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when to change your oil
#1

I FOUND THIS ARTICLE IN THE NY TIMES TODAY. THE ITEM ABOUT SENDING YOUR OIL IN TO BE ANALIZED MIGHT BE VERY HELPFULL!!! LOOK NEAR THE BOTTOM OF THE ARTICLE ABOUT BLACKSTONE LABS AND THE $25 FEE

The 3,000-Mile Oil Change Is Pretty Much History

I STILL remember learning from my father how to carefully remove a dipstick to check the oil level in our cars. It was drilled into me — along with turning off the lights when you left a room and clearing the plates off the table after dinner — that oil needs to be changed every 3,000 miles or so.

I’m not sure what I thought would happen if I didn’t, but I vaguely imagined an unlubricated engine grinding to a halt.

Childhood habits are hard to undo, and that’s often good. To this day, I hate seeing an empty room with the lights on.

But sometimes, we need to throw aside our parents’ good advice. In March, for example, I wrote about how we should relearn the dishwasher and laundry soap habits we inherited from our mothers.

Add frequent oil-changing to that list.

“There was a time when the 3,000 miles was a good guideline,” said Philip Reed, senior consumer advice editor for the car site Edmunds.com. “But it’s no longer true for any car bought in the last seven or eight years.”

Oil chemistry and engine technology have improved to the point that most cars can go several thousand more miles before changing the oil, Mr. Reed said. A better average, he said, would be 7,500 between oil changes, and sometimes up to 10,000 miles or more.

The California Integrated Waste Management Board ran public service announcements for several years about “the 3,000-mile myth,” urging drivers to wait longer between oil changes. Although the information is a few years old, the board has a list of cars on its Web site and how often they need oil changes. The concern is not only the cost to drivers, but the environmental impact of throwing away good oil, said Mark Oldfield, a recycling specialist for the agency.

But the situation is not that clear cut, according to Robert Sutherland, a Pennzoil scientist who works at Shell Global Solutions.

Rather than picking a number, Mr. Sutherland said, he recommends following what your owner’s manual advises. I checked the manual for our 2007 Mazda5 and had to determine if my typical driving included a lot of stop-and-go driving, short distances, extended idling, muddy, rough or dusty roads or really humid or cold temperatures.

Hmm. Yes, to short distance and stop and go. So that meant I should get the oil changed every 5,000 miles. If I did a great deal of longer-distance highway driving, it would be every 7,500.

The different types of driving are usually known as severe and mild (which is also sometimes called normal), Mr. Sutherland said, which seems counterintuitive since most of us probably don’t think we drive in severe conditions. But we do.

The reason, he said, is that if you take a trip of less than 10 miles or so, the engine and the oil are not completely warmed up. And if the oil is still cool, he said, it cannot absorb the contaminants that come from internal combustion as efficiently.

“It’s designed to work best when fully warmed up,” Mr. Sutherland said. “If you’re running to the music lesson, to school, the gym, that’s severe driving conditions.”

Mr. Sutherland said he has a mild commute. “It’s 47 miles, all highway.”

What actually happens if you don’t change your oil? Well, it doesn’t run out, it simply gets dirtier and dirtier. It’s like mopping the floor with a bucket of water and detergent. The water starts out clean, but the more you use it, the filthier it gets. Eventually, you’re making the floor dirtier if you don’t change the water.

Some people remain attached to the 3,000-mile oil change and have a hard time trusting the recommendations in the owner’s manual. If you’re one of those skeptics, you can send your engine oil out to be analyzed. Blackstone Laboratories in Fort Wayne, Ind., one of the best-known places for engine oil analysis, will send you a free kit.

You send back an oil sample and for $25, they’ll tell you all sorts of things about your car.

“We would compare what your oil looks like compared to the average Mazda5 of that year,” said Kristen Huff, a vice president at Blackstone. If there is a lot more lead in my oil than in a typical Mazda5, for example, it means I have a bearing problem, she said.

Her lab runs about 150 samples a day and a fair percentage of those are consumers looking to find out how often they need to change their oil, Ms. Huff said. [/b]

“Very often, it is the case that they’re changing their oil too often,” she said. “They do what their dad did with his ’55 Chevy.”

Another way to get a more accurate assessment of your oil needs is to buy a car that has a maintenance minder, like a Honda. A light on the dashboard alerts the driver when the system judges that the oil has only 15 percent of its useful life remaining. The time between oil changes varies depending on the driver and driving conditions.

Honda has used such maintenance minders on most models for at least the last five years, said Chris Martin, a Honda spokesman. Previously, the owner’s manual suggested changes every 10,000 miles in mild conditions and 5,000 miles in severe conditions.

Still, some people stick to the 3,000-mile changes, because “the Jiffy Lubes of the world have done a good job convincing people,” Mr. Martin said

It’s not just the fast oil change outlets. My sticker from my trusted mechanic states that I’ll need a change in 3,000 miles or three months. But Jiffy Lube, the largest quick oil change company in North America, is now under pressure to change its automatic 3,000-mile recommendation.

For about a year, the company has run a pilot program with some franchises across the country suggesting that instead of a blanket recommendation, mechanics tell customers what the manufacturer recommends under mild or severe driving conditions.

“By this time next year, every Jiffy Lube will do it,” said Rick Altizer, president of Jiffy Lube International. And the little sticker on your windshield will no longer simply state when the next oil change should occur, but, “I choose to change my oil” at a specific mileage.

“It’s so it’s not some arbitrary technician saying this,” Mr. Altizer said, but the consumer’s decision.

Mr. Reed of Edmunds.com said car owners often got conflicting messages because of an inherent tension: “The car manufacturers want the reputation that it makes cars that last a long time. The dealership wants to see you every three months.”

But he acknowledged that “3,000 miles strikes a deep chord with the consumer,” adding: “It feels good to get an oil change. If you fill up the car with gas, wash it and change the oil, it runs better. Of course, it doesn’t. But it’s the perception.”

Although Mr. Reed is doubtful that most drivers fall into the severe driving category and fears mechanics will use that to push drivers into paying for more oil changes than necessary, Mr. Sutherland said he wouldn’t want “to second-guess the manufacturer.” Vehicles, he said, “are a substantial investment and changing fluids is how you protect that investment.”

So before you go in for your oil change, dig out your owner’s manual and see what it says. And when the mechanic slaps on a sticker that gives the next change date in 3,000 miles, ask questions. And then, go get the car washed. That’s one thing that always seems to be needed.

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#2

[quote name='williamoss' date='Sep 13 2010, 12:42 PM' post='98358']
I FOUND THIS ARTICLE IN THE NY TIMES TODAY. THE ITEM ABOUT SENDING YOUR OIL IN TO BE ANALIZED MIGHT BE VERY HELPFULL!!! LOOK NEAR THE BOTTOM OF THE ARTICLE ABOUT BLACKSTONE LABS AND THE $25 FEE


For whats it's worth, I still change at 3000 miles. I recently switched from Mobil1 to Brad Penn.

Richard
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#3

Blackstone Labs is great. I have been sending samples from my 200HP air cooled airplane engine for years. However the point is that trends are what are important in this testing. A one time sample won't tell you anytihing. I do oil changes on my airplane engine between every 40 and 50 hours of operation. That works out to about 4 samples to Blackstone per year. They do the analysis, send the analytical results and write a commentary about the trends. They know the engine pretty well after awhile.
Now I've never used them for automotive engines. But since I've just done a complete overhaul on mine, I might start doing it. With my mileage it'll likely be a once a year oil change for me.
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#4

" we should relearn the dishwasher and laundry soap "

I guess you are going to leave us hanging on the big soap debacle? [img]style_emoticons/<#EMO_DIR#>/dry.gif[/img]
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#5

“Very often, it is the case that they’re changing their oil too often,” she said. “They do what their dad did with his ’55 Chevy.”


I would like to do this as well. I've also been obsessed lately with finding out who producing the good stuff and whats the stuff that I need to stay away from. I'm finding that the oil biz is very very deceptive. Its so hard to find honest testing. Many of the oil brands disguise reviews to look like they're produced by independent companies or even TV shows.

http://www.youtube.com/watch?v=Z3p-WXDTwyo

http://www.youtube.com/watch?v=vmLP95N_DX0...feature=related

Has anyone ever heard of Power TV? It seems the only shows they have ever run were oil comparisons with ENEOS and a "leading" Japanese oil.
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#6

In the 944 which I had for over 18 years and on which I put more than a quarter million miles, running on conventional oil no less, I changed it ( if and when I remembered to do so ) maybe at around 15,000 , sometimes at 25,000 intervals.. I NEVER had any problem with the engine, and it ran ran perfectly at 250,000 miles on the odo when I sold it. So you can just imagine how often I'm inclined to chage my synthetic oil ! [img]style_emoticons/<#EMO_DIR#>/dry.gif[/img] However, since it doesn't hurt and it's so easy to switch the cartrige in the Canton filter, I probably do that more often that I did on the 944, though I have no particular schedule to follow..

I switched from Mobil 1 to Amsoil five years ago, not sure it makes any difference but my mechanic has been using Amsoil in his Porsches, his brother's Ferrari , his wife's
MBZ AMG and he swears by it, so I'm guessing if he's confident this is good for cars whose engine by itself is worth about 2 whole 968s, this oil can't be all that bad [img]style_emoticons/<#EMO_DIR#>/rolleyes.gif[/img]
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#7

Dan, just confirm that your mechanic's not an Amsoil distributor, and I'll convert too. [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img]
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#8

Dan

Are you still mixing 5W and 10W.

I mention it because I'm thinking of going to a 5W. Were you using 5 before or 10W?
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#9

Lear - funny, no, but I wonder if he gets a big discount being "in the business" .. ?

Rhude - I'll check when I get home to see what weight I'm using now ( having a senior moment ) , however, I did mix the weights the last time.


BTW,when the engine was taken apart ( after the timing belt snapped, leading to the head being rebuilt ), although I could not see the shape of the engine's bottom half, rods, etc. everything on the top end looked incredibly clean - no carbon deposits and especially no visible wear on any components. Even the variocam : the pads had no tracks, not even the bottom one showed more than a faint trace, the sprockets looked almost out of the box new... this at 100,000+ miles. So that served to confirm in my mind anyway, that Amsoil must have done a great job even under the infrequecy of my oil change intervals. And the car ran like a raped ape ( as Flash put it ) so it's not as if it was just clean but it had problems..it was perfectly smooth and responsive as can be. Furthermore, I almost never drive the car below 4,000 RPM - yes folks, even when "cruisng" 1,000 miles on my trips to L.A., I keep it above 4k all the time , and take it to the redline more often that I should so that's even more stress. Actually that probably speaks more to how well these engines are built than anything about oil brand or type [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img] Also guessing the Chevron gas I use exclusively ( with whatever additives they put in that ) might have contributed in some small way to how clean the engine was.. Anyway, bottom line is that I'm pretty comfortable with the low frequency of oil changes given my experience. Not suggesting this will work for anyone else, just that it did ok in my case. YMMV

There you go - free advertisement for Amsoil and Chevron in this post and I don't even get a damn penny from either of those two for the trouble [img]style_emoticons/<#EMO_DIR#>/tongue.gif[/img]

p.s and now with the new head, it's back to its "raped ape" glory days, even a little better. Note to self : keep it that way by replacing the drive belts at 30k miles or 3 years
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#10

".....but my mechanic has been using Amsoil in his Porsches, his brother's Ferrari , his wife's MBZ AMG...." [img]style_emoticons/<#EMO_DIR#>/huh.gif[/img]

Reminds me of the old English joke "I saw a wreck between a butcher and a plumber the other day... Not very often you see a Rolls hit a Bentley!" [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

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#11

Good one [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img], and yeah, no kidding ..
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#12

Just got home, looked at my oil stock - I'm using mostly Amsoil 5-40, but last change, IIRC, I mixed in 2 Qts of Amsoil 10-40 as well.
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#13

Interesting thread. As I stated in another thread about oil, objective data on the subject is very hard to come by, because there are so many variables. But Dan's experience is a very good testament to the durability of modern (if you can call a 944 modern) engines, even in the face of some mighty adverse conditions. I think we can all stop stressing over zinc and phosphorous levels, oil brands, viscosities (within a reasonable range) and change intervals, within reason.
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