The gearbox on these things generally cops some flack for giving out on 4th or 5th especially if they do a lot of towing. Half a litre more than recommended transmission oil solves this as it's caused by those two gears sitting high in the box and getting hot due to minimal contact with the oil. I'm not sure about the 3 litre in these, the older 2.5 is an absolute rocket but was prone to warped or cracked heads or headgaskets
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