I should have mentioned. I have also replaced the cap. That was initially the first thing I did as it was broken internally

My first thought and the first place I would start is the coolant pressure cap on the reservoir. If this is weak it may be letting the pressure drop which will lead to the coolant boiling or overflowing from the tank. Cheapest part to buy as well and it may just do the job

Hey. Hope all is well? After alittle help. My is250 is Pushing Coolant into the over flow causing it to spill ever so slowly and having to top up coolant every 2-3 weeks. I've emptied the over flow tank & filled up to required level & over few weeks i can see it filling up slowly as I drive & causing it to spill. Ive changed my thermostat about 2 weeks ago, hoping it would have been a fix & today when driving i had no heat coming out off my heater. Got home from work checked my overflow & is not almost to the top which indicates its pushing coolant. Are there known issues that im not aware off? Is it a certain way to bleed these cars? Possibility off a failing water pump? Or am I looking at worst case it being the heads. Any one dealt with similar? Thanks in advance.

I guess car maintenance is pretty much the same to all vehicles of any kind. Check, measure, inspect, top up, etc The Handbook will give you routine maintenance tasks - but most importantly like any machine, inspect everything (e.g. checking tyre pressures also check the condition of them such as uneven tread wear or damage) go beyond the handbook. Listen for any strange noises or smells, etc - use your senses and if you notice something feels or sounds strange then get it checked immediately before it results in a much bigger bill or worse. I'm sure members may add to this list with specific faults and you can search the IS forum threads to see if anything jumps out at you - but try not to become paranoid :-)

Hi John....welcome to the Club Wow! I'm not at all jealous :-( Superb cars, do you take them out much to many events?

Hi, I'm John. I recently bought a 2007 LS460 with a few extras, including a TOMS exhaust, body kit, and 19-inch wheels, and I'm loving it so far. I also have a KE25 circuit car with a 4AGE BT20V running E85, forged pistons and rods, an Autronic ECU, a Holinger straight-cut T50 gearbox, and a T-series diff.

you would have to check with the supplier but the equivalent ones would also be on eBay and the sellers usually list the models they fit - and quality is usually better from a reputable trader

I'm not sure a vehicle of that age had wifi updates fitted but I might be wrong There are aftermarket SatNav update supplier and send out an updated SD card for hardly any cost at all. I have read that some are no good but for how cheap they are its certainly worth trying one