Slant Six Oil light coming on — need a new pump?

Another sludge cleaning method I used is as follows:

Buy your favorite 100% synthetic oil (I like Mobil1) and favorite filter (Wix or Puralator) along with 3Qt Marvels Mystery Oil.
1. Change oil and filter
2. Add synthetic but replace 1 quart with Marvels.
3. Run at IDLE or slightly more for 10-15 minutes ensuring car is fully warmed up. Do not drive it or get rev-happy.
4. Drain while hot and replace filter at the last change.
5. Repeat 2 more times.

If its the sludge issue noted, the oil will go in nice and transparent and come out black or chunky. If its worn bearings, this will not help you other than making the inside nice and clean.

You can do the same with DexMerc3 as it is high in detergents, but I find the Marvels is more aggressive and can move that sludge.

Good luck.
RGAZ