I'm an idiot, Auto trans oil into sump.. - Kawasaki KLR 650 Forum
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post #1 of 20 Old 03-26-2020, 07:19 AM Thread Starter
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I'm an idiot, Auto trans oil into sump..

Hello guys

As stated in the title, I'm and idiot. I won't go into to many details about the why, but you can ask..

Today I drained the old engine oil out of my motorcycle. I then accidently poured about a litre of Automatic transmission fluid into the bike before I realised my mistake. I removed the drain plug and drained the fluid for about two hours.

I then topped the bike back up with engine oil. I ran the engine for a few minutes. I viewed the oil through the glass window in the crank case. There seemed to be tiny bubbles in the oil. I was viewing the oil at night with a bright torch. Perhaps the bubbles are normal, but can't be seen in normal daylight conditions, perhaps the oil is contaminated.

I have contacted the manufacturer of the fluid and oil. They are the same manufacturer, and the containers look very similar. I will get back to the forum if they reply

Does anyone have any advice? About the oil I mean, not about reading the label first....

Last edited by timberfoot; 03-26-2020 at 07:23 AM.
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post #2 of 20 Old 03-26-2020, 08:09 AM
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If it was my bike I would climb on and ride. The little bubbles are normal.
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post #3 of 20 Old 03-26-2020, 10:05 AM
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Klrian is correct, totally Normal. It will do that every time, the cold oil is simply aerated.

Grab a bottle of oil, shampoo or syrup & shake the heck out of it, pour some into a glass & have a look. Know imagine a 1300rpm paint shaker.

Fully warmed oil will release the air quicker.

The ATF is a high detergent oil, what little is left inside will do no harm. Run it like normal to your next oil change.
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post #4 of 20 Old 03-26-2020, 10:43 AM
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Ride it.

The feeling of the wind in your face can lift your heart.
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post #5 of 20 Old 03-26-2020, 11:57 PM Thread Starter
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Thanks for the replies guys
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post #6 of 20 Old 03-27-2020, 04:22 AM Thread Starter
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Hello again

I did suspect that the bubbles were normal, I just need a little back up.

I feel much better about it all now

Thanks again for the replies
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post #7 of 20 Old 03-27-2020, 09:11 AM
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Actually-----------

An old mechanic trick from LONG ago for sticky lifters. They'd warm up the engine, drain the oil, fill it with ATF, then drive around the block a couple of times.
Saw one guy do it one time, and it was amazing what the ATF looked like when he drained it. It cleaned so much sludge out of that old engine, and the lifters were quiet!

Thought of that the first time I saw 0W5 oil on the shelf for some of these new cars.


Good catch, always use the recommended weight oil in your rig.

Confidence is the feeling you have before you fully understand the situation."

Jeff in Napa California
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post #8 of 20 Old 03-27-2020, 08:11 PM Thread Starter
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I have heard that people add ATF to engines to clean them up a bit.

My limited understanding of oils is that modern oils contain detergents that do pretty much that same job. Also, I have heard somewhere that ATF is a highly friction modified fluid. This is not something I know, just what I've heard. The Clymer motorcycle manual warns against the use of friction modified oils in a wet clutch system.



I don't want to start a thing, so I'll point out that members of this forum have written that they have had no problems using friction modified oils.
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post #9 of 20 Old 03-28-2020, 09:33 AM
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I'll say the friction modifiers for oils can be towards either direction, as Automatic Transmissions have multiple wet clutches inside them.

All is well Timberfoot, always best to have the correct stuff inside.

Be safe - Ride safe.

pdwestman
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post #10 of 20 Old 03-28-2020, 04:56 PM Thread Starter
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Thanks Paul
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