If you suspect the motor may be neglected the only way of knowing for sure is pulling the valve cover to see what the top end looks like.

Either way a good synthetic oil, with reasonable changes say 5k will make the internals of just about any motor look like new after 20k-30k of use.

If the engine is horrible neglected and really sludged up your not going to want to try to clean it, to much of a risk of chunks breaking off and clogging an oil passage. In more extreme cases your better off just ignoring it, I have seen some horrible sludged up motors run just fine for a long time.

Pull the valve cover and see if their really is a problem, I'd also send a sample out to Blackstone to see if maybe their is coolant intrusion.

__________________
2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200