[gaijin]

I did the google search on the 1MZ-FE and Sludge and u suggested, and I discovered you are right —the sludging is apparently a very broad problem.

For the 3k mile OCI’s what conventional oil subtype should I use with the 20% Marvel..?

20w-50...? I need something thick.

[rapture-me]

You only need the thicker oil if your engine bearings are worn badly. This is usually the cause of low oil pressure. However, the thicker oil could be a detriment in cold weather. Best bet would be to check the pressure with a gauge.

[onona]

Take the car to the junk yard. Take what they give.

Go buy something reliable.

Or do everything Organic Panic and Dr. Bogus says.

Either way, my prayers are with you.

Keep us posted.

[ebshumidors]

I think it calls for 5w-30. I’d stick with that. I took an engine apart for that. Lotta work, but ran great.

[Clay Moore]

You might consider running a diesel oil. It has a higher detergent content and will gradually break loose the sludge.

My guess is that if the oil change and oil pressure sender happened at the same time and you still had a low oil pressure problem, you likely have significant bearing wear that will only be temporarily patched with heavy oil, assuming you can get the sludge blobs out.