Sounds like a change by dilution, so making it hard to get the heavy "muck" off the bottom of oil pan. Always liked the idea of at least seeing what was at the bottom, even though it meant taking off the trannie pan (no drain) and spilling the minimum when releasing the attaching bolts. Still messy when I did it on my Nissan Skyline - don't do it any more on Colorado. Need to have a walk under ramp to have a go now. Getting older and lazier.The dmax has 3 bungs - a filler, a drain and a level check. I've modified a bunnings cheap 5l pressure sprayer to reach the filler. The videos I've watched for a simple change remove the drain, measure the amount dropped (about 3l), refill that amount, go for a drive, repeat the process another 2 times (so change 9l in total), remove the level check bung and replace when the oil is starting to drip (or top up until it does).
The clever guys intercept the oil cooler flow and replace that way