got 2007 EDM with F20C motor.

i drive it 1-2 times a week and check oil oil level before every driving at morning before startup.

i got it with oil level well avove H letter on dip stick - which is a lot above max level.
oil level disappeared quite quickly at first few hundreds of KMs which mostly was high way driving.

it remained steady during ~500 km of hard montain and x-cross driving and was stabilized at the middle of H letter (which is still above MAX level).

then after 100km of high way and traffic driving it suddenly got lowered to the MAX nothch of the dip stick.

what's going on?
why is it steady at hard driving and disappears at easy/traffic with Air/Con driving?

 

You should not drive any vehicle with the oil filled above the max mark on the dipstick. With the engine running, a good portion of the oil is circulated up into the motors oiling system. The remainder, obviously, stays in the pan. If there is too much oil remaining in the pan, the rotating assy (crank, rods, pistons, etc....) can splash into this as they turn. At high rpm, its like hitting the rotating assy with a hammer every time it splashes into the oil. Honda marked the dipstick at the maximum level you can fill the motor with no contact between moving parts and static oil. They do include a margin of safety for overfill but dont rely on that. Fill it to max only.

With this being said, its difficult to know if your oil loss is "normal". There is no way to know how much oil you have used. From the max mark down to the min mark is 1 quart of oil. Above that or below that, there is no way to actually gauge the amount of oil. Fill it to the max mark and redo your consumption test.

 

now it's exactly at FULL mark.

what's strange to mee - if it's consuming oil why it doesn't do it after x-cross day and hard mountains driving?
i only saw oil level reduced after relaxed high way and traffic driving....

car still has 1 month warranty - if there is a problem i want dealer fix it before it expires!!!

 

Croc, you'll want to document this as carefully as you can if you expect you may ask for warranty work ... especially something as nebulous as "excessive oil consumption."

My experience with the F20C is about zero. However, in general, intermittent excessive oil consumption can often be attributable to a stuck ring ... or several stuck rings. Depending how they are stuck, you may get less consumption with a higher load on the engine than with the engine "loafing" along.

You should also rule out that the oil is leaving the engine through a breather, etc ...

Lastly, what oil are you using? I can't imagine that's the problem ... but I'd like to know anyway.

 

MY'07 F20C2's are not known to consume (a lot of) oil.
I'm not saying your engine does.
So you went from above the "H" to the top "X" in about 700 km?
That's.. what?.. 300ml?
No real problem.
How many km on your engine?

Btw...
Some oils are more volatile than others and that can make a difference.
You may not be consuming oil, it just turns into vapour

 

the car has close to 50,000km.
current oil is 5w40 synthetic - this is what dealers put here (our climate is hot).

i had 2 days in a row of 70% highway + 30% hard driving with ~600-700km in total- oil level remained the same.

after that one day of driving to work ~50km in total 50% traffic and 50% freeway - oil level reduced from middle of H letter to a MAX mark.

since then another 80km of 90% mostly highway driving - it's stable.

i can;t understand this......

"You should also rule out that the oil is leaving the engine through a breather, etc"
did you mean "i shouldn't rule out..."?

 

Croc, most 5W-40s are HDEOs and designed for extraordinarily long drain intervals in long-haul trucks. The should be very stable and not prone to shearing down and/or flashing off.

Yes, it's a turn of phrase that could go both ways, I guess. It is possible that you could be losing oil out a PCV or other breather. My ignorance of the F20C prevents me from giving you a list of the likely suspect points, however.

I haven't been able to determine the patterns of my own F20C yet ... although I change the oil Friday night and it's right up to the full mark right now.

 

i also was thinking about PCV.
especially if oil is overfilled.

maybe i'm wrong - but i was expecting more oil loss via PCV during hard driving/cornering - but it didn't happened....

 

You're well past the break-in @ 50k km

Without knowing the brand / type of 5W-40 it's too early to call it HDEO (Heavy Duty Engine Oil) and it's too early to call it synthetic as well.

Even in a hot climate you don't really need a 40 weight, a true syn xxW-30 will do fine, you'll get more oil flow through the engine at higer revs.

You're over-analyzing your oil consumption

 

LOL

i know it's synthetic because this what Honda use locally for S2000s and it what's stated in mine's all service paperwork...