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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-17-2005, 08:49 AM   #1
hemant
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Oil change (from regular to synthetic)

Hi folks, I got myself a 99 BMW 323i before a couple of weeks. Looks like the previous owner has been using regular oil in the car and I would like to switch to synthetic. I've heard that one should gradually shift to synthetic by using a regular + synthetic mix for a few times before using full synthetic. May be you guys can throw some light into this, what should be the proportion of the mix and how many times and how often should I do this before switching to full synthetic.

Considering the cost, I guess I'll DIY. I was thinking about using a oil pump extractor but was unable to locate a store that sells one. Has anyone purchased it from the local stores and how much does it cost?
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Old 11-17-2005, 08:53 AM   #2
hamann99
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I have no idea what's going on, but all e46 should've came with synthetic to begin with. Mine did. If the previous owner was dumb enough to use mineral oil, then I really want to slap him for being that stupid. Only thing I can think of now to going back to synthetic si actually flushing the system first with synthetic oil and then do it like a regular oil change.
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Old 11-17-2005, 08:54 AM   #3
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oh and as for a pump extractor here you go www.griotsgarage.com you'll find it on there.
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Old 11-17-2005, 09:05 AM   #4
Canuck328i
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I have read that synthetic and mineral oil should not be mixed. I'd suggest going straight to the synthetic oil - if you really want to be safe, do another change maybe 500 to 1000km later. That might be overkill though.

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Old 11-17-2005, 01:00 PM   #5
hemant
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Quote:
Originally Posted by hamann99
I have no idea what's going on, but all e46 should've came with synthetic to begin with. Mine did. If the previous owner was dumb enough to use mineral oil, then I really want to slap him for being that stupid. Only thing I can think of now to going back to synthetic si actually flushing the system first with synthetic oil and then do it like a regular oil change.
How do I flush the system? should I do it myself.
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Old 11-17-2005, 01:34 PM   #6
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i would call a bmw shop (not a dealer) and ask them what they think is a good idea
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Old 11-17-2005, 03:07 PM   #7
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It's not really going to be a problem. When you do switch from synthetic back to non is when you'll have problems. It's hard to explain why, but basically the seals get use to the synthetic and when you go back sometimes they bust causing leaks which then creates the problems. Hope i've helped you some.
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Old 11-18-2005, 09:36 AM   #8
Tom Busby
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Oil is oil when you put it in; the difference is that synthetic lasts longer, all other things being hypothetically equal as to detergent level, initial viscosity and viscosity extenders, etc.

Check out bobistheoilguy.com for actual tests and a much more scientific explanation.
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Old 11-18-2005, 09:41 AM   #9
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Is Mobile 1 Synthetic a good choice for our cars?
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Old 11-18-2005, 03:06 PM   #10
deutsch325
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Originally Posted by PYRITE
Is Mobile 1 Synthetic a good choice for our cars?
ONLY the 0w-40 grade
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Old 11-19-2005, 03:00 AM   #11
still
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i used 10w40 Castrol full synthetic,on my 63k miles 01 325i.. is that bad?
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Old 11-19-2005, 03:18 AM   #12
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Quote:
Originally Posted by still
i used 10w40 Castrol full synthetic,on my 63k miles 01 325i.. is that bad?

Make sure the oil is BMW LL approved. Look on the back of the bottle for "BMW Longlife 01" approved
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Old 11-19-2005, 11:07 AM   #13
hemant
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Quote:
Originally Posted by rooneym
Make sure the oil is BMW LL approved. Look on the back of the bottle for "BMW Longlife 01" approved
Ok, so I guess I'll buy the PELA oil extractor and change oil (Mobil 1 OW 40) once now and again after 500/1000 miles.
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