A bit light on the Sultan there Brad,
Here's a list (1997 ish) of the BMW's the Sultan of Brunei had, over 50 E31's he is now reported to have well over 5,000 different cars.
Make Model Reg Chassis
BMW 750iL BP9889 WBAGK22090DH61233
BMW 535i BL9678 WAPBA35012BB20571
BMW 328i KF8282 WBBK82020ET80957
BMW 530i BQ7037 WBAHK220X0GF75090
BMW 750i BQ3515 WBAGC820004372784
BMW 750i BQ3509 WBAGC820204372625
BMW 735iL BK145 WBAGC820104372728
BMW 750iL BQ3516 WBAGC82030DC71208
BMW 750i BQ3513 WBAGB82070DB54332
BMW 735i BQ3518 WBAGB620801660531
BMW B10 BK8800 WBAH22060BF53160
BMW 535i BK7780 WBAH022050BF52503
BMW 535iA KF9299 WBAHD22090BF53265
BMW 750iL BQ3366 WBAGC820104372261
BMW 750i BQ7188 WBAG82030DB54313
BMW 535iA BQ7129 WBAHD22020BF53267
BMW 530i BQ7531 WBAAKZZ050GF75093
BMW 530i BN1889 WBAHKZZ060GF75040
BMW 530i BN2819 WBAHK22060GF75023
BMW 535i BK9385 WBAHD220X0BF52643
BMW Z1 BN2121 WBABA91070AL03888
BMW 530i BN8105 WBAHKZZ060GF75037
BMW Z1 DPD WBABA910X0AL01455
BMW M535i BH9597 WBADC82OX00660712
BMW Z1 BK5511 WBABA91060AL01467
BMW Z1 DPD WBABA91060AL01842
BMW Z1 DPD WBABA91000AL03649
BMW 535i BK7199 WBAHD22090BF53198
BMW 535i BH1377 WBAHD220504139188
BMW B10 BK8571 WAPBA35011BB20518
BMW 535i BJ9535 WBAHD220X04139753
BMW 535i BJ9900 WBAHD220904139856
BMW 535i KE7557 WBAHD22040BF52511
BMW 750iL BJ7484 WBAGC82020DC71037
BMW 750i BP2011 WBAGC820504372781
BMW 750i BQ3501 WBAGB8200DB54267
BMW 850i NONE WBACG22B70CB57078
BMW 530i BP1299 WBAHK22000GF75034
BMW 530i BQ7038 WBAHK22030GF75089
BMW 530i BN8778 WBAHK220X0GF75087
BMW 530i BM9992 WBAHK22060GF75068
BMW 530i BM9992 WBAHK22000GF75079
BMW 530i BQ8787 WBAHK220400GF75084
BMW 535i KF8579 WAPBA35011BB20515
BMW 850i BMW850 WBAEG22040CB57197
BMW 750iL BQ3511 WBAGB820X0DB54230
BMW 750iL BQ3504 WBAGC820904372136
BMW 750iA KF9333 WBAGB82080DB54128
BMW 735iL BQ3503 WBAGC820X0DC71125
BMW 750iL BQ3517 WBAGC82090DC71195
BMW 850i KE8508 WBAEG22090CB57275
BMW 750i BQ3514 WBAG082020DB54352
BMW 735i BQ3512 WBAGB620201660928
BMW 750iL BP2013 WBAGC82050DC71310
BMW 735i BP2015 WBAGC820804372841
BMW 735i BQ3510 WBAGC820004372882
BMW 850i BL9125 WBAEAG220800CB577
BMW 535i BN5995 WBAHD220X0BF52903
BMW 325i KF9388 WBABB22010EC15224
BMW M3 BK7105 WBSBB05090EB86177
BMW 750iL BQ8888 WBAGC820404372707
BMW 735i KD1745 WBAFH820007872035
BMW 535i BH5351 WBADC810700655159
BMW 535i KE9398 WBAHD22000BF53199
BMW 750iL BQ7000 WBAGC8204DC71170
BMW 750i KF9919 WBAGB82090DB54123
BMW 735i BG7920 WBAFH4207C7426817
BMW 750i NONE WBAGC82030DC71340
BMW 325i KF9989 WBABJ62080EC76063
BMW M3 BN379 WBSBJ92080ES85355
BMW 850i BL8898 WAPBC50C02D110063
BMW 850i BL3000 WBAEG22010CB57612
BMW 850i KE8505 WBAEG22010CB57075
BMW 540i BQ1661 WBADE62040BW70106
BMW 750iAL BQ3502 WBAGC82090DC71357
BMW 850i BN2829 WBAEG22000CB57441
BMW 535i BK7755 WBAHD22090BF53590
BMW 535i BJ8888 WBAH220004575320
BMW 535i BK9119 WBAHD22010BF52904
BMW 535i KE9527 WBAHD22050BF52758
BMW 535i KE8383 WBSHD92070GA25263
BMW 850i BN2139 WBAEG22030CB57787
BMW 750iL BP9898 WBAGK22000DH61234
BMW 850i BM7557 WBAEG22050CB57032
BMW 750i BK7510 WBAGB82050B541211
BMW NAZCA BL8999 003/ID
BMW 850CSi KF6783 WBSEG92000CC88048
BMW 850i BN2188 WBAEG22020CB57683
BMW 535i BM501 WBAHD22024139892
BMW 850i BN2899 WBAEG22040CB57426
BMW 850i BN1969 WBAEG22030CB57336
BMW 850i BN1979 WBAEG22060CB57220
BMW 850i BN2889 WBAEG22000CB57732
BMW 850i BQ1010 WBAEG22070CB57212
BMW 850i BN2199 WBAEG22020CB57473
BMW 850i BN1980 WBAEG22010CB57772
BMW 850i BN1938 WBAEG22080CB57428
BMW 850i BN2289 WBAEG22040CB57474
BMW 850i BN2818 WBAEG220X0CB27396
BMW 850Ci BN2198 WBAEG22000CB57908
BMW 850i BQ2838 WBAEG22080CB57185
BMW 850i BN2218 WBAEG22030CB57742
BMW 850i BN2918 WBAEG22030CB57773
BMW 850i BN2238 WBAEG22090CB57390
BMW 850i BN2219 WBAEG22050CB57743
BMW 850i BN2298 WBAEG22090CB57521
BMW 850i BN1978 WBAEG22060CB57394
BMW 850i BN2293 WBAEG22010CB57383
BMW 850Ci BN2778 WBAEG22050CB57919
BMW 850i BN2189 WBAEG22030CB57269
BMW 850i BN1929 WBAEG22000CB57357
BMW 850i BN1822 WBAEG220X0CB57575
BMW 850i BN9996 WBAEG22000CB57729
BMW 850i BN1939 WBAEG22010CB57268
BMW 850i BN2919 WBAEG2208OCB57686
BMW 850i BN2318 WBAEG22090CB57440
BMW 850i BP1879 WBAEG22000CB57083
BMW 850i BN2898 WBAEG22000CB57133
BMW 850i KE8790 WBAEG22060CB57606
BMW 750iL BJ9579 WBAGL8204372337
BMW 750iL BJ9229 WBAGC820X0DC71092
BMW 735iL KD3051 WBAGC620X02725273
BMW 750iL KE5753 WBAGC820204372141
BMW 750iL KE5735 WBAGC820X04372128
BMW 850i KE8502 WBAEG22090CB57079
BMW 325i BM9995 WBAGC62090EC76105
BMW 325i KF1128 WBABJ620EC76420
BMW M3 BN378 WBSBJ62000ES83270
BMW 525i BN6886 WBAHD62080BJ37678
BMW 850i KE8503 WBAEG22050CB57080
BMW 850i BK2 WBAEC22020CB57098
BMW 525i BL9820 WBAHJ62090GD10H00
BMW 850Ci BL9088 WAPBC50C02D110064
BMW 850CSi KF6782 WBSE692070CCAA046
BMW 850Ci BN1988 WBAEG22050CB57967
BMW 750iL BK9282 WBAGC82050DC71176
BMW 530i BN8107 WBAHK22010GF75088
BMW 530i BN8106 WBAHK22040GF75036
BMW 850i BL2680 WBAEG22010CB57402
BMW 735i BQ3505 WBAGB42040DB31101
BMW 750iAL BQ3508 WBAGC820104372504
BMW 750iAL BQ3355 WBAGC820204372818
BMW 735iL BQ3506 WBAGC82020DC71068
BMW 735i BE7351 WBAGB82030DB54120
BMW 750iL BQ3530 WBAGC820504372232
BMW 750iL BQ3507 WBAGC82050DC71128
BMW 325i BM9656 WBABF42060JA89854
BMW 530i BN6262 WBAHK22030GF75092
BMW 530i BM9922 WBAHK220X0GF75039
BMW 850i KF2032 WBAEG922090CB57776
BMW M1 DPD WBS59910004301120
BMW 530i BN1889 WBAHKZZ090GF75095
BMW 1100LT KE9929 6459817K1100LT
BMW 320i BM8902 WBACB22060FA05331
BMW M3 BN1110 WBSBF92080EA66626
BMW 328i BP9332 WBACD22070AS64592
BMW 328i BP8281 WBACD22080A564634
BMW 328i BP8629 WBACD220X0A564733
BMW 735iL BP2014 WBAGC82000DC71067
BMW 750iL BP2010 WBAGC820604372725
BMW 750iL BQ767 WBAGC82020DC71359
BMW 750iL BQ747 WBAGC82090DC71178
BMW 735iL BQ727 WBAGC820404372416
BMW 540i L51HUW WBAHK42090GB64016
BMW 525i P990RUL WBAHJ62060GD13416
BMW 540i 1TOY WBADE62090BW71025
BMW 750i N922OYM WBAGG22020DG70032
BMW 325i PGN1 WBAB822090EC15357
BMW 850i H1PNR WBAEC22040CB57121
BMW 328i N809GLH WBACD22090AS61838
BMW B10 KE8579 WBAHD22020BF54368
BMW E39 ALPINA BQ8890 WBADE62050BW72060
BMW 750iL KF9922 WBAGC82000DC71151
BMW 540i BH724 WBAHE62030GF20334
BMW 735iL KA724 WBAGC42020DC16872
BMW 850i BL3003 WBAEG22000CB57214
BMW 530i BL26 BAHK22070GF75094
BMW 850i BH8 WBAEG22030CB57319
BMW 750i BM8724 WBAGB82050DB54457
BMW 750i BM12 WBAGB82060DB54175
BMW 320i BM8903 WBACB22020FA06198
BMW 318IS BR9321 WBABE82070EU21896
BMW B12 ALPINA BQ1881 WAPBC57L08RD30122
BMW 530i BM88 BAHK22040GF75070
BMW 850i BL2768 WBAEG22040CB57376
Like a lot of people I would love an 850 csi or better still an Alpina B12 E31.... Never mind I will just have to stick to my 840 ci Sport Individual 4.4l.