Engine oil and gearbox fluid
The issue with diesel engine oil is not just about lubricating the bearings.
Diesel fuel is defined as light oil. And engine oil is also an oil. The problem being is that some diesel mixes into the lubrication oil. This dilutes the lubrication capability of the oil. Hence why it's best to change your oil more frequently.
And don't count on manufactures, whose higher priorities can interfere with long life. For instance, Toyota's 300 series recommends for Australia a 5w-20 engine oil. Which is not suitable for hard hot conditions while towing. Why do Toyota do that? Well, they want low pollution, and good fuel economy from official testing. They also say change at 10,000 KM, but if severe conditions (such as hot weather or towing) change at 5,000 KM.
So IMO Defender owners should change every 15,000 KM.
To remind owners - my D4 manual says change the transmission fluid at 217,000 km. Which is ludicrous - but the warranty for my vehicle expires (excluding age) at 214,000 KM. So when selling a vehicle, the service costs looked lower because the transmission fluid did not have to be included.
At a Land Rover club meeting years ago, we went to A&B in Dandenong Melbourne (they have a similar operation in Sydney) and they repair ZF gearboxes 9they have all the German ZF equipment to do so). They ridiculed Land Rover for the auto transmission service schedule. And when my vehicle was at less than 50,000KM, I asked my dealer for a price to change the transmission fluid. They quoted me $3,140. At 70,000 I had it changed by A7B, for $800, and I got a full report on the gearbox.
Don't listen to official recommendations. The issue though is whether a dealer would change the motor oil for the same price as a Land Rover Indy, because the record of changing the oil might be used by Land Rover if something goes wrong. Hopefully a dealer would change the fluid for a reasonable price.
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