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Hi with regard to the flah lube kit the ls 400 does not need it. funny enough the gs300 does some converters insist on installing it though. Another thing is you cant empty the LPG tank as the gas pick up leaves about 8/10 litres in. This will assure others on here when they fill up they only get about 58ltrs in a 67 ltre tank. Put £10 of petrol in at the same time as you wont get the car started if you run out of petrol even when hot.

I've just sold my E39 528 BMW with LPG and loved its low running costs. LPG is harder on plugs than petrol so maybe a change of plugs. Some people like to fit the extra lube as LPG is 'drier' than petrol.LPG evaporates at 30° so your coolant system must be spot on.My BM changed over after ½mile from stone cold. On a big car a big tank makes sense and the spare can still be kept in the boot. If the space is needed, ie, holiday, then temporary roof bars to hold the wheel.Another method is convert a cycle rack to hold the wheel.Modern systems can have the filler under the fuel flap.I believe the regulations now stipulate a certain height and position from the ground. I dont own a Lexus but looking for one with gas.

Thanks Mark - that sounds neat .... but doesn't the LPG tank come with some kind of gauge, or do you have to use the tripmeter as a proxy gauge I did some searching on the LPG forum, but it is so full of detailed stuff, that finding the simple stuff is tricky. Am I right in thinking that you ditch the LS's spare wheel and the guy fits an 84 litre tank in there. Is the fill cap then normally inside the boot (which would be OK). What happens in a motorway shunt? I guess it's all been thought of otherwise people would have been dying in fireballs in their droves. Are insurance premiums normally affected by the changeover to LPG. Thanks Mike Hi Mike You can have a tank in the spare wheel well ( I have) 84 litres is the biggest, you can also have a 100 litre cylinder tank in the boot , so you keep your spare but loose boot space. I have my filler mounted on my towbar outherwise it would have to be mounted on a bracket underneath, or a hole cut in the wing ( must vent to outside & be secure as the pumps have a break off point if you drive off without disconecting. I carry ride on punture sealent an electric pump & a repair plug kit. The lpg system has its own gauge which works on pressure in the tank ( they are not very accurate hence using the trip meter) An lpg tank is safer than a petrol one, If you do have a big rear end shunt & the valve breaks off at the tank end (very unlikely ) It has a break off seal. The tank has a vent off on it, so if it gets hot in a Fire it burns the lpg off that way ( by that stage the car is a fireball anyway. I am a LGV instructor & we do Hazardous goods training Ive seen the test videos, petrol cars become an inferno first, the early lpg tanks from the 70s/80s go bang. the latter systems burn well but at a much latter point than petrol or diesel. On my insurance the premium stayed the same my exess went up by £100. Most companys dont charge anything extra