Hi I've a 2000 disco v8 with lpg I've started to get tapping noise on acceleration only from os rear of engine I'm just about to change offside manifold gaskets to see if this helps .but I've also seen several postings about lifters being gunked up and running with semi synthetic Diesel oil will help this and is better for the v8 engine . Can anyone confirm this . And would I still just keep the normal engine oil filter or would I have to use a diesel filter . If there is a different one that is . Many thanks guys . Bob