E30 Factory manual pinout and illustration showing the routing of the central locking system found on E30’s:    
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Directly from the factory repair manual:
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If you’re anything like me, before jumping into a job, or while ordering parts, you want to refresh your memory by looking at the area you are going to be working on. Problem is, with an E30, getting clear pictures of the underbody or stripped back engine bay or interior is fairly difficult. Luckily...
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Ever wondered if there is a place where you could find BMW parts that are coming out of being NLA? Good news, BMW is now running the below page with just that information! https://www.bmwgroup-classic.com/en/offers-and-services/bmw-classic-reproductions.html
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The E30 cigarette lighter socket is a bit of an oddity when it comes to retaining a lot of different accessories. They usually wiggle their way out after a few miles or tilt and disconnect. Search no more though, these two are confirmed to fit well and snug: Information regarding the magnet phone hanger...
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Understanding battery group sizing can seem confusing, but it really comes down to regional nomenclature. Like metric and imperial there are DIN sizes (Deutsche Internationale Norm) and BCI (Battery Council International) group sizes. What’s convenient is that most BCI sizes have DIN equivalents and vice versa. Some makers will even place both designations. 40R...
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You’re more likely to get a bad balance than you are a good balance, and it all comes down to the operator and sometimes the accessories they have to work with. The golden rule to a good balance is repeatability; and that doesn’t mean just re-spinning. After a balance is confirmed the wheel needs...
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Interacting with your phone whether its for GPS or reading a message is so much easier when the phone is dashboard level rather than trying to interact with it in the E30 cubby under the HVAC panel:
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When new the M20B25 E30’s were rated at 18 city / 22 Hwy MPG: Taken directly from an windows sticker:
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If you’re looking for a new exhaust for your E30, and in particular an exhaust that sounds and functions similar to stock, but has the benefits of stainless, than you’re in luck. The Ebay, Ireland Engineering, and a bunch of other esque websites sell a stainless steel catback system that are identical in every...
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