| Blow-by questions... - Click HERE for Original Thread |
| AdamP |
S13 redtop...
96,000km... changed the oil with a mineral 10W30.
100,000km... changed the oil... mineral oil was brown but smelled fine. Put in for the first time some ELF Excellium 5W40 full-synthetic.
104,000km... ELF Excellium comes out: brown and smells like gas.
-I overfilled the ELF synthetic by about 600-700mL or so (did the change at night so I couldn't see the dipstick well). The SR20DET calls for about 3.8L so ~4L is good. I put in about 4.5L... (probably excess oil pressure)
-The synthetic oil was dark brown after... I suppose the explanation for this is that all of the sludge in the motor is that was the synthetic is highly detergent
-I am running an atmospheric vent so the cylinders run momentarily rich (which can result in some of the gas seeping down into the sump)...
-The car was NEVER smoking / never consumed any oil so I don't believe the rings to be that poor
-Car pulls hard
How viable are some of these points... ultimately I'm going to get a compression test done sometime later this week but I'd like a little bit of insight into this...
I put in Castrol GTX (regular dino oil) 10W40 today... I'll run that for a little while (1000-2000km) and see how clean (color/smell) it runs. Valvetrain seems to run a little quieter than with the synthetic. |
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| T-LAV MRV |
switching back and worth from synth to reg oil can be detrimental to the engine, once u run synth, stick to synth.
mike |
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| chris f |
| What? the army tought you that right? makes no diffrance at all, sounda like you over fueling the engine, look at the time like it was good when it was colder out, when it got warmer you mash the gas a little more often. |
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| Sxn |
| did you do an engine flush? |
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| anschutz_93 |
| why are you running a 10w anyway? a 5w gives better lubercation when your engine is cold and is better for not clogging up between tight clearances. as for your question if your running really rich some times gases/vapours can get into your oil and cause it to thin out a bit (looking at your post you already knew this tho...) overfilling by .5L isnt any thing to worry about it will just sit in your oil pan and will increase oil pressure minimally when your driving very hard...anyway gl |
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| chris f |
| extra oil when your driving hard? where do you guys grt this info? sounds like the same place that tought me how to spell, as you can see its not right. |
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| anschutz_93 |
| when you drive hard the oil pump pushes with more pressure + driving hard creates more heat which causes the oil to expand... |
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| T-LAV MRV |
if u overfill an engine oil it get pushed out of the seals that it shouldn't.
do u have a wideband in your car?, i would investe in one, might be thin oil and rich condition.
mike |
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| chris f |
| there is no seal in you engine that holds oil pressure, none, none at all. nothing. name me one? they all are splash seals, if you over fill you car, by alot. the oil is not aloud to drain back through the head as fast, in turn your pcv system will suck it up in to the intake. |
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| Ayeso |
| oil filter ring seal? |
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| chris f |
| 99.99999% of oil systems in cars pull the oil through the filter, not push it. so its under vaccuume. |
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| Ayeso |
| Howso? Doesn't the oil pump push the oil through the small holes in the filter then out into the engine? |
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| T-LAV MRV |
ever seen an oil filter blow off on a dsm, not a pretty picture.
mike |
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| chris f |
| no, you right. i was thinking fuel systems, im a dummy. you would have your filter o-ring and the o-rings on your pump and feed tubes. but as for anther seal they would not blow out. and when oil gets hot it does expand but the leavel just goes up it dont creat pressure in the engine |
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