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Hi, I am new to the forum. I have a 1985.5na that had a similar problem. The oil pressure relief valve in my car was the 3 piece version, and it got stuck closed (oil pressure really high) and I blew out my oil filter. I lost 6 quarts of oil in mere seconds! Check around the seal of the filter and see if the gasket is blown out. If it is, you probably have the same problem I had.
I ended up pulling off the oil cooler housing (and the oprv with it) cleaned it all up, and put it all back together. When all was said and done, there were actually 4 parts to the oprv that come into play; the outer plug, a spring, a piston, and a sleeve that mounts firmly in the engine block. The sleeve is a guide for the piston. Mine had released from the engine block, and would sometimes interfere with the piston - hence the high oil pressure. When it blocked the piston - oil everywhere!!!
Mine runs fine now. Hope this helps.
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'86 944na - Dark Blue
'91 300e Mercedes Benz
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