Originally Posted by N8N
Personally I don't think that the color of the oil at change time is so much an indication of the quality of the oil but of the filter. If you haven't changed the filter that you're using I'd be worried that all the stuff that isn't making your oil dirty is sludging up your engine... I was thinking of getting one of those Canton/Mecca filters for the heep because I like my stuff to last forever, but unfortunately I just spent the money on new rods and mains instead :/ (only had it 2K miles, changed the oil, and now it's knocking?) I guess if my crank looks too bad or if new shells don't quiet it down I will be looking at a rebuild.
But anyway to the question that was asked, I've always been told that using a HDEO like Delo or Rotella is the way to go; I worry a little about using a SAE 40 oil in an engine that recommends SAE 30 (the second number is the one that really matters, the first one affects cold startup and essentially lower is better, within reason - but that's a whole 'nother discussion, and mistrust any non-synthetic that has a lower "W" viscosity rating than 10W30 or 15W40... viscosity improvers will break down before the oil will... but synthetics are naturally more viscosity stable than conventionals so things like 5W40 are possible)
I probably will use the 5W40 in my own engine, it's already knocking on 10W30 and I've got a whole stash of it in my storage locker that was intended for a Studebaker engine. So at this point it can't hurt...
Rebuild needing a new crank? Look on jeepstrokers as the mini 4.2L stroker builds
The 232 crank is used, and all thats needed after that is a set of pistons..around 200. Cranks abuot 150, it'd be the best to do, get some more low end. I'm doing this build currently! About 800 in it so far, and its almost done!
I run Bosch or Mobil 1 filters. Yes I change it everytime I change my oil...seems like you thought I was running just 1 filter continuously right?
I know its not the best way to judge oil by color, but the point does stand, that while running Delo or Rotellla to 4500miles its still clean as hell, but while running Mobil 1 it was flithy black at the same 4500miles.
99% of the time I run Bosch filters, if I can't find the right Bosch then I run Mobil 1. Jeep is daily driven to work and leasure..
So there would be no changes as to how its run, how long it was run and what was filtering it..the Mobil1 just got dirty quicker!
Rotella & Delo both have cleaners in them..detergants. It will litterally break down the sludge/gunk built up..