gear oil will bring it up a bit.

keep the jeep plugged in that will help

 

Why are you even using 5-30 anyway they are ment to use 10-30.. ill never understand why ppl do that..

 

It's the same weight warmed up. Just gets up into the motor faster at start up. It seems to have rid me of my cold morning knock I was having.

 

I guess I've always been told to use 5w-30?

But I've also been warned against using 10w-40 in Minnesota winters...

 

I guess I've always been told to use 5w-30?

But I've also been warned against using 10w-40 in Minnesota winters...

Why don't you use 5W-40?

 

I wouldn't even use 10W40 in he summer and follow the spec to use 10W30 year round in all our Jeeps. Always have and always will. And yeah, my oil pressure is just a little low at idle on my 96 4.0 but don't believe it's doing any damage and picks right up when accelerating.

For MN winters believe I'd be using a block/engine heater plugged in overnight if possible.

 

Ok, I think I will go with a 5w for the winters, because it does get well below zero here in Minneapolis. Outstate and northern Minnesota see -40 like your part of Virginia.

I kinda like the earlier idea of 5w-40, but some of you guys seem against a 40w, even with my bad bearings?

And what again does anyone think is the cause of that knocking sound?

 

I started using 5w40 Rotella T6 synthetic just to see if it was any good. It got rid of some noises, seems like good stuff. Oil pressure is pretty stable except at warm-up where it can get somewhat low idling after a stop.

 

I'm also thinking of trying that actually. Thanks!

 

Be gentle to it when it starts. A bit of knocking on cold start is tolerable. A bit of knocking on a warmed up engine is certain death.

Basically run whatever oil you need to keep it from knocking when warm, and live with whatever it does cold. I wouldn't hesitate to use 20-50 if that's what it took to prevent knock while driving

 

Thanks.

I now think the knocking is a lifter, so that's my next thread!

 

Thanks.

I now think the knocking is a lifter, so that's my next thread!

That's called ticking

 

I've been using 10w/30 Valvoline Maxlife and the oil pressure on my 98 ZJ 4.0 is 30 psi hot at idle, 40-50 driving..

 

It is a ticking I realized, and it seems to be coming from the top. A jeep guy I know immediately said it was a lifter.

 

I switched to 10w40 in my jeep for the same reason, it has never ran smoother, no ticks, no cold knock. Then again I live down south so it might effect yours more than mine.

 

a 40W is great for older motors with loose tolerances. The oil helps take up the slack.

 

OMG man I've always had Mobil 1 10-30 or 10-40 Synthetic in mine since it came from the Factory. 170K miles original engine no issues!