ColinBarber

Interesting, as only the F-Sport and Premier should have that auto mirror at that age. Could have possibly been added later I guess. What month in 2013 was your vehicle registered? The ML audio is nice - uprated amp and 13 speakers.

They aren't the same engine but from the same family. The IS has direct injection and makes more power. It doesn't therefore have to rev so much, although I'm sure part of the revving is the transmission software on the NX - it shouldn't have to rev as much as it does.

That is really the same for all vehicle. Engine modes don't make the mixture lean/rich as they all need to achieve the optimum requirement for the cats. Dulling the throttle repsonse can save fuel but you can achieve the same thing by being careful with the throttle. Changes to the transmission alters economy, as you say holding on to a gear for longer will typically use more fuel. Only on newer vehicles does the drive mode affect other things too, such as putting the AC into economy mode.

I'd say your braking experience is abnormal and may well be related to the warning you received. Something isn't working as it should.

Well I also quoted Go-LPG where they state cylinder head temperatures are higher. This what can damage non platinum and iridium plugs. This is kind of moot though, Lexus vehicles will typically have those two types of plugs and so LPG will work fine with what comes out of the factory. Just don't fit cheap basic plugs, but then I wouldn't recommend them even if you weren't using LPG. @Bluesman I'm really not sure why you give any special credibility to having a BSc (Hons) degree. What subject was it in, what grade and when was it obtained - it could be in a completely irrelevant field or too long along to provide any value to the discussion in hand. Not sure anyone is disputing that fact that LPG only contains 85% the energy of petrol, but that isn't the only factor that affects the environment the plugs are subjected to. The speed of burn is relevant.

They look tilted to the right to me in the ebay photo but possibly the angle of the photo. Weird that it is wrong, the whole point of those vents is to defrost the side window and on all other Lexus models they direct the airflow correctly. Good that there is a simple fix though.

Sorry I don't have a wiring diagram for your model. Given that work was recently done on the vehicle, have you checked the wiring at the transmission and ECU to make sure everything is seated correctly?

The RC F and GS F are worse, they use a different compound to the IS F which has more metal in it. There is a TSB for the RC F where Lexus will change the pads for a different compound, but it will reduce performance slightly (which shouldn't be an issue unless you are using the car on a track).

Even that is expensive https://www.ebay.com/itm/GENUINE-TOYOTA-LEXUS-FRONT-STRUT-TOP-BEARING-OEM-90903-63014-/321667335074 or third party even cheaper: https://www.rockauto.com/en/moreinfo.php?pk=3089091&cc=1444314&jsn=337

The manual transmission requires 1.8 litres of 75W-90 API GL-3 oil. I've used Redline MT90 oil before in manual gearboxes to improve shifting. The diff needs 1.05 litres for non-LSD or 1.0 litres for LSD of SAE 90 API GL-5. If using a synthetic oil, such as Redline, and you have an LSD then make sure you get one that is compatible. SAE 80W-90 is only required for climates that drop below 0 degrees Celsius.

Are they all like this or do you have a damaged or incorrect vent? This one looks correct and will direct air to the window. https://www.ebay.co.uk/itm/Lexus-IS220-IS250-O-S-RH-Driver-Side-Front-Dashboard-Air-Vent-55650-53031/222957280186?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D49131%26meid%3D98ffd2fb8bc448e8a19924f93dda26e6%26pid%3D100005%26rk%3D5%26rkt%3D11%26sd%3D182952212407%26itm%3D222957280186&_trksid=p2047675.c100005.m1851

You don't have to agree but it is a fact.

Belt should have been changed at 100k miles, and ideally the water pump at the same time as a precaution. Underside corrosion and water leaks in the boot are two things to watch out for.

My GS F is doing a good impression of a London taxi at the moment, driving me mad Will need to change the pads to something that isn't just sheet steel.

see towards the bottom of the first page in this thread:

It usually either incorrectly reads a number , or correctly reads a truck with a speed in km/h, when it gets it wrong. I've a sign near me in the 30 limit which is facing the other direction, every day the camera picks it up as a circle with a line through it (the pole) and displays the national speed limit sign. Obviously this should only be used as a guide, it is the drivers responsibility to know the speed limit they are driving in at any moment in time.

There is no series III RX350 in the UK, only ever a 450h hybrid. The series IV had the 200t option, but that isn't available for a £17k budget, and doesn't really better the 450h for mpg on the motorway.

What other version is there?

Not seen in person but it seems to work quite well in the video. The carbon is normally 'very in your face' with high contrast colour differences but it is more subtle against the silver. I guess it depends on what statement you are trying to make.

I owned an F Sport for over three years and had a couple of Premier loan vehicles - they definitely are more comfortable and probably a good compromise. The 17" wheel models improve things further.

This isn't really true. Heat is released more quickly so cylinder head temperatures are higher with LPG compared to Petrol, hence why plugs don't last as long, especially non-iridium ones.

Get something with 17" wheels, possibly even 16". 18" wheels + F Sport suspension is not taxi comfortable.

MR2 MK1 - Awesome cars

That's fair enough, but if your plugs don't need changing and you have an LPG conversion then I wouldn't recommend changing them because you need LPG plugs.

Welcome. Hopefully someone can answer your question however you may get a more regional response if you register and post on our Australian forums: https://au.lexusownersclub.com/forums/