I have a friend who owns a 2002 Chrysler product with the 2.7L engine, my understanding is this engine is prone to sludge issues, and I want to help him out. The car only has 50,000 miles on it and is used for short trips mostly, so I’m worried that it probably does have a sludge issue brewing. I use Delo 400 synthetic in all of my vehicles, unless I’m able to find chevron Supreme Synthetic or Havoline synthetic. My question is what would be the better easy to obtain oils for his vehicle? I’m looking for synthetic oil that will possibly help clean up his existing sludge if it is in fact in there, plus help prevent future issues. From what I read on here treatment with the Auto RX will be suggested but his budget is super tight, and just moving up to synthetic will be pushing his budget, so that’s not an option right now. If it was my own vehicle I would use Delo 400 Synthetic in 5W-40, but it’s not my vehicle so I’m looking for suggestions in the “proper” viscosity ranges.