Originally Posted By: Asterix
I've done this for a long time with my '88 Toyota Supra and will continue to do so. However, I can just reach in from above and easily swap out the filter. If the car has sat overnight, there's no spillage. Then I top it off with about 1 quart. It gets a new filter every 2500 miles. I only drain the pan every 10,000 miles.
There is definitely an increase in pressure after changing the filter, which tells me the filter is restricting the flow.
I'd do this with my Nissan 350Z, but I can't get to the filter without jacking up the car and pulling off the undercover, and by that time I may as well change everything.
Besides, the VQ seems to be far cleaner than the old 7MGE. The EGR on the 7MGE surely doesn't help the oil cleanliness.
Asterix
One time this girl I knew was considering having her engine rebuilt because the oil pressure was slowly dropping, and wouldn't return to a normal pressure.
I asked her to allow me to install an Amsoil filter, and see what happens. So I went out and swapped out filters with an Amsoil filter, and topped off the crankcase with whatever bargain-bulk she picked up from Walmart.
She came back to work the next day and told me the oil pressure had returned to it's normal state, and then some. She said she had recently had the oil changed, apparently the filter installed was absolute garbage.
The next week she traded the truck in for a Jeep Cherokee.
I'm glad I was able to save her two thousand dollars for a rebuild, and to help her get rid of the vehicle easily.