Ok, anyone who knows about this motor knows it is the worst ever. I learned this the hard way. My question is if I should switch oils. (I change it personally every 3500-4000 miles) I know about the sludge problem but I haven't noticed anything yet, which I'm sure by the time I do it will be too late. I currently use Pennzoil High Mileage 10w30. I know it has a slight issue with oil pressure so I make sure I use the puralator oil filter. Should I go with a 10w40 HM or higher? Someone even suggested using 4 quarts of 20w50 and 1 quart of lucas oil treatment. A few things to take into consideration is that I live and travel in the Southeast (Louisiana to Georgia.) It's about to be winter so I know this would make a thicker oil slower on those cold mornings. I know I have oil leaks and for now all I can do is keep an eye on my oil level because I don't have the money to fix it permanently and personally I don't believe it is worth it. Thanks for all your help.