I park my Sierra Cosworth 4x4 into my garage. After 3 days i check motor oil level and it was too low. After 7-8 days car in garage i check oil level and it was increase to normal level.Why my oil drop too slowly ?
I check this several times and every time the oil level increase if i dont drive the car and dont start the engine 8-10 days

 

The oil drains back down from the head and followers etc.

 

what should i do ? i cant understand from your post what is damaged on my engine

 

dont htink anything is damaged as it usually takes a while for the oil to drain through all the components at the top of the engine to the bottom

 

The cylinder head and its components hold lots of oil back and takes ages to drain down to the sump, this is normal !

Its always best to check the oil in the car when its cold on a level surface of course as it is easy to overfill the engine.

 

i think that it is normal 1 - 2 days motor oil to drop to oil sump. I cant understand why my oil drops too slowly?

 

I guess it depends what oil type you have in the engine and the ambient temperature !
I would imagine its quite cold out there in Bulgaria ??

 

Because all of the oil retained in the head takes a long time to drain though tiny holes..... You should run a cossie about 2-3mm below the max mark on the dipstick, prevents excessive breather losses and allows for a bit of drain-down. Don't worry about it, if it was using excessive amounts, or the oil level was rising, then it would be time to worry

 

as what will has said - your oil could be too thick.

 

m8, my oil is rising after 7 days only if i dont start the engine. I check it after 1 day engine off and it is on the minimum , after 7 days engine off the oil rise with 5-6mm.

 

Thats ok, if it was rising a lot during normal use, then it means fuel is getting into the oil, normally due to borewash/overfuelling.

 

what oil are u using sounds like its realy thick to take that long

 

now 15w50, but before 0w40 and it had the same problem so i exclude this is the problem

 

i would run castrol edge 10w/60 15/50 a bit thick i think

 

Reviving an ancient post perhaps someone can shed some light. Have exactly the same issue as the OP and it doesn't seem right to me. It takes a week for the oil to go back to its original level! Any other thoughts? Strangely enough, if I top up the oil, it shows on the dipstick almost immediately.

 

What grade of oil you running? OP was running 15w50 which is very thick when cold so will be harder to run through small oilways

 

Engine oil level should be checked after the engine has run, if you use this rule "check engine oil level every time you fill up with petrol". your oil level should be at the upper level when checked.Waiting days for the engine oil to drain back is not the way to check the level.

 

I agree with you on this, been around cars for a long time and never heard of anything so stupid as waiting days so you can get the "accurate" oil level!!!
My oil level on my 2wd Saff never fluctuates and is always up to the correct level.

 

Well if I don't wait for days, I'll find it low. If I wait, it goes back to the correct level (?). I know it's not normal, which is why I'm asking!

 

Just re-read my post no. 17, your oil level should be near the max level after the engine has run. If you check the oil level every time you fill up with petrol the oil will be hot and have expanded, the level should be set to around the max never above. If you follow this method you will never be caught out with low oil level and oil surge issues

 

Your climate in Malta is a lot warmer than it is here in the UK so the oil you use
( what oil do you use? ) should never have an issue with it taking a long time to run back down into your sump.If your engine/turbo is in tip top condition and you fill it with the correct amount of oil it should not be using oil and the level should stay the same. I have never heard of this problem that you have and there does not seem to be a logical reason for it to happen. Check the oil level before you take the car out and there is no reason why when you check it again it will be different. An engine can only use oil through valve guide seals, worn piston rings, turbo oil seals or actual oil leaks. If your engine has none of these issues the oil level should not change.

 

My 4x4 also has the 'problem' that it takes a lot of time for the oil to drain back to the sump. I don't know why this is, but it can take a few days before the oil level is stable.

 

So why does Ford state in the owners book that the cosworth engine uses 1.75 pints per 1000km even when new dependant on use...

The only thing which could change the level would be a breather system that is filling up in use and then draining back to sump but for that to happen it would have to be installed incorrectly.

 

How does the oil drain back from the head to the sump on a YB? My BOA has a timing chain where it is completely open where the oil can flow back and it has a drain hose from each head to the sump. But the YB doesn't have a timing chain in oil or a hose back to the sump (as far as I know).

 

Via a 20mm hole in the rear of head and block.
high performance pinto's back in the day had twin braided lines fitted from head to sump.

 

There are two anti-drain back valves in the Yb engines lubrication system, one is in the oil filter the other is in the cylinder heads main oil supply gallery. Typically if these are faulty and allowing the oil to drain back you will notice a delay in the oil pressure rising on startup and tappet noise/ big end rumble until the oil has refilled the filter and galleries etc and normal pressure has been reached.
You need to set the oil level after the engine's lubrication system has been primed.
If you suspect there may be a drain back issue with aftermarket breathers and modifications and you have no idea how much oil is actually in the engine it may be wise to drain the oil and refill it with the correct quantity and then re asses

 

Tony you are talking about the pressure side and one of the drain backs being the small ball bearing in the head? If so then if this ball is stuck in the open position and allowing oil up to the head it will also allow it to drain back which could be an expensive failure.
Also oil pressure build up on gauge would depend on many factors oil grade or using a high pressure pump etc.
I wonder if he has a oil cooler ?

Paul

 

I can only tell you that I have never had any issues with using oil. The only time I have needed to top it up in between oil changes is after a long fast drive of hundreds of miles.

 

I'm sure I've heard people say only fill a cossie up with oil so that it reads half way up the dipstick.

 

If your running it first then taking a measure a lot of oil will be through the system so its either half way up the dips tick when warm or completely full on cold. If it's full on the dips tick after a run then it's over full when cold. Drain it and put in the stated amount and see where it lands. Check it under the same condition to keep an accurate measure.

 

Yes I have also heard this 🤔

 

Half way up the dips tick when warm or cold......? I'd pour in the stated amount and it ends up were in ends up?

 

If the correct amount of oil has been put in, it can only ever need maybe a slight top up it cant make extra oil all by itself. I have had my 2wd Saff for 23 years and never had any oil level problems so is this something that just happens with the 4X4 Saff?