The o ring under the manifold has been an issue with all 8 PSI units that I have. Also have had a water pump go at 2000 hours, Now have 4 units faulting rich at 1800 to 2300 hours. Not impressed with 0 clearance engine design. Just a modified Mitsubishi 2.6 litre as found years ago in K-cars and mini vans. Would have the old Mazda back any day as they were bulletproof. And how about the fan belt with no tensioner. Just stretch it over the pulleys.... and Hyster says replace it everytime you remove it. As you can see... so far not impressed