Questions tagged [oil]

This tag should be used for anything related to the use of automotive engine oil, or in reference to other parts of the car that also require lubrication using oil.

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42
votes
4answers
107k views

How far can I drive with 1 gallon too much oil?

I have way too much oil in my Acura TSX. Do I need to take care of it without turning it on or can I drive it to a service station? If I need to do it in place, I don't have the ramps or a pan or ...
60
votes
9answers
727k views

What actually happens when there is not enough oil in a car engine?

When a car is topped up with oil, it clear to most people that you are supposed to fill it to the recommended amount as specified by the manufacturer (normally on a dip stick). What exactly are all ...
26
votes
4answers
470k views

What actually happens when there is way too much oil in a car engine?

I saw the answers to a question I posted recently highlighting the disadvantages of having too little oil in an engine, but that got me wondering what if the complete opposite were to occur! I know ...
9
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3answers
215k views

Oil in coolant - how much trouble am I in?

I have oil in my coolant reservoir. Could it just be the head gasket or is it almost certainly the entire engine or might it be something else entirely? Thanks in advance...
10
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4answers
57k views

How to understand different engine oils?

When I went to shop for engine oil, I found many types as such: 5W-30 A5 5W-30 A1 5W-20 SAE 5W-30 10W-30 Also I see other information such as: Fully Synthetic Semi Synthetic Oil Synthetic ...
19
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4answers
677k views

Will Putting An Extra Quart of Oil In My Car Ruin It?

I put too much motor oil in my car's motor. About a quart - have I ruined my car? I've been driving it. I know I need to get the oil drained. But I'm worried that I've ruined my car which has been ...
11
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6answers
1k views

Second hand car - Engine/Tyres/Etc

I am looking into buying a second hand car from a reputable Mercedes-Benz dealer (not just some dodgy salesman by the side of a road lol....). Anyway, there are a few maintenance/mechanical things ...
10
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3answers
70k views

Accidentally poured engine oil into the coolant reservoir

My 1990 Mazda 626 leaks oil like a sieve, so I regularly top up the oil. In a moment of stupidity, I opened my radiator cap instead of my oil cap while topping up my engine oil, and poured about 50-...
19
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6answers
40k views

Is it OK to mix oil of different viscosity in a Wankel engine?

I have a Mazda RX-8 (with a Wankel rotary engine). Mazda advises North American owners to use 5W-20 oil. The engine was just replaced 200 miles ago by the dealer so it currently has 5W-20 in it. ...
10
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2answers
6k views

How does the change oil light system work and does it matter what type of oil you use for it to work properly?

I want to know if the methods a vehicle decides when to turn on the oil change light have to do with the qualities of the motor oil used in the last oil change. I have heard that the vehicle's ...
28
votes
4answers
499k views

What causes an engine to burn oil?

What are the different problems that can cause an engine to burn oil and in general how difficult / expensive is each one to repair? How do you diagnose each potential cause? I found this article ...
21
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5answers
13k views

What differences between synthetic and dino oil?

What are the main differences between synthetic and dino oil? Is one always better than the other?
25
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6answers
208k views

What are the risks of overfilling a small engine with oil?

I recently overfilled a 4 stroke lawnmower engine with oil. It has been run for about 1.5 hours while overfilled. It smokes a lot right after being started but after 30 seconds or so the smoke clears. ...
20
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3answers
12k views

Is it worth switching to full synthetic or blend oil in my older car/truck?

I have an older (enter vehicle here) that has 100k miles on it. Would I see any benefit switching to full synthetic or synthetic blend oil? Is it worth the extra cost in an older vehicle? For ...
11
votes
1answer
45k views

Does engine oil get old and go bad?

Does engine oil actually go bad from just sitting within an engine that's not getting use? I feel conventional motor oil has been sitting underground for millions of years prior to being extracted and ...
14
votes
3answers
11k views

How do I select the right oil for my car?

I can give you my cars make and model and the conditions that I drive in, but I'm looking for a general guide to selecting the right oil for a car. I'm not really knowledgable when it comes to cars so ...
3
votes
4answers
19k views

TVS Apache RTR 160 - What Grade Engine Oil Should I Use?

I bought a TVS Apache RTR 160 second hand. I want to know what grade engine oil should i use for my bike. I was suggested to use 15W50. Is that a good choice. The bike has done almost 65000Kms.
17
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8answers
19k views

Will having a radiator full of engine oil do damage to the motor?

I've got one question; I was looking over this car that I was going to buy and there was engine oil in the radiator. I asked the guys why it was in there and he said he didn't have enough coolant to ...
12
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6answers
81k views

Is it normal for the oil to be dark in color right after an “oil change” in a 10-year old diesel car?

I took my 2002 Jetta TDI wagon to a neighborhood shop about 10 miles, 24 hours ago. They supposedly changed the oil, but the color is very dark, almost black. Definitely not light-colored/transparent. ...
11
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6answers
3k views

What can I do with used motor oil?

Besides recycling? I've heard, for example, that I can use it to lubricate the drive chain (in a motorcycle / bicycle), but that doesn't appeal to me.
9
votes
3answers
46k views

Is topping up the oil enough of an oil change?

If you use synthetic ester-based oil in a relatively new petrol engine, top it up regularly, and the engine runs very quietly and basically without any noise whatsoever (especially after another top ...
6
votes
2answers
6k views

How exactly does an increase in engine temperature cause a car to breakdown?

I have an engine temperature gauge on the dashboard of my car (as most people do), but if for some reason the engine temperature is caused to increase (due to a lack of cooling or what have you), the ...
4
votes
1answer
512 views

Quick Oil Change place overfilled my BMW Z3

Just got this car, a BMW Z3 3.0 from a Tampa dealer and have not even had it 10 days and Check Engine Light came on. I wanted to get the oil changed to full synthetic just in case it wasn't and ...
3
votes
3answers
6k views

What is the difference between JASO MB and JASO MA and JASO MA2

I want to ask the differences between the JASO MA MA2 and MB oils.I have checked the JASO website but does not offer much information on this.Also why is it advised to not use JASO MB oil for ...
3
votes
2answers
1k views

Is it beneficial to run high viscosity oil in an old engine near the end of its useful life?

I have often heard that high viscosity oil (higher than what the manufacturer recommends) is good for old engines, engines that are nearing the end of useful life. So, for example let's consider a ...
2
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2answers
1k views

What are the temperature ranges for different oil grades?

I was reading up on oil grades in wikipedia and was wondering what the operating temperatures are for the various oil grades. I'm wondering since the area I live in is a pretty Mediterranean climate ...
1
vote
1answer
2k views

Does one have to change ester-based fully synthetic oils?

They say that ester-based oils are used in jet-engines, where the oil is sealed, and it never has to be changed. If I use an ester-based oil as the lubricant for my Jetta 2.5L petrol, such as the ...
1
vote
1answer
28k views

Difference between mineral engine oil and synthetic engine oil [duplicate]

I would like to know the exact difference between mineral engine oil and synthetic engine oil. Why is it advised to use mineral oil for the engine when the bike is new and later switch to synthetic ...
14
votes
2answers
2k views

How do I troubleshoot the source of oil in my coolant?

I would like to know the step by step troubleshooting procedure for discovering the source of oil appearing in coolant. There are several different points of failure that can be the root cause for ...
16
votes
9answers
103k views

Is an “oil life indicator” a reliable indicator for when to change the oil?

I have a 2014 Honda Pilot with 3600 miles on it. Historically I have always changed oil in my vehicles every 3000 miles, using good quality non-synthetic oil. Now this Honda has an "oil life ...
15
votes
1answer
34k views

If you change your oil with synthetic can you never safely go back to using conventional?

I know that sounds like a weird question but I was talking to my brother in law about oil changes and I mentioned that I almost always use Mobil 1 full synthetic. He replied, "make sure you keep ...
7
votes
2answers
22k views

What are all the different types of fluid in a car and a short summary of their use?

A fluid is defined as anything that flows, hence for our purposes a gas or a liquid. I know that there is fuel, engine oil, engine coolant and brake fluid. Also air is normally taken in through a ...
7
votes
3answers
13k views

Old Cars Burning Oil: How much is too much?

I've heard that it's "normal" for older cars to burn a certain amount of oil and that it's not really a problem. My question is how much is too much? At what threshold does burning oil become a ...
6
votes
1answer
1k views

Can the viscosity of the oil affect gas mileage?

If a manufacture recommends a certain weight of the oil for the engine, lets say 5W-40 and instead 5W-30 was used, would the gas mileage of the engine increase as the piston does not have to do as ...
5
votes
3answers
8k views

oil in coolant reservoir … urgent … Peugeot 206 Xri … 2006

I need some advice I'm broke and I need the car (like it's not an option) it hasn't overheated yet . This just happened about a week ago, I'm driving way slower like 50/60kmh and 70/90kmh when in ...
5
votes
0answers
4k views

Diagnosing oil consumption on Nissan VQ35DE (350z / G35)

I have a 2004 Infiniti G35 6MT coupe. Nissan VQ35DE engine with a bit over 156,000 KMs (about 96,000 miles). Since I bought it, I've noticed some oil consumption at a rate of about a litre every 4,...
5
votes
2answers
2k views

Synthetic Oil and oil change frequency

My car (a 2008 Scion tC) says to have its oil changed every 5K miles or 5 months. I just took a new job and commute into the city by bus so I'm driving a whole lot less. I was told that if I got full ...
4
votes
1answer
2k views

Do Compression Rings and Oil Ring Wear at the Same Rate?

Is it possible that the oil control rings might be worn to the point that you're burning significant amounts of oil, but the compression rings still be good? Or do they typically wear out together ...
2
votes
3answers
11k views

Can camshaft seal leaking hurt timing belt and cause sudden engine breakdown while driving? - Volvo XC90

Volvo service told me that the camshaft seal of my Volvo XC90 needs to be replaced for $1000. I see no oil on the timing belt, its dry. It just has some black dust. If there is real leak, can it ...
2
votes
1answer
12k views

What is compressor oil rating PAG ND-8 equivalent to?

The Land Rover LR3 service manual specifies: Compressor oil : Denso ND-8 PAG oil I'm scratching my head trying to figure out whether the following oil, which seems equivalent to ISO VG 32 would do ...
1
vote
2answers
53k views

How often to change oil if vehicle gets under 1500 miles per year? [duplicate]

For non-synthetic oil, how long can you go without changing the oil if you regularly only use a vehicle a couple times per month, for 30 miles per drive? That's a total of only 1000-1500 miles/year, ...
21
votes
4answers
4k views

What are the benefits of a dry sump?

I've heard references to dry sumps, usually in reference to racing engines. But more recently I came across an article about a 'supercar' which stated that it had a dry sump. What are the benefits of ...
15
votes
4answers
148k views

Why check oil when engine is at operating temperature?

The owner's manual to my VW Golf Mk7 states With the engine at operating temperature, park the vehicle on a level surface to ensure that the engine oil reading is correct. Why is it important for ...
13
votes
3answers
45k views

How low does the oil level have to get to trigger the low oil light?

I had an engine shudder during my idle after startup yesterday morning. I checked my oil level and was a full X cross hatch height below the min oil line. I added 1.5 qts to get up to the max line. It ...
12
votes
6answers
11k views

What happens if unsuitable oil is used in a vehicle engine?

I recently heard an urban legend-like story about a guy in a developing country who decided engine oil was too expensive and so used some vegetable oil instead. The story says the car ran for some ...
10
votes
1answer
652 views

Why are recommended oil weights lower for many newer cars?

I've noticed that the recommended motor oil weights for cars in the last 5-10 years are often lower than earlier models. It seems like 10w-30 used to be almost ubiquitous in the 80s and early 90s, but ...
9
votes
3answers
18k views

I used 0W-30 instead of 0W-20. Is it serious?

I have a Nissan Sentra 2014. I wanted to start using full synthetic oil, and the manual said I should use 0W-20. I changed both the oil and the filter (I used this one), and after finishing I realized ...
9
votes
2answers
13k views

How to test if oil is leaking into combustion chambers?

How can I test whether oil is leaking into cylinder combustion chambers and getting burnt in case of oil level loss? As opposed to, for example, leaking through the oil pan or the timing chain cover.
8
votes
2answers
14k views

Do different brands of the same oil really make a difference?

I've found several other questions on here that answer, "what's different between synthetic oil and regular oil?" or "Can I use X oil in Y car?", or similar, but nothing that quite answers my question....
8
votes
2answers
735 views

Mayonnaise on tip of dipstick - new car, low miles, well maintained. What to do?

This question is about a 2014 Renault engine fitted in our family car, we've owned it since new and I've done all the maintenance to the book. We chose the petrol engine over the diesel because we ...