you could also take off compressor and sell it on ebay, mighy help pay for the springs

Isn't this a Jaguar engine, maybe worth a look on few jag sites

sounds more like stuck caliper either buy a new one or remove free up and give a good clean

i would start with the easy stuff does it have LPG fuel ? then go throu system checking each part of system

Thats could explain my intermittment mis fire when cold which has gone away since i drained the oil to the right level

where can it go ?

i would run on petrol to see if affecting just LPG or both fuel systems. If both when the LPG was installed did they adjust the mix or set up ? LPG does require a good spark so work back plugs leads coils. Hope that helps

agree go for underslung tanks but if ACE has been fitted you may find you do not have enough room. I had it fitted to mine but involved replacing the petrol tank with a smaller version and fitting the LPG tanks along side. LPG preforms just as well as petrol but i could do with a few more...

The only thing i noticed was a slight mis fire which has gone since i drained some off. I did think about leaving it as it does leak a little but saw the message on the drip stick not to over fill as it could cause damage

I put too much oil at my last service approx 2L too much and have run for over 1000 miles before realising. Would this have done any damage do i need to take any further steps (apart from draining a bit off ?) Thanks in advance.

YOu can convert a D3 so should be the same as D4

what you say makes sense but i have had these issues since Feb and no noticeable loss of coolant. Would a compression test prove this one way or another ?

i have put some additional coolant in but very miniual approx mug full in last 3 months. Would a compression test prove this one way to another ?

that sounds expensive, are there any ways of testing for this other than stripping the engine down and removing the heads ?

apply a bit of heat ?