i have an 03 plate IS200 (owned since new).78,000 miles; it has suddenly started to burn oil, emmitting a white cloud intermittently on acceleration. just prior to emmission, you hear a ticking noise, from under the vehicle which seems to be coming from the CAT.
Have completed a full top end service, flushed and replaced oil, changed plugs, changed coolant but the problem is still there.
compression was low on one cylinder but this returned after service to close to optimum
on a process of elimination and before any "open heart surgery" I wonder if there could be anything else that i should look at that i have missed
any help or advice would be greatly appreciated