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The engine oil level in my 2023 LDV T60 Max is always over full and has been changed three times. But every time, after 6000km of driving, the oil level will be about 18 to 20mm over the full mark on the dipstick. I cannot get any satisfaction from the dealer. I think it must be diesel getting into the engine oil.
It sounds very much like you’re on the right track in thinking that the problem is diesel finding its way into the sump and increasing the level of the sump’s contents. This is a reasonably common problem (and not limited to LDV vehicles by any means) and occurs when the vehicle attempts to force a Diesel Particulate Filter (DPF) regeneration. To achieve this, the computer instructs the fuel system to inject extra fuel (diesel) into the engine to try to get everything hot enough to perform the regeneration. And sometimes, some of that extra diesel gets past the piston rings and into the sump.
The problem, of course, is that a mix of diesel and oil is not going to lubricate the engine as effectively as oil on its own. So, you’re running the risk of engine damage by having this situation continuing to occur.
If the dealer won’t play ball, go over their head and talk directly to LDV Australia’s customer service department. This is an obvious warranty issue and LDV is legally obliged to address it.
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