some time ago I found out my car ('97 5th gen prelude, 2.0i) was completely drained of oil (Just bought it a month before and there was plenty of oil when I had it checked before buying).
So I filled it up again, and was very relieved that I found out just in time. And losing about 5 litres of oil in a month isn't a good thing, I assumed it was leaking somewhere, although there was no leakage found at the pre-buy check.
But after leaving it standing on a clean concrete floor at work for about 13 hours, but there wasn't a single drop of oil to be found, which pretty much ruled out leakage.
So the other explanation would be that it was using the oil (crooked pistons or someting), but that would mean I would get black or colored exhaust fumes...which is also not the case.
So my question is: what could be a explanation for the fact that my engine uses about 1 litre of oil every 600/700 km?

 

Could be a few things.

A stuck open PCV valve can do it.
Blowby... rings/seals

Try a new PCV and see. I lost a 1/2 a quart in 50 miles.

 

thnx for the tip, giving it a try first thing next week

 

well I checked it, and had it checked but there was nothing wrong with the pcv.
any other suggestions?

 

I don't think you can check it completely. I would replace it. I pulled mine out and cleaned it. It looked good and the valve was moving, but it was still bad.

If it is not dripping then it is getting burned. Rings, or valve seals is my next guess.

 

Do a compression/leakdown test.

For a band-aid fix, try using some thicker oil to slow the consumption down.

 

[QUOTE=smeck]
So the other explanation would be that it was using the oil (crooked pistons or someting), but that would mean I would get black or colored exhaust fumes...which is also not the case.


Burning oil makes BLUE smoke.......BLACK smoke is from too much fuel....good luck

 

im going to guess piston rings...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JOE BD-0 &raquo;</TD></TR><TR><TD CLASS="quote">
Burning oil makes BLUE smoke.......BLACK smoke is from too much fuel....good luck</TD></TR></TABLE>

I know that's why i said colored smoke

and thanks for the suggestions! I'm having it fully checked next week and replace all the possible broken parts, because I want to sell it to partialy finance my h22a type-s swap

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSVTEC 91 Civic &raquo;</TD></TR><TR><TD CLASS="quote">Do a compression/leakdown test.

For a band-aid fix, try using some thicker oil to slow the consumption down.</TD></TR></TABLE>

A compression and leakdown test will not tell you anything about your oil control rings.