ZR-1 Oil Change

[randy ransome]

My car has been on the lift for about 6 months. I need to change the oil, would it be better to crank it and circulate the oil or drain it as it is?
Something I've never pondered.
Thanks

[Dynomite]

Drain as it is....the oil filter will be empty 👍

And you will get the most old oil removed.......

Depending on the oil filter you use, I usually let it sit for a day or two before changing oil to make sure I have an empty oil filter 👍

[hotroddaddyo]

I would change it on the lift as-is.... whatever oil gravity can send to the pan is already there after this lengthy time. I'd pull the drain plug, and give it plenty time to drain cold. It should drain from pan just fine, given time... maybe a few hours just to get every reasonable drop. This southern summer temperature works in your favor, too.

[randy ransome]

Thanks Folks, I'll let it drain over night. I'm using a AC Delco PF970C filter.
Been driving my 67, looking forward to getting back in the ZR-1 for a change.

[ghlkal]

Originally Posted by randy ransome

Something I've never pondered.

Interesting discussion. Conventional wisdom is to have the oil warm/hot to suspend the gunk. But, I wonder if that is really necessary.

[Dynomite]

Originally Posted by ghlkal

Interesting discussion. Conventional wisdom is to have the oil warm/hot to suspend the gunk. But, I wonder if that is really necessary.

I would think any suspended "gunk" would end up caught in oil filter 🙃

I have no clue how to remove an oil filter full of oil on the LT-5 😜

That is a BIG Advantage of the LT-5 over most any other engine (changing an empty oil filter with no mess) having a vertical and upside down oil filter 👍👍

As long as you give the oil filter time to drain back 👍

Regarding Oil Filter Drain Back issues.........and.....

For those of us who fire up the LT-5s (and assume sufficient crank shaft and rod lubrication exists) no matter if they have been stored/sitting for several months...........See Long Sit Before Starting

[tf95ZR1]

I don't want to hijack this thread, but it got me thinking:

I remembered hearing that our oil filters have an
"anti-drain back feature." Verified by:

http://www.zr1specialist.com/HAT%20W...comparison.htm
Yes, this is older (1997/2005) but ...

Q1) Do all our ZR-1 oil filters have this feature? Are all oil filters anti-drain
back? Or just upside down/vertical?

Q2) Anybody add any oil into the filter before installing?
What a mess!

T

[rufcar]

The correct Blue filter has an anti drain back valve in it. You wont spill any. I always do all my cars cold. I know most use AMSOIL I used Brad Penn or now called Penn Grade. Hibeck told me its good stuff. I used Brad penn in some of my cars and Valvoline RV1 Racing oil in others all have the needed zinc but some Like Amsoil and Brad penn are semi synthetic whereas Valvoline is pure oil with zinc.

[bmarcum]

I also use the K&N oil filter because it has a pretty good anti drain valve. K&N oil filters are good. No comment on air filters. Anyone cut open one to see how much oil it is holding? Sounds like a fun project.

[tf95ZR1]

Trustworthy?

https://www.msn.com/en-us/autos/enth...3f6ec04c&ei=38