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  4. The "Random E30 Questions" Thread

The "Random E30 Questions" Thread

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  • B
    B
    B C
    wrote on last edited by
    #4

    Im assuming you are talking about the shear and heat characteristics which I agree with but the higher viscosity on the older design engines is used for maintaining proper film buildup between bearing surfaces when larger clearances are in play (old design engine)

    1 Reply Last reply
    0
    • jc43089J
      jc43089J
      jc43089
      wrote on last edited by
      #5

      Crank/rod bearing clearances are the same for m20 and m50 iirc.  .0008-.0023"

      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.

      1 Reply Last reply
      0
      • B
        B
        B C
        wrote on last edited by
        #6

        Same oil viscosity specs are called out for the M50 so that is probably correct.  (see uncopyrighted image b elow)

        E34OilSpecChartM50TU.jpg

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        0
        • straight6pwrS
          straight6pwrS
          straight6pwr
          wrote on last edited by
          #7

          SEM trim paint looks great and is high quality and matches the OEM trim look.  however, like most paint, your trim that has been on the car in the sun for 30 years won't really match anything perfectly if you are trying to touch it up.  repaint whole pieces for the best effect.

          Dan
          yajsYRL.jpg.e5f350b4dfe961d76ac8b32efce2e1a6.jpg

          1 Reply Last reply
          1
          • 6670charger6
            6670charger6
            6670charger
            wrote on last edited by
            #8

            I use 10W-40 in the winter and 20W-50 in the summer. Stock M20. Seems to do fine, although you can tell the difference in how the engine runs when that 20W-50 starts getting cold around early November. Will change sooner this year.

            88 325ic, Cirrus Blau; 120,000 miles

            66 Dodge Charger, red/black, mileage unknown

            Appleton, WI

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            0
            • DrLeadFootD
              DrLeadFootD
              DrLeadFoot
              wrote on last edited by
              #9

              On my old 2.7i m20 (eta motor with the i head) I ran 20w-50.

              Sent from my SCH-I535 using Tapatalk

              15924991875a64c599885m.jpg

                   @DrLeadFoot

              1 Reply Last reply
              0
              • B
                B
                Boris3
                wrote on last edited by
                #10

                Stock m20 in the Spec e30, run 20w-50 dino.

                For the rear diff make sure you can open the fill plug before you open the drain plug.

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

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                1
                • ClassEC
                  ClassEC
                  ClassE
                  wrote on last edited by
                  #11

                  straight6pwr said:

                  SEM trim paint looks great and is high quality and matches the OEM trim look. however, like most paint, your trim that has been on the car in the sun for 30 years won't really match anything perfectly if you are trying to touch it up. repaint whole pieces for the best effect.

                  Planning to do the whole lip, just want to be close in color/texture to bumper rub strips.

                  Is SEM a brand? Never heard if it - will try to find locally.

                  1 Reply Last reply
                  0
                  • EarlE
                    EarlE
                    Earl
                    wrote on last edited by
                    #12

                    It is a brand. It is one of the best trim paints. It is lacquer based so it is thin and will be the same texture as your lip is now. O'Reillys is a supplier for it but they may need to order you a can. I had them order it for me when I was working on my hatch trim.

                    museum sig 2earl.jpg

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                    1
                    • ClassEC
                      ClassEC
                      ClassE
                      wrote on last edited by
                      #13

                      Acouple more:

                      -I see people referencing "early" and "late" model taillights. Is the split on the taillight style the same as the bumper change from metal to plastic? Any overlap?

                      -Are the rear parcel shelves the same between the 2-doors and 4-doors?

                      -How do I reset the "oil change" interval LED thingy in the cluster?

                      1 Reply Last reply
                      0
                      • EarlE
                        EarlE
                        Earl
                        wrote on last edited by
                        #14

                        I believe the split follows the metal and plastic bumper change. The exception is that all e30 m3's use early tail lights=)

                        museum sig 2earl.jpg

                        1 Reply Last reply
                        0
                        • KaiserRollsK
                          KaiserRollsK
                          KaiserRolls
                          wrote on last edited by
                          #15

                          I would assume the parcel shelves should be similar between two and four doors.

                          Edit: just browsed realoem. Looks like the 2dr and 4dr window shelves have the same part numbers

                          And I think you need a tool to reset the SIL in the dash

                          -or jump some pins

                          http://www.beckerelectronics.com/BMW/servicelightreset.html

                          Just don't jump the wrong pins.

                          Fwiw, mine are on, I try not to look at them

                          1 Reply Last reply
                          0
                          • ClassEC
                            ClassEC
                            ClassE
                            wrote on last edited by
                            #16

                            Lesson learned from doing inner tie rods: they utilize a "lock plate" to secure the inner tie rod to the rack.... Order new ones before starting project.

                            1 Reply Last reply
                            0
                            • TehRaydarloverT
                              TehRaydarloverT
                              TehRaydarlover
                              wrote on last edited by
                              #17

                              Do people typically not over bore their m20 when rebuilding it for boost? Is it safe to do an overbore for boost?

                              Untitled1zps3446a42f.png

                              1 Reply Last reply
                              0
                              • jc43089J
                                jc43089J
                                jc43089
                                wrote on last edited by
                                #18

                                No need to bore it unless cylinders are out of spec, I tore one down with 280+k (broken odo) and it was still in spec.

                                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.

                                1 Reply Last reply
                                0
                                • m42b32M
                                  m42b32M
                                  m42b32
                                  wrote on last edited by
                                  #19

                                  Well, this is probably the place to ask this (oil questions again):

                                  I need to change my oil again (e30 318is, 1000 miles of driving will be occurring in the next 10 days) and I don't know what oil I should use because there is no concrete answer for m42 cars. I don't want to go to a full synthetic because I don't want any more leaks to develop. I currently have castrol gtx high mileage 10w-40 and it was pretty good in the colder weather but I have been noticing a lot more audible ticking at lower RPM's (possibly due to the oil being too thin?) recently as the temperatures have been steadily 65+. Would changing to 20w-50 (probably castrol gtx high mileage again) be a good choice for the summer or would it put too much strain on the pump/not flow well on startup/etc in WI summer temperatures? This weight seems to be the consensus on m20's but for the m42 I can't find a consistent answer.

                                  Sent from my DROID RAZR HD using Tapatalk

                                  1991 318is, 1991 318i, 2022 Bronco

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                                  • EarlE
                                    EarlE
                                    Earl
                                    wrote on last edited by
                                    #20

                                    20w-50 or 15w-50 would be great=-)

                                    museum sig 2earl.jpg

                                    1 Reply Last reply
                                    0
                                    • jc43089J
                                      jc43089J
                                      jc43089
                                      wrote on last edited by
                                      #21

                                      BMW engines all tick like a sewing machine, I would not be concerned about that.  I would also use synthetic but that's my personal preference.  I just filled my new to me m20 with 150k on it with royal purple 10w-40.

                                      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.

                                      1 Reply Last reply
                                      0
                                      • mkoeppM
                                        mkoeppM
                                        mkoepp
                                        wrote on last edited by
                                        #22

                                        I found this on MyE28.com on how to reset your service interval lights. I am sure it is the same for the E30. 

                                        http://www.mye28.com/viewtopic.php?t=35609

                                        My best suggestion for anyone working on old BMW's is to get a Bentley Service Manual for their MY car and read the whole thing. Tons of info and tips. 

                                        One cool thing I have found out and used is that you can activate the starter with the diagnostic port. Very useful when adjusting valves.

                                        1 Reply Last reply
                                        0
                                        • m42b32M
                                          m42b32M
                                          m42b32
                                          wrote on last edited by
                                          #23

                                          Earl said:

                                          20w-50 or 15w-50 would be great=-)

                                          That's what I was thinking, I would really like 15w-50 but I can only get that as a full synthetic, so I am really leaning towards the 20w-50.

                                          jc43089 said:

                                          BMW engines all tick like a sewing machine, I would not be concerned about that.  I would also use synthetic but that's my personal preference.  I just filled my new to me m20 with 150k on it with royal purple 10w-40.

                                          Its the worst haha, the reason I am putting so much thought into it is that my engine just seems to be louder than my old m42 so I want to see if I can quiet it down. In my old car I switched to mobile 1 full synthetic and I had an oil pan gasket leak pretty soon after so I am wary of accelerating any leaks I already have, has anyone else had that problem?

                                          mkoepp said:

                                          I found this on MyE28.com on how to reset your service interval lights. I am sure it is the same for the E30.  http://www.mye28.com/viewtopic.php?t=35609 My best suggestion for anyone working on old BMW's is to get a Bentley Service Manual for their MY car and read the whole thing. Tons of info and tips.  One cool thing I have found out and used is that you can activate the starter with the diagnostic port. Very useful when adjusting valves.

                                          It looks like a similar process, I've always done the paperclip technique to reset it haha. The e30 Bentley doesn't cover the m42 so I haven't bought it yet, but I do have the e36 Bentley which does. The e36 Bentley recommends 15w-40 for the summer so maybe I will just stay with what I have. I guess ultimately it doesn't make a ton of difference as long as I'm not going WAY far away from the original spec Sent from my DROID RAZR HD using Tapatalk

                                          1991 318is, 1991 318i, 2022 Bronco

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