Which gasket do I replace it with (avoiding the cheap ebay ones!!) ? If you uses the uprated 2 part MLS gasket do you also need to uprate the oil rail ?
Or do I go for a standard Payen BW750
You have 3 basic options for the new gasket:
1. The standard SLS (elastomer) gasket - make sure it is one of the newest design which has a reinforced elastomer bead (the bead has a 'toothed' appearance along its edge); there are still a lot of the earlier design gasket about on which the elastomer beading is smooth). (The most common time for the original gaskets to fail is around 70000 to 90000 miles, and there is no reason why a replacement shouldn't last a similar time - potentially the replacement could last to 140000 to 180000 miles on the clock - by which time the rest of the car may well be at the end of its time anyway?)
2. The original design MLS gasket set (sometimes referred to as 'the Land Rover gasket'. This can be fitted without the stronger oils rail (although some mechanics do recommend its use). There have still been a few repeat failures with these however, which may be down to poor fitting or the cause of the original failure not being rectified. It is also possible that if the liner 'stand proud' is significantly below the recommended height or is uneven, the MLS type may not be as effective because the steel gasket isn't able to compress to take account of this in the same way as the elastomeric one.
Both the above use the original spec bolts tightened in sequence to 20Nm + 180 degrees + 180 degrees.
3. The XPart/MG Motor so-called 'ultimate fix' MLS gasket kit (ZUA000530); this is very similar to the other MLS, but has no fire rings and is all in one piece (no seperate shim), and only comes in a kit with an uprated oil rail and higher tensile bolts, the whole of which XPart say must
be used. The higher tensile bolts in this kit have a different tightening proceedure from the other gaskets - 20Nm +180 degrees + 135 degrees. It is also very expensive at about £220 for the kit (which only comprises the MLS head gasket, the bottom oil rail and the bolts)