I've been using UPF44 oil filters on my Z06 for years. The last few filters, the base is rusty out of the box. What filter do you use ?

 

Currently, Purolator PureOne PL14006 ... and no, it's not restrictive.

Have used WIX, NAPA Gold, Amsoil in the past. The Fram Ultra (full synthetic) looks nice. All are good filters and endorsed by BITOG guys.

 

Used to be Wix and NAPA Gold, but I've recently gone full snob and run Mobil 1 or K&N filters. The former are good, the latter better.

 

K&n is the only filter I use in the z, Its a very well built filter and that 1" nut is well worth a few bucks more imo. It's so nice to never have to mess around with trying to remove a stuck filter. Use them in our two other dd's too since I use the M1 15k mile oil in them. Change them between 12-15k so I want the best filter if its going to be on that long.

 

I have always used and will continue to use the UPF-44 filters. Never had a rust problem on mine and order then by the 6 pack case. I would question where and how the filters you are getting have been stored. Those filters came in contact with a lot of moisture somewhere.

 

I use WIX on all my cars. I stay with standard filters since the ones with finer filtration also are more restrictive and cause more pressure drop.

 

Not true ... and I'm willing to bet that the PureOne is probably freer flowing than most filters on the shelves. With a positive displacement oil pump, the pump would have to be in pressure relief mode before you'd ever see an oil pressure difference due to the oil filter being used. Only way to get to pressure relief is to run at redline all the time.

I've used 4 or 5 different brand oil filters on my Z06 and they all give me the same oil pressure at the same oil temperature and engine RPM when using Mobil 1 5W-30.

Check this out.

http://www.bobistheoilguy.com/forums...51#Post1619451

http://www.bobistheoilguy.com/forums...74#Post3155974

 

Not true, you should hit max pressure about halfway through the rev range.

 

I always use NAPA Gold, they are Wix racing filters made for Napa. I used a K&N once. It had scrape marks on the nut. My car is lowered so never again on that filter. It actually was lower than my headers.

 

The post you are referring to is done at 212F oil temps. Oil temps run much higher.

 

K&N on my Z06. AC Delco on my pick up. NAPA Gold on my BMW.

 

Not with 5W-30 at 200 F or higher, and stock oil pump. My '02 Zee won't hit pump pressure relief until about 5000 ~ 5500 RPM, which isn't far from red line.

If you're seeing pump relief at 3000 RPM, then you're running thicker oil and/or have a high volume output pump (ie, not stock).

 

If your oil temp is "much higher" than 212 F, then you're probably on a race track with lots of WOT use. Every day street driving should give you oil temps around 200 ~ 215 F.

 

Stock engine, 0W40. I'll double check on the wayhome again.

 

0w-40 is definitely thicker at 200+ F than 5w-30, so that's why you see pump relief pressure at lower RPM.

Forgot to say, a more "restrictive" oil filter will however cause the oil pump to go into pressure relief mode sooner. So if you are seeing max oil pressure at 3000 RPM, it could be a combo of the thicker oil and a more restrictive oil filter. You wouldn't know for sure unless you ran many filters with the same weight oil at the same temperature to give the same baseline viscosity parameter.

Like I said earlier, I've used 4 different brand filters with Mobil 1 5W-30 and I can't tell any oil pressure different at idle, or at many RPM points all the way up to near red line (oil pressure taken at the same oil temp) when the pump goes into pressure relief mode.