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Old 06-17-2011, 01:29 PM
 
Location: Pikesville, MD
5,229 posts, read 11,495,564 times
Reputation: 4846

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Quote:
Originally Posted by McGowdog View Post
You don't really want to buy a BMW anyway, do you? You know what it stands for?

Bite My Weinie. Big Money Waste. Beats My Wife. Break My Windshield. Behold My Wheels. Backwards: Wanted Mercedes Benz.
I've got 185k miles on my BMW. 5k-7500k oil change intervals, castrol GTX oil, OEM filters. Daily driver and one of my favorite cars I've had (out of the hundred plus I've owned in the last 30 years). Had it for 5 years so far and fully intend on having it for another hundred thousand miles. It's only cost me $1800 in repairs in that time.
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Old 06-17-2011, 02:32 PM
 
Location: Toledo
3,861 posts, read 7,419,971 times
Reputation: 3646
So what's a person supposed to do if they only average 7,500 ot 8,000 miles a year? Are they supposed to change the oil evey 3,000 miles or should they change it more often? I know what what my dealership wants, but I wonder if it's really neccessary to change your oil every 3-4 months.
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Old 06-17-2011, 02:55 PM
 
Location: Keosauqua, Iowa
8,881 posts, read 15,649,371 times
Reputation: 11460
I've never paid attention to the "3-4 month" interval. I've got an old truck that we only use to haul things that we just drive maybe 1000 miles a year. I change the oil once a year at around Thanksgiving time (don't ask me why) because it sits outside and we live in an area of extreme temperatures in both winter and summer.
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Old 06-17-2011, 05:04 PM
 
Location: Victoria TX
42,668 posts, read 71,603,351 times
Reputation: 35875
I'm going to make up a formula off the top of my head, and see what you all think of it.

Estimate how many cold starts you make. Cold start defined as restarting the car after the engine temperature has fallen to ambient temperature, probably several hours.

The average driver starts his car 500 times a year, and drives 10K miles per year, so lets say 250 starts and 5,000 miles reaches the recommended change interval. If you double your cold starts (500), your oil should be changed even if you've driven only 500 miles.

So count 20 miles per cold start. Multiply your cold starts by 20, and add your miles driven. Change oil when that sum reaches 10,000. It could be 500 cold starts and almost no miles, or at the other extreme, 10,000 miles on just a dozen starts, east coast to Alaska and back on a two-week march of death.

(Note that I said the recommended change interval is 5,000. That's what your car manufacturer says. Only the people who sell you oil say 3,000. Guess why?)
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Old 06-18-2011, 08:33 AM
 
Location: Toledo
3,861 posts, read 7,419,971 times
Reputation: 3646
The cold start formula makes sense. Using it I would need to change my oil every nine months or so. Right now I usually stretch the four month interval. I'll still need to change at least every six months just in case I need repairs that are covered under the warranty.
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Old 04-13-2015, 09:15 AM
 
Location: Columbia, SC & Augusta, GA
899 posts, read 638,635 times
Reputation: 1004
My 1981 Cutlass's 3.8 V6 needs an oil change, but I haven't gotten around to it yet. It can take it...it's a Buick V6...
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Old 04-13-2015, 01:25 PM
 
Location: Keosauqua, Iowa
8,881 posts, read 15,649,371 times
Reputation: 11460
Quote:
Originally Posted by Dburger View Post
My 1981 Cutlass's 3.8 V6 needs an oil change, but I haven't gotten around to it yet. It can take it...it's a Buick V6...
Thanks for reviving a thread that was started in 2007 and died in 2011 to point that out.
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Old 04-13-2015, 01:36 PM
 
10,683 posts, read 17,039,508 times
Reputation: 10116
Quote:
Originally Posted by duster1979 View Post
Thanks for reviving a thread that was started in 2007 and died in 2011 to point that out.
Actually it was revived by a spammer which I reported. Spam post was removed but the thread was still bumped to the top.
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Old 04-14-2015, 12:46 PM
 
2,575 posts, read 1,045,074 times
Reputation: 1710
Quote:
Originally Posted by MissShona View Post
Sorry...but I guess I'm going to bust the myth here. With my last car, I went 3 years (so maybe 50K miles) without an oil change. Hmmm...I'm not really "proud" of that. But my engine didn't blow up or seize or anything like that. It ran perfect engine-wise...until it was totaled.

Of course, I would put more oil in it though.
I also have gone over 40,000 without an oil change. Never had a problem. Not proud either.

ETA: Didn't see it was old
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Old 04-14-2015, 03:32 PM
 
48,519 posts, read 81,076,846 times
Reputation: 17978
Well you can do a search on what happens if you do not change oil in a vehicle really. I saw one with teardown of engine change at various mileage schedules some years ago. The excellent photos showed the difference.
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