I banged my 98 XJ 4.0 off the rev limiter constantly for the last 240k of it’s 453k miles. I think it still leaked more than it burned ever. It was quiet right up to the end when l shipped it to the knackers.
l drove all my 4.0’s the same way and never had a problem. Always used Castrol 10/30 mostly sometimes 10/40 if it was a hot summer. Either in the white, green or black syntec. Depending on how flush l was at the time. Always Castrol though. I’ve never lost an engine in 40 years. The chassis’s always wore out first and they almost always were high mileage used vehicles.
Keep oil and coolant in it and it’ll treat you well.