Post subject: Reply with quote

Babblefish. Agreed, I think combustion gasses leaking passed the rings was the issue with oil darkening. The new rings/piston/cylinder are breaking in well and I look forward to being able to ride the scoot' a bit faster soon. I can feel the extra power even with partial throttle during break in.
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scootERIK
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PostPosted: Sat Apr 11, 2020 9:18 pm    Post subject: Reply with quote

750 miles in and it looks like the oil is starting to get a little darker.
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babblefish
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2006 Blur 180, 2008 Buddy St. Tropez

PostPosted: Sun Apr 12, 2020 12:33 am    Post subject: Reply with quote

The rings in my Buddy must be worn out because my oil is pretty black at less than 100 miles. Ah well, I've got a brand new BBK, A12 cam, and a ported and polished head sitting on the shelf looking for a home.
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scootERIK
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Buddy 125

PostPosted: Mon Apr 20, 2020 9:12 pm    Post subject: 1000 miles in Reply with quote

When taking pictures of dirty oil lighting can make a big difference on color. Also, it is easier to see the color of the oil when the oil is cold because it sticks to the dipstick better.

At 1000 miles in the oil is still looking good.

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babblefish
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PostPosted: Mon Apr 20, 2020 9:43 pm    Post subject: Reply with quote

Your oil at 1000 miles looks like my oil at 50 miles. Lol.
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GregsBuddy
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PostPosted: Mon Apr 20, 2020 9:48 pm    Post subject: Reply with quote

If you drained and looked at it now, it would seem quite dirty but would probably be fine.
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scootERIK
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Location: Lake Geneva, WI
Buddy 125

PostPosted: Tue Apr 21, 2020 12:54 am    Post subject: Reply with quote

babblefish wrote:
Your oil at 1000 miles looks like my oil at 50 miles. Lol.


When my first engine was dying it would get pretty black within 300 miles, and most of the time I was extra gentle on it, no full throttle and I kept it under 45 mph. I was changing the oil every 500-800 miles just trying to keep the engine alive.
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scootERIK
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PostPosted: Sat May 09, 2020 4:03 am    Post subject: Reply with quote

Just got to 2,000 miles on the odometer(around 1,800 actual miles) and the oil is still looking pretty good. If I wasn't doing this test I would have changed the a few hundred miles ago.

Also, I haven't added any oil. I normally have to add a little oil every few hundred miles to keep it topped off. I guess that I might have been keeping the oil slightly overfilled. I might have to add a little depending how long I go before I change the oil

This is the oil at 2,000 miles on the odometer. The oil is cold so it stays on the dipstick.

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BayStateScooterist
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Joined: 14 Oct 2019
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Location: Central Mass
2009 Buddy 150 Italia, 2019 Buddy 125 Turquoise

PostPosted: Sat May 09, 2020 3:37 pm    Post subject: Reply with quote

scootERIK wrote:
Just got to 2,000 miles on the odometer(around 1,800 actual miles) and the oil is still looking pretty good. If I wasn't doing this test I would have changed the a few hundred miles ago.

Also, I haven't added any oil. I normally have to add a little oil every few hundred miles to keep it topped off. I guess that I might have been keeping the oil slightly overfilled. I might have to add a little depending how long I go before I change the oil

This is the oil at 2,000 miles on the odometer. The oil is cold so it stays on the dipstick.



Not much difference from your 1000 mile pix. Are you changing your oil now?
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scootERIK
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Location: Lake Geneva, WI
Buddy 125

PostPosted: Sat May 09, 2020 4:11 pm    Post subject: Reply with quote

BayStateScooterist wrote:
Not much difference from your 1000 mile pix. Are you changing your oil now?


I am going to go at least another 200 miles. But I am thinking I might push it to 2,500 miles just to see what happens to the color. As of right now the oil looks like it is still in good condition(at least in my opinion.)

Normally I would change it due to the miles. Usually once I get over 1,200-1,500 miles on my oil I will change it if I am planning to do a long ride because I believe long fast rides are harder on oil than shorter slow rides. So far on this oil the longest day was about 100 miles. I probably change my oil more often than I need to but it's cheap and it can't hurt.
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scootERIK
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Location: Lake Geneva, WI
Buddy 125

PostPosted: Sat May 23, 2020 4:03 am    Post subject: Reply with quote

Up to 2,500 miles on the odometer. I did add some oil a few hundred miles ago because the oil level was getting a little low.

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JettaKnight
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Series Italia 161

PostPosted: Mon May 25, 2020 2:52 am    Post subject: Reply with quote

babblefish wrote:
Your oil at 1000 miles looks like my oil at 50 miles. Lol.


IKR!

I checked my oil after riding to work - quite dark already.

And I change every 100 miles, so... I guess this thread is interesting.
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