Hi Larry,
Re: the blocked drain issue mentioned already - it can also leave you with a couple of inches of water in the battery compartment (in the trunk) which will also cause the amplifier in there to have a serious meltdown - if you've got the DSP amp (premium sound), that's about $1250 from the stealer for a new amp... check in the battery compartment soon just to see if there's any sign of minor leakage - the amp is pretty easy to take out, and if there's any green corrosion on the heatsink (which sits at the bottom), then the issue may be slowly building up and needs looking at asap even though there is no standing water. Hopefully all is good in there so all that you need to do is get on top of the maintenance/prevention of the roof drains and there's a tutorial on here. Also, check to see if your third brake light is cracked (our produciton year had a Service Bulletin for incorrect bolt/spring tension) - if cracked, it will also let water in the trunk and you need it sealed tight to handle the Florida summer storms! Search on here for the SB and it will give the part numbers for the new springs/washers. Let me know if you need help.
We bought our one-owner 2003 Z4 about 2.5 years ago when it also had about 13k miles on it. Because it was too old for CPO at that time, we got 30 days warranty on it. During that time, they had to fit a new MAF sensor (check engine light started coming on regularly once I started putting some miles on it - saved about $750). Also, the door seals had compressed so there was some whistling at high speed (I was being very fussy whilst having 30 days!) - they replaced them, but BMW do have shims available if you're paying and need to fatten 'em up a bit! I was worried about what else might need working on after the 30 days ran out, but nothing else needed doing that they hadn't done already (battery, fluids and a few belts). I'd check the belts & fluids just because standing around probably hasn't done them much good, and the heat in FL does you no favors with anything made of rubber!
Biggest thing that put a smile on my face was when the OEM Bridgestone tires were worn enough to justify replacing them - after a lot or research (and a desire to stay on run flats which is not everyone's choice), we ended up on the Michelin PS2 ZP's which completely transformed the Z... no more tramlining, a lot quieter and much tighter steering feedback - the difference was unbelievable and it was like a whole new car. Only (minor) downside is that the side-wall on the Bridgestone had a wide shoulder which almost overlaps the rim of the wheel giving you a lot of protection from kerbs. The Michelin doesn't have that so just watch those kerbs! Plenty of info on here if you want to move away from the run-flats.
If you start getting funky things going on with the electrics anytime soon, the battery is likely due for a change. It seems to affect things in lots of strange ways that you wouldn't necessarily expect... could be worth you looking at when yours was manufactured whilst you're in the trunk checking for water and maybe just change it out now if it's old (or even the original).
I live in Florida also (Sebastian) and the sun starts taking it's toll VERY quickly if you're parked outside at work during the day. My rubber mouldings around the windscreen are pretty much split everywhere now and I've got replacements on order. Also, the roof fades quickly in our heat, so get that UV protector spray all over it, or get a simple cover maybe - mine is garaged at home so it is just being parked up in the week that's killing it... our roof fabric is quite a few shades lighter than it was because I really can't be bothered with a cover every day! You can get the custom interior sun shade for about $50 from BMW and that is a must. Part Number is 82110417516. When I do park outside where there is no shade, I leave the Z parked facing into the sun with the interior sunshade in place - I figure it's a lot easier to replace the rubber mouldings on the front of the car than the rubber around the rear window.
Just one word of caution with the sun shade - it doesn't protect the rear-view mirror from the sun and after about 18 months of owning the car, the fluid bag leaked inside the auto-dim mirror so I'm adapting mine with a flexi section to go around the mirror. Fortunately, it didn't leak into the interior and I got the mirror repaired - there's a couple of places that do a good job for < $100 (instead of $500+ from BMW). If you do need any new parts, getbmwparts.com is a good place for a 20% discount - it's actually a dealer in another state. They do charge about $15 shipping so it's only worth it if you're spending > $80.
Few final things I've learned (some from here, some the hard way!) - the gas in FL is terrible - I now mostly fill up at Chevron (highest octane) and I buy a stock of the 20oz Techron additive when it is is BOGO at Advanced AutoParts (which is often!). I add a full 20oz bottle maybe every 4th tank and you do notice an improvement, especially if you've been using crappy gas. They usually have good offers on the Mobil 0-40 Euro blend oil too... and you can usually get a few freebie MANN or FRAM oil filters when you buy a few cases of the oil... you need 7 quarts on the change, and the MityVac 7201 is awesome for the oil changes given that you access the filter from the top. My Z4 is the 2.5 so please double check quantities etc for your 3.0!
I think that's about it for now. You'll love the Z4 - especially in Florida! Just stay on top of the few things mentioned and you should hopefully stay pretty much trouble free. No doubt with a 9 year old hardly used car, there will be a few teething items to take care of as well as the fluid/belts/roof drains now that it's being driven, but other than that you should hopefully be pretty much trouble free! I've never had the steering issues, so hopefully the intense sun is working in our favour for something - other than making batteries last for ever and making the car look great in photos!! Show 'em if u got 'em!!
Congrats!! Nick
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