Reality check on car-care myths

[dest]

To paraphrase Mark Twain, it's not what you don't know that can come back to bite you; it's what you know for sure that ain't true. When it comes to maintaining your car, misconceptions abound. And even the best intentions can lead you to spend more money than necessary or even compromise your safety. Here are common myths that can do more harm than good

Myth: Engine oil should be changed every 3,000 miles (5,000 kms).



Reality: Despite what oil companies and quick-lube shops often claim, it's usually not necessary. Stick to the service intervals in your car's owner's manual. Under normal driving conditions, most vehicles are designed to go 7,500 miles (12000 kms) or more between oil changes. Changing oil more often doesn't hurt the engine, but it can cost you a lot of extra money. Automakers often recommend 3,000-mile(5,000 kms). intervals for severe driving conditions, such as constant stop-and-go driving, frequent trailer-towing, mountainous terrain, or dusty conditions.



Myth: Inflate tires to the pressure shown on the tire's sidewall.



Reality: The pounds-per-square-inch figure on the side of the tire is the maximum pressure that the tire can safely hold, not the automaker's recommended pressure, which provides the best balance of braking, handling, gas mileage, and ride comfort. That figure is usually found on a doorjamb sticker, in the glove box, or on the fuel-filler door. Perform a monthly pressure check when tires are cold or after the car has been parked for a few hours.



Myth: If the brake fluid is low, topping it off will fix the problem.



Reality: As brake pads wear, the level in the brake-fluid reservoir drops a bit. That helps you monitor brake wear. If the fluid level drops to or below the Low mark on the reservoir, then either your brakes are worn out or fluid is leaking. Either way, get the brake system serviced immediately. You should also get a routine brake inspection when you rotate the tires, about every 6,000 to 7,000 miles (10,000 to 12,000 kms).



Myth: If regular-grade fuel is good, premium must be better.



Reality: Most vehicles run just fine on regular-grade (87 octane) fuel. Using premium in these cars won't hurt, but it won't improve performance, either. A higher-octane number simply means that the fuel is less prone to pre-ignition problems, so it's often specified for hotter running, high-compression engines. So if your car is designed for 87-octane fuel, don't waste money on premium.



Myth: Flush the coolant with every oil change.



Reality: Radiator coolant doesn't need to be replaced very often. Most owner's manuals recommend changing the coolant every five years or 60,000 miles (100,000 kms). Of course, if the level in the coolant reservoir is chronically low, check for a leak and get service as soon as possible.



Myth: After a jump-start, your car will soon recharge the battery.



Reality: It could take hours of driving to restore a battery's full charge, especially in the winter. That's because power accessories, such as heated seats, draw so much electricity that in some cars the alternator has little left over to recharge a run-down battery. A "load test" at a service station can determine whether the battery can still hold a charge. If so, some hours on a battery charger might be needed to revive the battery to its full potential.



Myth: Let your engine warm up for several minutes before driving.



Reality: That might have been good advice for yesteryear's cars but is less so today. Modern engines warm up more quickly when they're driven. And the sooner they warm up, the sooner they reach maximum efficiency and deliver the best fuel economy and performance. But don't rev the engine high over the first few miles while it's warming up.



Myth: A dealership must perform regular maintenance to keep your car's factory warranty valid.



Reality: As long as the maintenance items specified in the vehicle owner's manual are performed on schedule, the work can be done at any auto-repair shop. If you're knowledgeable, you can even do the work yourself. Just keep accurate records and receipts to back you up in case of a warranty dispute on a future repair.



Myth: Dishwashing and laundry detergents make a good car wash.



Reality: Detergent can strip off a car's wax finish. Instead, use a car-wash liquid, which is formulated to clean without removing wax.


http://autos.yahoo.com/articles/auto...ar-care-myths/

[niky]

Myth: Engine oil should be changed every 3,000 miles (5,000 kms).



Reality: Despite what oil companies and quick-lube shops often claim, it's usually not necessary. Stick to the service intervals in your car's owner's manual. Under normal driving conditions, most vehicles are designed to go 7,500 miles (12000 kms) or more between oil changes. Changing oil more often doesn't hurt the engine, but it can cost you a lot of extra money. Automakers often recommend 3,000-mile(5,000 kms). intervals for severe driving conditions, such as constant stop-and-go driving, frequent trailer-towing, mountainous terrain, or dusty conditions.

Unfortunately... this doesn't quite apply to Philippine conditions, which can be considered severe compared to elsewhere. Some manufacturers allow 10,000 kilometer intervals, others specify 5,000 kilometer intervals... even though in the US or Europe, they allow 12,000 - 16,000 kilometer intervals. The local heat, dustiness and traffic are all very bad for engines.

Just because a car that requires 5,000 kilometer oil changes can go 10,000 kilometers in ideal conditions, doesn't mean it actually will in real world conditions.

A better indicator of when a car needs an oil change is in the number of operating hours and/or actual oil condition, but there are very few places that do oil analysis here.

[Memphis Raines]

Ditto here.

We being tropical and all puts any motor oil to the limit. You won't believe how much dust we have in the air until you check your air filter.

Engine soak alone during traffic is enough reason to change every 5k.

[Memphis Raines]

Question: Can opening the hood upon getting home help the engine in any way?

[jaymd]

AFAIK yes it does. it relieves static heat inside the engine bay when the fans are already off and cooler air no longer enters the engine bay. ok daw sa rubber and electrical parts.

[jick.cejoco]

Ditto here.

We being tropical and all puts any motor oil to the limit. You won't believe how much dust we have in the air until you check your air filter.

Engine soak alone during traffic is enough reason to change every 5k.

yes it's true, the philippine road conditions fall under the severe driving conditions- high humidity, dustry, stop and go traffic, some cars with the cooling systems not at optimum; sometimes overcooled sometimes over heating. a big contributor to shorter engine oil service life is due to the fact some oils available locally do not have the right oil additives such as detergents, inhibitors, dispersants and teflon or molybdenum to increase lubricity

[jick.cejoco]

Unfortunately... this doesn't quite apply to Philippine conditions, which can be considered severe compared to elsewhere. Some manufacturers allow 10,000 kilometer intervals, others specify 5,000 kilometer intervals... even though in the US or Europe, they allow 12,000 - 16,000 kilometer intervals. The local heat, dustiness and traffic are all very bad for engines.

Just because a car that requires 5,000 kilometer oil changes can go 10,000 kilometers in ideal conditions, doesn't mean it actually will in real world conditions.

A better indicator of when a car needs an oil change is in the number of operating hours and/or actual oil condition, but there are very few places that do oil analysis here.

a good indicator is the engine oil life monitor on some cars. it counts how many cycles, how many hours and how many miles the car has been driven, just reset counter after the oil change. just like the bmw's, the oil life has to be reset with a proprietary resetting tool after oil change

[Memphis Raines]

This 'change-oil according to number of hours used' is new to me can we have more info on this like, is there a standard to the number of hours on the average as to when to change motor oil?

Does this apply to diesels too?

Thanks!

[jick.cejoco]

This 'change-oil according to number of hours used' is new to me can we have more info on this like, is there a standard to the number of hours on the average as to when to change motor oil?

Does this apply to diesels too?

Thanks!

memphis,
some cars are equipped with this. i have a 1992 toyota previa and it has an engine oil life monitor. some gm cars came with this system since 1986. only some cars have this. the warning light reminds you when to do so. hondas too has this kinda like a light bar below the odometer with luminous orange and luminous green indicators. reset after oil change and all indicator bars turn green again. the number of green bars indicate how much oil life is remaining
jick

[Dec1983]

5000km or 3months whichever comes first please correct me if im wrong. at least thats what i remembered what the toyota SA told me..

[al shaheen]

5000km or 3months whichever comes first please correct me if im wrong. at least thats what i remembered what the toyota SA told me..

For me, I apply 5000 kms or 6 months whichever comes first.

[oj88]

What the article didn't address is that using fully-synthetic motor oils (of the correct viscosity) will allow you to prolong the oil change interval, usually twice as long as compared to using dino/mineral oil.

Also, I disagree about the tire pressure listed on the door jamb as being the maximum pressure allowed. The REAL max pressure that the tire can hold is stamped on the sidewall. For instance, the typical 205/55 16 tires used on the Civic 1.8S has max pressure of 50-51 PSI, as indicated on the tire sidewall. However, the tire pressure listed on the door jamb as recommended by Honda is 32 PSI.

[4agze]

That actually a good read, most apply for people who don't really maintain their own cars but fun to read. If I may add, when I was in Phil. was changing my mom's cars battery, a mechanic asked me not to put the new battery on the ground I asked why he replayed it will get discharge? don't know if thats a Filipino thing. but I didn't listen actually put the battery longer on the ground just to prove a point.

Myth: If you put your car battery on the ground it will get discharge

Reality: a car battery external is made out of propylene plastic and it will not conduct electricity.

[Type 100]

Question: Can opening the hood upon getting home help the engine in any way?

Yep it does, but it's not quite necessary for road driving. Your cooling system and engine aren't quite thermally stressed enough in daily drives - it's perfectly okay if you don't do it.

At trackday events on the other hand, I've seen it's become somewhat of a standard practice to pop the hoods of cars after completing a series of hot laps and coming into the paddock. Everything is thermally stressed there - brakes, tires, drivetrain, cooling system and engine - so it becomes a good idea to do this and relieve the heat.

[Taurus]

That actually a good read, most apply for people who don't really maintain their own cars but fun to read. If I may add, when I was in Phil. was changing my mom's cars battery, a mechanic asked me not to put the new battery on the ground I asked why he replayed it will get discharge? don't know if thats a Filipino thing. but I didn't listen actually put the battery longer on the ground just to prove a point.

Myth: If you put your car battery on the ground it will get discharge

Reality: a car battery external is made out of propylene plastic and it will not conduct electricity.

:funny:

Sabi yata kasi nung mechanic is that yung ground is negative so literally taken :rofl01: and the battery has positive ions with the casing of the battery acting as an insulator and now you have capacitance building up!
:electricf:

[viel_dk]

dapat ba na kapag patay ang makina hindi dapat inaapakan ang accelerator pedal para hindi daw magoverflow ang gas, kasi daw pagnagkataon mahihirapan mag start ang makina..yan ang sabi ng tatay ko sakin...
myth or reality?

[niky]

dapat ba na kapag patay ang makina hindi dapat inaapakan ang accelerator pedal para hindi daw magoverflow ang gas, kasi daw pagnagkataon mahihirapan mag start ang makina..yan ang sabi ng tatay ko sakin...
myth or reality?

Modern fuel-injected cars don't inject gasoline when the ignition is off. So it used to be true, but not anymore.

[niky]

dapat ba na kapag patay ang makina hindi dapat inaapakan ang accelerator pedal para hindi daw magoverflow ang gas, kasi daw pagnagkataon mahihirapan mag start ang makina..yan ang sabi ng tatay ko sakin...
myth or reality?

Modern fuel-injected cars don't inject gasoline when the ignition is off. So it used to be true, but not anymore.

[viel_dk]

Modern fuel-injected cars don't inject gasoline when the ignition is off. So it used to be true, but not anymore.

'96 nissan senta po yung car, so hindi po sya nag ooverflow? right?

[niky]

'96 nissan senta po yung car, so hindi po sya nag ooverflow? right?

Yup. That's about right.