ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

[Rich C.]

I don't have one, but intrigued just the same. How does one change the inverted oil filter on the C-4 ZR-1's? Thanks!!!

'73 LS-4 454 owned 21 3/4 years

Smu ttynose IPA, now on tap!

[John H.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

I don't have one, but intrigued just the same. How does one change the inverted oil filter on the C-4 ZR-1's? Thanks!!!

'73 LS-4 454 owned 21 3/4 years

Smu ttynose IPA, now on tap!

Rich -

I'm not a ZR-1 guy, but I'm sure they use a filter with a built-in check valve; Ferrari has used inverted filters with built-in check valves for over 45 years, and they don't dribble a drop when you remove them.


Filters.jpg

[Clem Z.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

you also have to use that type oil filters or you will hear a "rattle" from a dry start because the filter will be empty. i ran into this even with cars with horizontal oil filters like the old "iron duke" as you had to make sure the filter had a anti drain back valve. i believe that was the diffwerence between the PF-51 and the PF-52 the valve

[Joe L.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

you also have to use that type oil filters or you will hear a "rattle" from a dry start because the filter will be empty. i ran into this even with cars with horizontal oil filters like the old "iron duke" as you had to make sure the filter had a anti drain back valve. i believe that was the diffwerence between the PF-51 and the PF-52 the valve

clem-------


Yes, the anti drain-back valve was the difference between the PF-51 and PF-52.

By the way, the old "Iron Duke" had to be one of the most miserable engines GM ever built. I experienced several of them in rental cars of the day. I once had about an 86 Camaro with the Iron Duke. That car was so gutless it should have been illegal.

[Rich C.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

Rich -

I'm not a ZR-1 guy, but I'm sure they use a filter with a built-in check valve; Ferrari has used inverted filters with built-in check valves for over 45 years, and they don't dribble a drop when you remove them.


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Verrrry interesssstttting, glad I asked. Every day I learn something new, is a good day! Thanks!

'73 LS-4 454, owned 21 3/4 years

Smu ttynose IPA, now on tap!

[Clem Z.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

clem-------


Yes, the anti drain-back valve was the difference between the PF-51 and PF-52.

By the way, the old "Iron Duke" had to be one of the most miserable engines GM ever built. I experienced several of them in rental cars of the day. I once had about an 86 Camaro with the Iron Duke. That car was so gutless it should have been illegal.

i had a new 80 citation coupe 4 speed when they came out. i could get 45 MPG out of it on the interstates drafting moving vans as they would suck me along in the draft. i would always tell the truck driver on my CB radio i was back there. . i had a fuel meter on it just to see what it would do MPG wise. i built several into 4 cylinder race engines using a mercury marine cylinder head and a small 4 barrel.

[Richard M.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

I own a 92' ZR-1, truthfully it is the easyist car to change oil in that I have ever owned.

Joe, the Iron Duke runs like a sewing machine compared to the old Vega 2300 now that was
a real POS.

[Joe L.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

I own a 92' ZR-1, truthfully it is the easyist car to change oil in that I have ever owned.

Joe, the Iron Duke runs like a sewing machine compared to the old Vega 2300 now that was
a real POS.

Richard------


Yes, I once had a 1975 Vega station wagon as a work car. The engine sounded like a thrashing machine.

GM just never has had any real success with 4 cylinder engines. I can't think of a single one that was competitive with a Honda or Toyota. I had high hopes for the Ecotec but after driving quite a few of them in rental cars I am greatly disappointed.

[Duke W.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

I have two vehicles with "upside down" filters. One uses a filter with an internal check valve, the other doesn't. With both I first check to verify that the filter will loosen using the appropriate filter socket - about 1/4 turn. Then I puncture the highest point of the filter housing with a center punch.

Now I go on to remove the pan drain plug and after about 15 minutes I remove the filter, and they are both empty with nary a drip, but it helps to spin it off quickly and cover the bottom with a rag as you remove it.

Duke

[Clem Z.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

I have two vehicles with "upside down" filters. One uses a filter with an internal check valve, the other doesn't. With both I first check to verify that the filter will loosen using the appropriate filter socket - about 1/4 turn. Then I puncture the highest point of the filter housing with a center punch.

Now I go on to remove the pan drain plug and after about 15 minutes I remove the filter, and they are both empty with nary a drip, but it helps to spin it off quickly and cover the bottom with a rag as you remove it.

Duke

i do the same thing even with a SBC filter and drain the filer into a pan before trying to remove it so i don't have a messy filter when i remove it. even with the hole you need to crack the filer loose to let in some air to get it to completely empty

[Tom H.]

Re: ZR-1 (90-95) Oil Filter Changing? Messy as it looks?

Agreed. No mess to change oil in the LT5. Thanks to the check valve.