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Oil Overfilling: What to do?

Hi guys

I overfilled the oil-tank of my Peugeot 607 and drove it around 50 kms to finally noticed it was leaking oil. I checked the dipstick and it was above the maximum.
I also noticed the engine was still quite hot around 20 minutes after turning it off ( this may be due to using the wrong oil and not because of the overfilling)
The oil leaked only while the engine was running and straight afterwards. I didn’t notice any further leaking while it’s been parked.

My main concern now has to do with any damage that the engine may have suffered or could suffer. Would getting rid of the excess of oil be enough? Or should I have a mechanic to check other components that may be affected such as the rear main bearing seal?

Any other advises and suggestions are very welcome

Just exactly how much overfilled is it?? Where on the dipstick is the oil line? 6mm over the full mark? 15mm? 30mm? 6mm is not so much a problem. Everything else is.

Drain out the excess before it destroys your engine. The excess is likely being forced out the dipstick tube. You think you put in the wrong oil (did you read your owners manual, or the oil filler cap that tells you the proper weight oil??) Drain it ALL out and refill the proper amount and then monitor the car to see if the leak goes away. If not, get it in for service.


What was wrong with the oil you used? Regardless, Mustangman is correct that you want to start by putting in the correct amount of the correct oil right away and then work on figuring out the leak.

With emphasis.


First of all thanks a lot for taking the time to answer.

The oil line is at least 2 cms above the line as you can see in the picture below

I just stupidly followed a friend’s advice and ignored the recommendations. I used fully synthetic 10W60 (SN) when the recommended ones are semi-synthetic 10W40, synthetic 5W-40, 0W-30 and 5W-30 (anti-pollution).

I’ll take it to the mechanic tomorrow so they check it.

I haven’t used the car at all since I noticed the overfilling. I guess no further damage can be done if it’s not running, right?

Hey, don’t beat yourself up. We all learn by mistakes.
Sincere best.


haha true, and that’s the best way for me I guess

I suggest that you use the recommended multiweight oils and not the 10W60 used last time.

There’s a good chance just refilling w/the proper oil and amount will cure the leak problem If it doesn’t, and indeed a seal or two could have popped in this situation, deal w/that problem then. Suggest to avoid starting the engine until the current oil issue is resolved. There’s some threads here on useful tips for diy oil changes by the way, if you decide to go that route. The advantage of doing it yourself is , beyond being sure it’s been done right, is you have time while the oil is draining the car jack up to inspect for problems in waiting, like cracked CV joint boots, debris clogging the vents under the windshield, door hinges that need lubing, etc. That kind of preventive inspection can save a lot of money and grief over time.

Thanks for the tip.

Let’s suppose I drain out all the oil, put in the proper one and the leak disappears. Wouldn’t there be a chance of something else being affected? Would the potential oil froth created by the extra pressure just go away when getting the oil level back to normal?

Anything that might be affected has already been affected. Draining and refilling to the proper level will have absolutely no additional affect.

The froth will disappear. Just for the record, it isn’t from pressure, it’s from aeration, just like when you whip up a batter that you’re going to cook. It affects the ability of the pump to be able to maintain a proper pressurized fluid barrier between the bearings and their respective surfaces rather than being caused by pressure. You have the cause and effect reversed. Aeration causes loss of pressure rather than pressure causing aeration.

So there’s no point on going to a mechanic if I drain and replace the oil by myself?

Thanks for the explanation. The patience and clarity that u guys put into this gives some sense to this mistake as I’m learning interesting stuff, I really appreciate it

Try it. If you discover any residual side effects, post back.
If not, post back anyway. We enjoy happy endings.

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That amount of overfill is insignificant, that will not cause leaks. Your engine is probably leaking because of aged seals. I frequently see oil levels an inch (25 cm) over full and drain out a quart, these engines do not leak because of being overfilled.

10W60 is an unusually thick choice in weight, I don’t believe this will cause a leak.

I don’t see any way it could.
I’m inclined to agree that any leakage detected is normal age-related.

One comment in the original post that probably should be explained to the OP is the engine being hot 20 minutes after being shut off. Once the engine is shut off, the fan stops moving cooling air through the engine compartment and the water pump stops moving coolant through the engine. Heat inside the engine, and in the cylinders that routinely exceeds 1,000F sometimes getting much hotter, then moves through the engine’s internals and radiates out the engine’s surfaces heating up the outside of the engine and the surrounding real estate. Remember that this includes the exhaust manifold too. The temperature under the hood rises, and it takes time for it to cool down from there. In short, the engine’s surface and the underhood areas get hotter before they get cooler.

All right! I’ll do it by myself! Already got 3 liters of Shell Helix Ultra 5W-40 (wanted to go for Total as recommended by Peugeot but there’s no seller close to my area)

This is the way I wanted it when I bought the car, to get involved and learn, so let’s go for it.

I assume first I need to locate the oil pan, put a container underneath and unscrew the oil drain plug to let the oil drip. I’ve read that when draining the oil is better to do it with the engine warm to dispose of harmful deposits, but I guess that in this case I’d rather not, right?

I also assume there’s no need to take the oil filter off, right?

Anything else I should do / be aware of?

Correct on all points. Drain cold, have a container that can hold more than you are adding since its overfilled. You can leave the filter on. There should be a washer on the drain plug itself that acts like a gasket on the drain plug made of aluminum, copper, plastic or similar. They are easy to lose in the drain pan in a rush of oil. Don’t assume you just pour in the X liters of oil the manual says it holds. Add X-1 liters and then check the dipstick. Add until full.

Be sure the car is safely supported with jack stands, NOT just the jack the car came with. Spread some paper under the drain pan because some always escapes. Dispose of the waste oil properly…

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Since you’re new to DIYing, I’d recommend that you buy a repair manual before starting. You want to be sure you don’t accidentally drain the wrong fluid.

We don’t have Peugeots around here, so I don’t know what kind of filter this uses, but with filters contained in their own canisters and spun on, you do not want to overtighten the filter. It should be wrist tight only. No filter wrench should be used when tightening. I wear a latex rubber glove, cause my wrists aren’t as strong as they were when I was younger… arthritis has taken its toll.

The same torque warning applies to the drain plug. I have a set of “stubby” wrenches that I use to put the plug back in, to prevent overtightening. Stripped threads are not an uncommon occurrence among newbies… and ham-fisted mechanics that don’t care about their workmanship.

As regards the jack stands, I personally prefer molded ramps, and some vehicles I’ve owned didn’t even need to be elevated to change the oil and filter.

For a drain pan I use a $1 aluminum turkey roasting pan. It has extra capacity, I can easily form a drain spout, and I can just crumple it up and throw it away after doing my oil. No need to store an oil-wetted drain pan.

The OP probably just noticed the engine heat that has always been there because of concern about other matters.
@santinovillo Please dispose of the used oil properly.

I need to get the jack stands first. I guess something like this should do, right?

I’d looked for one but I just found it in russian. There doesn’t seem to be much material my car around the Internet. Even the official handbook contains almost no information regarding mechanical aspects. I’ll keep looking, though I think I’ve located the sump.

I will. Thanks again to all of you guys for your help