Oil Color
Maybe its me. On MIata.net in the FI section someone asked if it was okay that his oil was black when he did a change. Here was Tom@FFS reply
"My engine only has 135,000 miles so it is relatively low miles and I am only running 15PSI+ but, after 3000 miles, the oil is still honey colored. If yours is turning black after a couple hundred miles, I would guess you are having blow by past the rings. A quick leak down check will confirm." __________________ Install Kit. Turn Key. Enjoy. Fast Forward Superchargers 480-993-5105 E-Mail Is it me or is this guy fucked up. Jesus my oil was black berfore the turbo. Maybe the engines all fucked up and I havent noticed it in the last 40 k miles |
Sounds pretty close to me.
My motor has around 180k miles on it, after 6000 miles with Mobile1 its still honey colored. I have very low leakdown. Friends motor has very high leakdown (like 60+%) after about 60 miles his oil turns black and smells like gasoline. |
Combustion gasses blowing by the rings and getting into the oil will discolor it.
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Originally Posted by elesjuan
(Post 194626)
Sounds pretty close to me.
My motor has around 180k miles on it, after 6000 miles with Mobile1 its still honey colored. I have very low leakdown. Friends motor has very high leakdown (like 60+%) after about 60 miles his oil turns black and smells like gasoline. |
That would be fuel by passing your rings. Which can be caused by cylinder wash from running too rich.
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Hold on. Shouldn't the first question be, "How long has it been between oil changes?"
Now, provided the interval is within a reasonable range (and is a consistant habit), then I would look at other culprits for color change... - L |
Originally Posted by cjernigan
(Post 194648)
That would be fuel by passing your rings. Which can be caused by cylinder wash from running too rich.
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Yeah. Ring wash is not a good thing. Why don't you have a wideband O2 sensor? You need to run a different disc in the vortec maybe in order to decrease the amount of fuel you're running.
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Originally Posted by l_bader
(Post 194649)
Hold on. Shouldn't the first question be, "How long has it been between oil changes?"
Now, provided the interval is within a reasonable range (and is a consistant habit), then I would look at other culprits for color change... - L |
Originally Posted by cjernigan
(Post 194656)
Yeah. Ring wash is not a good thing. Why don't you have a wideband O2 sensor? You need to run a different disc in the vortec maybe in order to decrease the amount of fuel you're running.
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i've read numerous times that oil color has nothing to do with oil quality.
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Originally Posted by Mach929
(Post 194666)
i've read numerous times that oil color has nothing to do with oil quality.
Just because you've put 3 or 5k miles on oil doesn't mean its done.
Originally Posted by cjernigan
(Post 194648)
That would be fuel by passing your rings. Which can be caused by cylinder wash from running too rich.
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Originally Posted by gman3
(Post 194653)
Well I also have the black bumper to prove the running rich theory
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Shitty, my oil gets black quickly and smells of fuel (not to strongly but I don’t remember it smelling of gas before) …the engine is stock and has ~80k on it and while I was at the glen would run at 7-7.6k for 20 minutes at a time. The shop that sets and techs the car for track days (also sets up spec and track miatas as well as other race/track cars) feels my car is down on power. Guess I should do a rebuild before slapping a turbo on.
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Originally Posted by ldp82
(Post 194717)
Shitty, my oil gets black quickly and smells of fuel (not to strongly but I don’t remember it smelling of gas before) …the engine is stock and has ~80k on it and while I was at the glen would run at 7-7.6k for 20 minutes at a time. The shop that sets and techs the car for track days (also sets up spec and track miatas as well as other race/track cars) feels my car is down on power. Guess I should do a rebuild before slapping a turbo on.
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ya but if i have a "fun" blow out at the track its apparently bad form to take out half the pack, some you collect with the now spinning car as the rear wheels lock when the motor seizes and the rest get to find your oil slick and spin in to you and your new buddies you just took into the wall with you a few seconds before
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yes, causing the "british car flag" to come out is generally a bad thing. maybe I'm just a noob, but I don't see how a seized engine would drop oil. you'd want a snapped rod to do that properly. a turbo will help you get there.
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as for the smelling of fuel, just pull the dipstick and put a flame to it. If it lights, you have blowby!
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Originally Posted by thebeerbaron
(Post 194741)
yes, causing the "british car flag" to come out is generally a bad thing. maybe I'm just a noob, but I don't see how a seized engine would drop oil. you'd want a snapped rod to do that properly. a turbo will help you get there.
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Originally Posted by thebeerbaron
(Post 194741)
yes, causing the "british car flag" to come out is generally a bad thing. maybe I'm just a noob, but I don't see how a seized engine would drop oil. you'd want a snapped rod to do that properly. a turbo will help you get there.
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