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MG Midget and Sprite Technical - Bosch oil filter/constant pressure?

I changed my oil today (20W50) and put on a new filter that I've not tired before, a Bosch 3330. My oil pressure never fluctuated despite the oil temp and the engine RPMS. I have used NAPA filters, WIX filters, K&N filters I used a K&N filter and it had too much pressure and blew oil out the dipstick) and several others. With all of those the pressure went from 40-65 dependent on the engine rpms. My Car is a 74 with an oil cooler.

My questions is are these: why is the pressure staying constant now and will I get start up pressure with this filter? Does this filter have a better back flow valve than the others? Will I get worse than the usual leaks with this filter?


Tom Nelson

This thread was discussed on 14/04/2014

MG Midget and Sprite Technical index

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