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View Full Version : what happen when you overfill engine oil?



TFBoy
26-05-2006, 02:27 PM
i thought i check my oil etc after 2-3 month not looking at it, and my engine oil was very low, below the lower marking (of the 2 markings) of my dipstick, so i thought yeah i will put 2 litres in. :shock: however now i check it its a bit more than full, so wondering what kind of problems and solutions i will have.

btw the service is a month away, so if i can last until then...
(also notice a quite bit of build up of oil smudge on the front LHS of my engine cover)

also is it ok to put castrol gt3 oil into gt2?

kirky
26-05-2006, 02:43 PM
a little bit over shouldn't be a hassle.

in my younger days i once thought that one bottle of oil = 1 refill.

5 litres in a gemini isn't good.

that was about a week before i got a new car

TFBoy
26-05-2006, 02:48 PM
thnx for the replies guys
(good that amc now back online settles problems and worries so quick and easy!) lol

43mma
26-05-2006, 03:03 PM
thank god im not the only one who does it but when i got my 1st car i toped the oil up untill i could see it from the top of the engine not on the dip stick:confused:

Joukowski
26-05-2006, 03:16 PM
to your other question, you can mix engine oils. Its not optimum because you won't want old oil to mix with new, but they're all designed to mix with each other across brands and grades so you can stop at any service station in an emergency to top up.

BirdManVRX
26-05-2006, 04:47 PM
Can you mix synthetic and non-synthetic oil? I have about 2-3 litres of each. Shame to throw them out when if I can mix them I will have enough for an oil change.

Fred Nurk
28-05-2006, 08:32 AM
You should check this with the appropriate manual for your vehicle, but a general rule that most manufacturers adhere to is this: 1L between the two dipstick markings on the dipstick.

That is to say, if your oil level is sitting on the low marking on the dipstick, you'll need 1L to bring it up to the full level on the dipstick.

Personally, I always check the oil when the engine is cold, and its parked on a level surface (my garage). This way, all the oil is always in the sump, and you don't get false readings from taking a reading just after the engine is running, and theres still oil returning to the sump.

KING EGO
28-05-2006, 08:41 AM
As long as you are only a little over full.. How far up the dipstick is it over.. i few millimetres of is it centremetres over full..?????


Over filling your engine can be really bad.. just depends how over full..?:)

Nick
28-05-2006, 08:50 AM
From what i've seen, going over full - within reason - isn't the end of the world, you'll just have power leeching occouring from parts getting really belted with oil instead of the appropriate amount, which will slow it all down, and i've been told over full oil gets consumed by the engine, aka burnt, which i think is a bit of a lie.

KING EGO
28-05-2006, 08:52 AM
From what i've seen, going over full - within reason - isn't the end of the world, you'll just have power leeching occouring from parts getting really belted with oil instead of the appropriate amount, which will slow it all down, and i've been told over full oil gets consumed by the engine, aka burnt, which i think is a bit of a lie.


little over is fine.. to much over is bad.. oil pressure problems and kill engine.. dont know the technicals damage it does but its bad..:)

manifesto
28-05-2006, 08:56 AM
and i've been told over full oil gets consumed by the engine, aka burnt, which i think is a bit of a lie.

negative!

overfull engines do burn it, but it has to be really full! wen my mate got his 1st car he could almost see the oil from the top. took it for a drive and it looked like he was doing burnouts the whole time (sept with black smoke pouring out his xhaust) :nuts:

Nexus
28-05-2006, 09:11 AM
There is a reason why the dip stick is there and why I gave a list of all recommended engine oil thread with the RIGHT amount to pour into the engine for every Magna listed which MANY till now do not read or fall on death ears.

Regarding mixing oils, is possible but will not give optimum and good performance. do a drain, flush and replace with a grade you want to use.

SteveTJ
28-05-2006, 09:15 AM
Too much over can cause oil leaks, more pressure against the seals.
I used to have an R31 Skyline- it had no oil leaks, but it did have the right amount of oil in it.
One day I was helping a mate change his gearbox in his Alfa and it was getting dark as we finished so I started the car up to run the headlights, only thing was the driveway my car was on was really steep- near 45 deg. Only ran it for 5 or 10 mins and from then on it had an oil leak from the rear crank seal. All the oil must have been sitting against the rear seal and worked its way through.
I know magna engines aren't north/south but most cars don't have a lot of tolerance for too much oil. I would be extra careful if your engines done a lot of kms because the seals won't be at their best anymore.
Unless of course you have one of the early Holden/Corvette LS1's where they recommended you put an extra litre of oil in if you were driving hard, so it didn't suffer oil starvation on corners!

danthevrxman
28-05-2006, 09:27 AM
At my last service i had my car overfilled by mitsi by about half a cm over full, called them and they said don't worry it'll be fine, they said only if it's like an inch over full then they do need to pull it out.

Joukowski
28-05-2006, 05:42 PM
Can you mix synthetic and non-synthetic oil? I have about 2-3 litres of each. Shame to throw them out when if I can mix them I will have enough for an oil change.

Yes you can, but it's not best practice as i'm quite comfortable running synthetic oils up to 25000km or so before changing, for mineral oils, i wouldn't dare go beyond 10000km.

TFBoy
28-05-2006, 07:45 PM
my level was below the low on the dipstick, so i put in 2 ltrs, which means im about a bit under 1 litre over :doubt: , service is in like 2-3 weeks, so hopefully it will last without any problems or damages till then

The_Monk
28-05-2006, 08:35 PM
When i got my current car the engine bay was nearly but the next day was black. Oil had been majorly overfilled and it blew most of the gaskets+seals, also heaps of blue smoke poured from the exhaust.

johnmar
01-06-2006, 01:02 PM
Overfilling also promotes leaking from gaskets. Its also not adviseable to mix synthetic and mineral based oils. Properties are totally different and if mixed can promote oil burn/usage.