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There were two upgrades for road models during the life of the 24x motor. In 1976 the pan was deepened, and in 1981 the pan was deepened slightly more and redesigned to include a baffle plate.
The enduro models retained the shallow oil pan (with threaded bosses for a bash plate), although this was deepened slightly in 1991.
Note: Enduro models for this purpose include not only the G/S and GS, but also the Roadster and Mystik since they had the same configuration.
These are the original combinations which work together properly.
11 13 1 337 330 shallow oil pan (without threaded holes was
11 13 1 251 295, now obsolete)
11 43 1 337 543 "B" dipstick (metal handle was
11 43 1 252 661, now obsolete)
11 41 1 252 223 pickup head
11 31 1 262 723 deeper pan
11 43 1 337 542 longer "A" dipstick (metal handle was different PN, now obsolete)
11 41 1 262 971 extension for use with 223 head, for /6.
12mm phenolic. Functionally obsolete.
11 41 1 265 590 extension for use with 223 head, for /7. 10mm aluminum.
11 13 1 336 995 deepest oil pan, with baffle
("A" dipstick as previous)
11 41 1 337 536 cast aluminum pickup head
These used a 1/2" deeper pan with the drain hole in the rear wall, possibly to work better with the PD bash plate. The dipstick has the same length and MIN marking as the earlier GS one, but the MAX mark is lower. A baffle was added inside the pickup head.
11 13 1 338 620 oil pan
11 43 1 338 635 "C" dipstick
11 41 1 338 634 baffle inside 223 pickup head
Early pans were shallow with no baffle. These used a simple metal pickup head.
In 1976 they were deepened, and a 10mm spacer was used to lower the pickup head. Dipsticks were lengthened correspondingly.
In 1981 they got slightly deeper still, with a baffle at the front to keep oil close to the pickup head during moments of brief deceleration. This design used an all-new one-piece cast aluminum pickup. Same dipstick as before, but now with a plastic handle.
The G/S and GS (along with the R and Mystic) always had shallow oil pans. 80-90 models were dimensionally identical to the /5 (except they had threaded holes to mount a bash plate), while '91-'95 models had a 1/2" deeper, smooth-bottom pan with a lower MAX mark on the dipstick. The early shallow pan with the threaded holes is now the replacement for the /5.
| Part number | External depth | Notes |
|
|---|---|---|---|
| Front | Rear | ||
| 11 13 1 251 295 | '70-'75, R65 through '80 (obsolete) |
||
| 11 13 1 337 330 | 40mm | 19mm | Enduro through '90, holes for bash plate |
| 11 31 1 262 723 | 55mm | 29mm | '76-'80 |
| 11 13 1 336 995 | 66mm | 48mm | '81-'95 (not enduro), rearward-facing drain. |
| 11 13 1 338 620 | 52mm | 32mm | '91 and later enduro, rearward-facing drain, smooth bottom. |
|
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Dipsticks had plastic handles after 1980, with the letters A, B, or C molded in. The equivalent plastic-handle version is the official replacement for earlier metal ones.
From the top:
| Part number | Max | Min | OA | Notes |
|---|---|---|---|---|
| 11 43 1 252 661 | 247 | 274 | 277 | Metal handle, from /5. Superseded by "B". |
| -- -- - --- --- | 260 | 282 | 287 | Metal handle, from /7. Superseded by "A". |
| 11 43 1 337 542 | 263 | 284 | 288 | "A" plastic handle, from '84 R65. |
| 11 43 1 337 543 | 247 | 273 | 277 | "B" plastic handle, from '88 GS. |
| 11 43 1 338 635 | 256 | 274 | 278 | "C" plastic handle, from '91 GS. Like B, but MAX is lower. |
There are only two types, the steel type and the cast type. The steel type was extended with the 10mm spacer before the cast version was introduced, but the offroad versions always used the steel one. The cast one extends deeper than the steel one with the spacer.
The original spacer was 12mm, made of phenolic resin. This can compresss with age, causing the bolts to loosen. The 10mm metal spacer is an update.
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11 41 1 337 509 pickup strainer plate
11 41 1 252 226 wire retainer
11 13 1 338 427 oil pan gasket
11 41 1 265 258 oil pickup gasket (use two with 590 spacer)
The deep pan and cast pickup are better than the earlier designs, so you can get more reliable oil delivery using the newest parts. If you're looking to upgrade your pre-1981 street bike, or your R100R or Mystik, use the parts that were on the 1995 RS and RT. If you're looking to upgrade your GS, buy the parts that were on the 1995 GS (provided you want to stay with the shallow sump).
The aftermarket provided several deeper oil pans, especially during the '70s before BMW had a good deep pan of their own.
Most popular is probably the Luftmeister 3-hole sump extension.
Still made, by MAC which is better known for exhaust systems, is this pan (left).
HPN makes this custom sump extension which uses a bottom plate rather than a separate pan (right). It's very strong and is the basis for every rally bike engine. Motoren-Israel sells a similar one.
Motoren-Israel makes a custom sump extension which replaces the oil filter canister with a fitting for an external spin-on filter. It's available in standard (shown here) and lightweight, which has machined pockets in the sides. They also sell a deep sump.
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