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23
votes
11answers
43k views

What happens if I change the oil when the engine is cold?

I have always changed the oil in my vehicles with the engine hot, because the manuals always say to let the engine reach normal operating temperature first. Oil change instructions all over the ...
23
votes
1answer
6k views

Why are wheels labeled “R16” when the 16" is actually the diameter?

Just wondering about this, unless the R doesn't mean "Radius" it doesn't make much sense.
23
votes
10answers
7k views

Cheap winter tires vs high quality all seasons

My car honda CR-V is in pretty desperate need of new tires. I've put away a small amount from my last few paycheques, but it's not a whole lot. I'm curious as to whether you would feel it's a better ...
23
votes
1answer
2k views

A/C loses chill when turning on blower. Why?

Following the guidance from this Q&A, I measured the output temperature of my 2012 Town and Country A/C. Under the test conditions proscribed, with outside temperature of 87°F and 55% relative ...
23
votes
7answers
170k views

What damage does a car suffer if not regularly used?

Sometimes I use the car on daily basis, but there are months when I don't use it at all, and it sits parked outside for 5+ weeks, with the battery disconnected. (Main reasons: working from home that ...
23
votes
6answers
113k views

Does a timing chain need maintenance?

Does a timing chain (as opposed to timing belt) need any specific maintenance? In particular I'm talking about a BMW Z4
23
votes
8answers
10k views

Static electric shock as I leave the car

Now this has started to "interfere with concentration". It is happening when i am getting out and trying to close the door. I feel a static shock as i touch the metal part of the door as my foot ...
23
votes
3answers
97k views

Is starting your car with the A/C on bad?

I was always yelled at by my father when I was first starting to drive when I left the A/C on when I turned off the car, and then later turned it back on, with the reasoning that I was ruining / ...
22
votes
7answers
13k views

Leaving car for 3 weeks, change oil before or after?

I'm going on vacation for 3 weeks and am due for an oil change right at that time. Where I live is cold, I may be able to store it in a garage however. My car is a 2017. Should I get the oil change ...
22
votes
11answers
301k views

What happens if a single spark plug unexpectedly goes down in a multi-cylinder engine?

AFAIK vehicle manuals say owner must replace spark plugs every N miles. Suppose he fails to do so and a single spark plug unexpectedly dies in an engine with multiple cylinders right in a freeway. ...
22
votes
7answers
13k views

What's the point of servicing a car?

As you can probably tell from the question, I know almost nothing about motor vehicles. So apologies for my ignorance but I wasn't sure where else I might get this question answered impartially. ...
22
votes
16answers
438k views

How do I loosen stuck lug nuts in order to change a tire?

How do I loosen car tire lug nuts (so that I can change a tire) when they are really really stuck? I have tried turning the provided wrench, even standing and jumping on it. This worked for 4 of the ...
22
votes
3answers
5k views

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

Most people know that for old or even somewhat old cars, manual transmissions are more efficient. Recently automatic cars have become almost as efficient or even as efficient as manuals. I was ...
22
votes
4answers
13k views

Why do tyres go flat after a few weeks of non-usage?

My car is a 2007 model FIAT Albea 1.3 liter 4-door saloon. I think it might be the "fire" version. Made (assembled) in Turkey. I use it 6 months a year but 4-5 weeks at a time. When it's stored/parked ...
22
votes
14answers
100k views

How long should I let my car warm up in the winter?

I have been reading mixed reviews about how long to let your car warm up before driving in the winter months. Most of the articles say that the best way to warm it up is to let it idle for 1-2 minutes,...
22
votes
2answers
20k views

Why doesn't the engine stall out when you come to a stop with an automatic transmission?

When you come to a stop with a manual transmission you have to push the clutch in or take it out of gear to keep the engine from stalling out. What keeps the engine from stalling in an automatic ...
22
votes
7answers
310k views

Is idling bad for your engine?

If I sit in my car for 30-40 minutes with the AC and the car idling, does that "hurt" the engine, or does it simply waste gas and pollute the air? Would it be better if I turned off the car? A ...
22
votes
7answers
67k views

Aluminium engine vs Cast Iron engine

What is the advantage that the aluminium engines provide over the cast iron engine apart from the fact of rusting and weight reduction. Manufacturers like to boast about their all new aluminium ...
22
votes
5answers
4k views

Why would I want to measure torque while loosening a bolt or nut?

An answer to a question asking about torque wrench maintenance mentions to not use a particular kind of torque wrench for loosening bolts. This got me thinking. I would think it'd be preferable to ...
22
votes
2answers
14k views

Why do we need to cool air after it leaves a turbocharger?

When we are using a turbocharger to compress the incoming air, the air gets hotter. Usually this hot air is cooled by using an intercooler before it's passed to the engine. What is the reason behind ...
22
votes
4answers
2k views

Are there requirements for building a car-PC and it's software?

I am currently rebuilding a car as a hobby. As a part of it I am planning on building in a car PC with custom software for some multimedia usage, navigation and some diagnose usage. I know there are ...
22
votes
7answers
32k views

Grease on wheel bolts or not?

My father (an engineer, but not an auto mechanic) taught me to use a tiny dab of machine grease on the thread (not the rim) of each wheel bolt. This would help against corrosion, and help when ...
22
votes
1answer
77k views

How can I repair cracks in leather seat?

The leather on the side of the driver's seat has some minor cracks. I am using conditioner to help prevent this in the other seats but these cracks already exist. Is there a product or patch of some ...
22
votes
1answer
26k views

LTFT and STFT values are off and don't make sense

Car is a 2015 BMW M5 and it has an aftermarket CAI and a catback (slip on) exhaust. No other performance mods or tunes. About 6-7 months ago, I bought a Kiwi OBD-II reader, simply out of curiosity ...
22
votes
3answers
138k views

Must I Replace All 4 Tires on an All Wheel Drive (AWD) vehicle?

I have a 2005 Subaru Legacy 2.5i Wagon. I just destroyed the passenger-side rear tire. The tires have approx. 6/32" tread remaining, per an informal measurement with a coin (I used this guideline ...
22
votes
6answers
116k views

What is causing this terrible grinding/groaning noise when I come to a slow stop sometimes? (but not always!)

Update 11/9/2013 After a good bit of driving, the noise reoccurred. I took it back to the mechanic and we decided it must be the brake pads. They're pretty worn out, and like I said before, they're ...
21
votes
13answers
51k views

Leaving car with automatic transmission in Neutral instead of Park

Can we use Neutral (N on the selector) instead of Park (P) when parking on a flat surface? Is this useful for transmission system? Because every time we put gear on P we must pass through R and will ...
21
votes
4answers
18k views

Is revving the engine to redline on idle at morning bad? [duplicate]

I own a Ford Ecosport Diesel Turbo 1.5 TDCI. Every morning when I start the car, I put it on neutral and rev it up to 6K RPM for 3 seconds then bring it back to normal idling without revving and start ...
21
votes
6answers
46k views

How to raise the car higher than the jack stands will allow?

So it's time to raise the car onto jack stands, but for whatever reason it needs to go higher than the stand height allows. How can I safely raise the height of the car? What I have done in the past ...
21
votes
4answers
19k views

Is it safe to drive my car to a repair shop with a bolt in the tire? (picture)

Last night I ran over a bolt and it went straight into my front passenger tire. The shop that I usually take my car to for repairs is about 8 miles away (if I take no freeway), 7.5 miles away by ...
21
votes
10answers
16k views

Is a bigger car safer than a smaller car? [closed]

From the point of view of mass, a smaller car appears to be a disadvantage if in an accident with a bigger car, because the change in momentum of the smaller car will probably be higher. A bigger car ...
21
votes
7answers
7k views

How slow ( not zero) can a car engine run without hurting engine and saving on fuel

New cars have stop-start system (even though this has been available for a long time). My question is: why are car companies emphasizing shutting the engine down at a traffic light, rather than making ...
21
votes
5answers
19k views

Garage tech drained oil and forgot to refill. I drove off - what damage could this have caused?

I went to a Quick oil change place, and they drained the oil from my new Fiat 500 and did not refill/replace oil. After I started the car, I drove approx 1/8 mile before engine quit. The car would ...
21
votes
5answers
20k views

How do you un-seize an engine?

I have an older engine that is seized. It is a 1953 Desoto Hemi. How can I un-seize it? I have sprayed Sea Foam Deep Creep down the plugs and let sit for weeks. As well as transmission fluid. To no ...
21
votes
9answers
93k views

Battery drains by itself when vehicle is parked (parasitic draw)

A 1998 Jeep Grand Cherokee has gone through 3 batteries in the last 3 months. While they have all been replaced by warranties, it'd be nice to get the problem solved permanently. I've tested the ...
21
votes
4answers
5k views

Does flooring the throttle while traveling at lower speeds increase fuel consumption?

I've noticed that in a manual transmission vehicle when going uphill I have two options: Downshift and press the gas more Stay in the same gear and press the gas more I haven't measured it but ...
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 ...
21
votes
3answers
19k views

Is it ok to use a scissor jack instead of a floor jack?

I need to jack up my car to take out the front driver side tire and change the p/s and alternator belt. I don't own a floor jack but I do have a scissor jack. I was wondering could I just use the ...
21
votes
4answers
3k views

proper oil for 1940's era aluminum ford engine

I would like to know the proper oil to use in a Ford GAA engine from around 1945. Could be as late as 1958. From a series of photos of a GAA being restored on Flickr. Currently this engine has all ...
21
votes
4answers
4k views

What are these loops in the brake line for?

I was watching a show on the Velocity network about truck modifications, and I saw the following closeup of the trucks master cylinder and booster. What I don't know is why the designers put the ...
21
votes
3answers
2k views

Does a carburettor engine apply fuel at high speeds when the pedal is no longer depressed?

There's a question that is pretty similar to this one except the existing question satisfies EFI engines. EFI question Let's say I roll down a hill at a considerable speed I let go of the gas. Say ...
21
votes
5answers
198k views

What does the 'cc' mean on a motorcycle?

I'm relatively new to motorcycles, my flat mate taught me how to drive his two Royal Enfields around New Delhi, and for the past year and a half I've been taking care of them as they break down ;) ...
21
votes
4answers
4k views

How do I roll my 4x4 vehicle back onto its wheels?

I go 4-Wheeling A LOT with groups in Arizona. A slow speed rollover is a relatively frequent event. You just get a bit to much lean on the vehicle trying to navigate a difficult section of a trail ...
21
votes
12answers
188k views

Is Prestone “All Makes/All Models” coolant *really* compatible with all models?

My car's manual says to use the blue Honda coolant: Always use Honda All Season Antifreeze/Coolant Type 2 [MSDS]. This coolant is pre-mixed with 50 percent antifreeze and 50 percent water. It ...
21
votes
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?
21
votes
2answers
2k views

How To Read Car Tires

On my VW Passat B5 tires, there is a marking that reads "195/65R15 91 V". What does this mean? Do I have to get replacement tires with this exact marking on the side of the tire in the future or not? ...
21
votes
2answers
20k views

Why is towing a manual transmission car, in neutral, with the drive wheels on the ground, considered safe?

It is clear that cars with automatic transmissions cannot be towed with any drive wheels on the ground, engine off, in neutral, because the torque converter powers the lubrication pump for the ...
21
votes
4answers
5k views

Replace car batteries with capacitors?

I recently watched this video on YouTube which basically shows the guy replacing a larger capacitors with some smaller capacitors which he had bought. The larger capacitors were actually in place of a ...
21
votes
1answer
2k views

What does pie cut exhaust mean?

As the title says, when looking at building a custom exhaust system I've heard the reference called pie cut exhaust but I was unable to find any definition or terminology so I was curious to know what ...
21
votes
2answers
3k views

How exactly does a differential work?

I understand that the differential (or "diff") is the thing that allows the drive shaft to transfer its rotational velocity to the front or rear axle in order to move the car. As far as I know, the ...

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