Hot answers tagged

43

Engine oil does much more for an engine than lubricate. It provides cooling, cleaning, and a bunch of other chores. You already know engine function is degraded when you run out of oil. Let's see if we can run it down to make more sense for you how it happens. Let's say, for lack of argument, your engine is running with very little to no oil. The engine ...


22

I would be more concerned about whether engine oil is actually finding its way into the radiator from the engine. If it is, this would be indicative of a compromised head gasket, warped cylinder head, or damaged oil cooler (if the car uses radiator coolant for cooling the oil). The first two items are not trivial to replace or fix. The third one isn't far ...


21

The seller should not be selling the vehicle with oil in the cooling system. That supposed "quick fix" should have been rectified at the earliest opportunity. Have him flush the cooling system and put another few tens of kilometers on the odometer before you even consider such a vehicle. If the seller is topping off the radiator with oil instead of water, ...


21

If it is burning it's oil, the oil is getting somewhere it shouldn't do - and changing the plugs and coil will make no difference to that! As the oil smoke is coming out of the exhaust, that suggests to me that the oil is getting into the cylinders - the most likely causes for this are a blown headgasket, failed valve stem seals, or failed piston rings. A ...


19

You Asked What are the benefits of a dry sump? Simply put a wet sump crankcase has oil sitting in the bottom of the crankcase. It's affected by various forces as the car or motorcycle is driven. At times it is possible, during hard braking or cornering, that the oil pickup is not in oil, resulting in a low or no oil pressure condition that could ...


13

It definitely could have worked it's way (the drain bolt) over the three month period from the previous change. The cause would be an improperly torqued oil drain bolt. It wouldn't be the first time. Getting together evidence that it IS their fault is impossible. So, to clearly answer this question What could cause the oil plug to just come out, if ...


12

In most engines, when you fill the oil, it drains into a reservoir on the bottom of the engine known as the oil pan. The tube for the dipstick goes right down into this reservoir to measure the level of the oil. The other important item located in this reservoir is the pick-up tube for the oil pump. As long as the pick-up tube for the pump stays under the ...


12

tl dr - Have no fear of Vaseline and o-rings O-rings are made out of many different materials. I would suggest that those o-rings which are made to work in the automotive realm are made to be resistant to things such as oil, gasoline, and other petroleum products. This would include Vaseline. While Vaseline and other petroleum products may degrade real ...


12

Number one answer is always Head Gasket. The reason is that there are oil and water passages in close proximity, being separated by a gasket (which might just be flimsy paper or rubber, but is often steel or copper) sandwiched between two pieces of metal with (usually) different thermal expansion rates. This means that any time your engine gets far enough ...


11

An addition to the previous answers: A limiting factor in car construction is the engine height. Using a dry sump setup the engine gets smaller in height and can be located lower. This lowers the car's center of gravity resulting in a better track performance.


11

Unless you recently added oil or had it serviced, I would be concerned. I would wonder what is raising the oil level. Do you have any signs of engine oil mixing with coolant? Does the oil have a tan colored foamy appearance? This could be an indication of coolant leaking into the crankcase.


11

I had exactly the same experience with a chain oil change shop. It's one of the reasons I stopped using any outside mechanic for anything short of things I can't handle due to specialized tools or time required. In my case it was also thousands of miles before the problem showed up. I did have droplets of oil on the driveway, but I can easily imagine ...


10

Yes, it's possible some of the seals designed to withstand water and glycol could get damaged I am thinking you are creating a fictitious scenario here, so I'll roll with it. If you filled your radiator with oil and started your car and let it run for awhile I would be most concerned with damage to seals that were designed to withstand water and glycol. ...


10

Your oil pan didn't rust I would just like to point out that your oil pan can't just rust out. It is made of material that doesn't rust. So when you had a hole in your oil pan it more than likely hit a rock or curb or something that penetrated it. Perhaps the other driver of the vehicle. On the other hand, if your oil pan was replaced with something ...


9

With way too much engine oil in the engine, the problem is that the crankshaft can hit the oil in the bottom of the crankcase when the engine is running. Since the crankshaft is spinning fast, even at idle, each time it slaps the surface of the oil, it will create some bubbles in the oil as the air just behind the spinning crankshaft lobe gets dragged under ...


9

Depending on the car model and the technology used, not all fluids I mention here do exist. Here is list of all that I know of: fuel (some cars use two typed of fuel, e.g., petrol and gas, so they have two fuel tanks) engine oil two-stroke oil (in some systems the oil is separated and only combined in the injection) gear oil Automatic Transmission fluid (...


9

Dry sump oiling systems are primarily used in racing situations. The main purpose is it will provide oil pressure under any type of hi-G maneuvers, to include cornering, braking, and acceleration. A dry sump oiling system is made up of several parts. The reason why it is called a "dry sump" is because the sump, where in a normal engine is the reservoir for ...


9

In very cold climates there are electric heaters that replace the dip stick. They are plugged into an AC outlet and because they reach the oil pan they can apply heat directly to the oil. That way the oil doesn't get cold to the point where it totally looses it's ability to keep your engine protected at start up. It's plugging in that electric heater that "...


9

As race fever indicated, many modern cars, and all hybrids, will record how many hours the ICE (internal combustion engine) has been running. It appears the Ford C-max, along with most other hybrids, pass this clock into an 'oil life indicator' (should have called it Oil Indicator of Life, or OIL for short!), which calculates and displays an alert for when ...


9

It only seems like driving an oil pump is easy, in reality driving an oil pump is very hard. The biggest issue is the viscosity of the oil especially when it's cold. The second issue is, the oil pump is the most critical component of the engine. A bad oil pump leads to engine failure 100% of the time. A bad fan or a bad electric water pump or a bad fuel ...


8

No. As far as I can tell, there is no reason that Vaseline might gradually degrade the rubber O-ring on which it has been applied. O-rings that are manufactured for automotive purposes do tend to be made in a rather durable fashion so as to be able to withstand whatever sort of fluids that might accidentally get spilt during car maintenance. If you are ...


8

I don't have any empirical evidence for this, but would say no for two reasons: An air filter will collect more dust, dirt, and debris until it gets so full that it starts pushing the older dust, dirt, and debris through the filter, which is what you are trying to prevent in the first place. As the air filter collects more dust, dirt, and debris, the ...


8

It all depends on what you mean by getting better. It is possible that, as the very small holes in the filter that let air through start to trap particles, the places where air can get through will get smaller and smaller. Therefore the filter will start to trap smaller and smaller particles. The air filter may get more efficient at filtering, but it will ...


8

Engine oil is normally kept inside a light-proof steel box (your engine), so you might not find much information on how it's affected by sunlight. However, other industries use lubricating oil that can be exposed to the sun, and I found this report: Sunlight Degradation of Lubricants UV light is the enemy, and it can affect oil: On a molecular level, ...


8

Pull the spark plugs and inspect them. Oil-fouled spark plugs will look wet and black.


8

This is a myth. A lot of oldschool mechanics and non-chemistry educated people say this. You should first drain the oil while it's hot, put an oil/engine flush combination in and run it for a few minutes. Then you should be good to go. There is almost no difference between synthetic and non-synthetic. Synthetic oil has detergents in it. The petroleum ...


7

Recycle it. Don't use it for anything, it's an environmental hazard. Just get rid of it in the least impactful way. Used motor oil has a plethora of bad chemicals and compounds in it that eliminate for another use once it has been inside your engine for an extended period of time. Aside from the hydrocarbons there is lead, phosphorous, berium, zinc, ...


7

It's not a good idea to run the engine dry like that because the bearings on the crankshaft need oil pressure for lubrication. Having said that, some engines can run without oil for a short amount of time thanks to whatever residual oil is trapped between the bearing surfaces. I don't think you would spin a bearing with a limited amount of cranking, but you ...


7

An air filter that is severely restricting air flow can increase oil use. It is not common. If the air filter is restricted enough a low pressure condition is set up in the intake tube and PCV system. Oil is pulled from the upper valve cover oil/air separator cavities through the PCV fresh air hose into the intake tube. If this is happening there will be ...


7

The light comes on when the oil pressure is low. If the oil level is fine, I would say you have either a faulty oil pressure switch (or a bad contact to it) or a dying oil pump. I would hope for the faulty switch if I were you - it's a cheap fix. If the light is intermittent then the switch is also much more likely. However if the light only turns on on ...



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