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Old 09-06-2008, 02:59 PM   #1 (permalink)
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Question about Synthetic Oil?

I've been wanting to start using synthetic oil ever since I bought my car back in January 07'. But I was not sure if I should, because I heard somewhere that, if you are not sure if the previous owner or owners used synthetic or conventional oil you should stick with conventional, especially if the vehicle is an earlier model. Something about the synthetic loosening engine gunk...... You would think as an ex mechanic I would know the answer to this question, but my days as a B-tech. ended in the early 90's not sure if many people used synthetic back then....So has anybody switched from conventional to synthetic without experiencing any problems, I'm sure its not a big deal, but what hell......
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Old 09-06-2008, 04:23 PM   #2 (permalink)
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hmmm.... i don't know exactly how it all works, but i thought all bmw's use synthetic from the factory. I use synthetic for my car, but as far as i know, it had always used synthetic. you might be able to call any BMW dealer and just ask them. I am sure they would tell you.
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Old 09-06-2008, 04:36 PM   #3 (permalink)
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I think bimmers started using synthetic across the range of all vehicles in about 1998. In any case, the problem is that the smaller molecules of the synthetic oil will trash your seals if they've been broken in with dinosaur oil. If you're not sure, just get really good dinosaur oil and it'll be just as good as the synth for your car.
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Old 09-06-2008, 05:31 PM   #4 (permalink)
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I think bimmers started using synthetic across the range of all vehicles in about 1998. In any case, the problem is that the smaller molecules of the synthetic oil will trash your seals if they've been broken in with dinosaur oil. If you're not sure, just get really good dinosaur oil and it'll be just as good as the synth for your car.
T-Rex oil, thats funny...... Good T-Rex oil.....That's what I have been doing,
thanks Prof............
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Old 09-15-2008, 03:14 AM   #5 (permalink)
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i don't know man, i think bmw has pretty tough seals if you ask me. I've switched from dino oil to synthetic with no problems. that synthetic really cleans up the engine an makes it run sooo smooth.
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Old 11-16-2008, 02:03 PM   #6 (permalink)
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You could always go the route of a synthetic blend. You will have about the same affects as full synthetic but not the cost of full synthetic. And you can always go back to regular oil, if you need to. I've been using it in my wifes Audi A6 and the car has never once given me any problems since I've changed it to synthetic blend, and the car has over 126,000 miles and still running strong.
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Old 11-16-2008, 02:34 PM   #7 (permalink)
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I say if you've been doing fine with dino oil, stick with it. No reason to switch to more expensive synth.
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Old 02-13-2009, 08:54 PM   #8 (permalink)
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Johnny, seeing as you live where it gets cold and you start it in winter, you'd be better off with the synth. It flows better in the cold so it protects better. I've been running 10w40 Syntec since last April and it never missed a beat, even at -18F. I'd probably run Castrol Edge if they'd sell their 0w-40 in the states.
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Old 02-14-2009, 07:26 AM   #9 (permalink)
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my car needs half-synthetic 10W40
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Old 02-27-2009, 06:18 PM   #10 (permalink)
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The way i see it just switch to synthetic... worst case senario is you might have some oil leaks in that case i say the seal was on its way out anyways... its kind of like people refusing to use engine cleaner because the carbon buildup gives them better compression, that is true, but if your engine is holding up on carbon deposits then its time to rework that engine....

Use the switch as a sort of test, if you leak, your engine needs a couple things... if not then your engine still is kicking without missing a beat...
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Old 09-08-2009, 05:32 AM   #11 (permalink)
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Damaging your seals is an old wive's tale...and, more importantly, they say not to go back to conventional oil after using synthetic, not the other way around. So, regardless, you're safe. Go with synthetic, somehting like Mobil 1, is a good choice for European cars and especially if your car is getting up there in miles. Most of the time, the synthetics are deseigned to repair damaged and worn seals so you won't start leaking anything.
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Old 09-08-2009, 04:07 PM   #12 (permalink)
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My bmw shop recommends sticking with the regular oil on pre 1998 models. I am originally from ny/nj and i never had a problem with regular oil.
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Old 09-20-2009, 10:40 PM   #13 (permalink)
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I think bimmers started using synthetic across the range of all vehicles in about 1998. In any case, the problem is that the smaller molecules of the synthetic oil will trash your seals if they've been broken in with dinosaur oil. If you're not sure, just get really good dinosaur oil and it'll be just as good as the synth for your car.
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Old 10-10-2009, 05:59 PM   #14 (permalink)
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Thumbs up Amsoil rocks

Amsoil outperforms Mobil 1 all the way across the board, and is made in America. Cost-wise, 5 quarts is around $48, but with filter changes @ 5K will run 25K miles before recycling. Oil analysis is cheaper than oil changes, and tells you more about the shape of your internal engine components. 100% synthetic is the way to go. Amsoil also has the 0w40 for your brand new BMW.
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Old 10-10-2009, 07:29 PM   #15 (permalink)
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Amsoil outperforms Mobil 1 all the way across the board, and is made in America. Cost-wise, 5 quarts is around $48, but with filter changes @ 5K will run 25K miles before recycling. Oil analysis is cheaper than oil changes, and tells you more about the shape of your internal engine components. 100% synthetic is the way to go. Amsoil also has the 0w40 for your brand new BMW.
Man, if it was liquid gold, I wouldn't leave it inside my engine for 25k.
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