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  4. M42 oil pressure switch choices?

M42 oil pressure switch choices?

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  • B
    B
    Boris3
    wrote on last edited by
    #1

    Any recommendations on an oil pressure switch for an M42 (1991 318is)? Choices at FCP Euro range from BMW at around $19 to FAE and Rein for around $5.  BMW tends to be the rule for a CPS. Not sure what the verdict is on an oil pressure switch.

    I noticed some oil pooling on the block in the nook under the oil pressure switch. I already replaced the oil filter housing gasket and o-ring a few years ago so suspect a leak at the pressure switch. Though it's also a little wet on the block under the forward intake runner and on the wire running down to the switch. Could be just oil blowing around or something more.

    1990 325i racecar (ITS, former Spec E30); 2004 330i ZHP

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    • B
      B
      B C
      wrote on last edited by
      #2

      I usually reach for FAE but I have never heard any bad reviews of any oil pressure switch brands.

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      • jc43089J
        jc43089J
        jc43089
        wrote on last edited by
        #3

        Anything should be fine besides Chinese junk.  As long as you pay attention that it lights up with key on engine off and it goes out when the engine starts it should be fine.  A friend recently trashed the engine in his Ford Focus because the light or sensor didn't work and he ran out of oil.  It got loud and started losing power but there weren't any warning lights so he drove to the next highway exit and that was too late.

        2/94 325i Sedan, Arctic Gray: UUC LTW FW, EVO 3 and DSSR, +.020 Maxsil pistons, ASC delete, Eibach shocks/springs, 16" contour reps 238k
        3/93 325i Coupe, Schwarz 2, Sketchy stance action, ebay turbo, 300k
        '89 325i Vert, Alpine White: 5spd swapped, sold.

        '04 Toyota Sienna: 24V to 24V swap in progress

        '05 Volvo V70R, 6spd.  200k
        '85 Toyota LandCruiser: Lifted, gas hog. 205k
        '99 Nissan Maxima: 5spd, Rusty but trusty winter beater. 252k RIP.

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