Dipstick

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The Oil Level Gauge, commonly called a Dipstick, differs between early and late A12 engines.

Overview

Short: ~9-1/16 inches from tip to bottom of rubber
Long: ~14-3/4 inches from tip to bottom of rubber

If you rotate the A12 dipstick 180 degrees and put it back in, it hits the crank. Makes a crazy slapping, tapping, whacking noise.

Early type goes directly into block (1970-1973) so uses a short stick

H10 version is used by front-distributor A12 engine.

Late type goes into a tube which is inserted into block (late 1973-up)

H50/H72/H95-type gauge is also used by B210 and B310 A12/A14/A15/A12A engines.

Dipstick only goes in one way. Position it in so that the flat of the stick is parallel with the block so that it slides into the tube bend.

Oil Capacity

with oil filter change 3.2 Litres (2-7/8 qt)
w/o oil filter change 2.7 Litres (2-3/8 qt)

The exact amount depends on which oil filter you use. Filters range from more than 1 litre to less than 1/2 litre.

When changing oil and filter, add 3 liters, then check the dipstick to see how much more is needed. From the L line to the H line is 1 liter.

Part Numbers

Tube

15146 ASSY-GUID,OIL LEVEL GAUGE [Dipstick tube]
see part numbers below

1200

B110 USA + JPN
11140-H1002 GAUGE-OIL LEVEL A12
11140-H1003 GAUGE-OIL LEVEL A12 <> 11140-H1002 
* USA: 0271-

B120 JPN
11140-H5001 GAUGE-OIL LEVEL -8808 NOK <> 11140-H5002
11140-H5002 GAUGE-OIL LEVEL 8808-8910 オオイセイサク
11140-H5010 GAUGE-OIL LEVEL 8808-8910 NOK
11140-G5101 GAUGE-OIL LEVEL 8910-
15146-H5001 GUIDE-OIL LEVEL GAUGE -8109 <> 15146-H5002
15146-H5002 GUIDE-OIL LEVEL GAUGE 8110-8910
15146-G2600 GUIDE-OIL LEVEL GAUGE 8910-8912
15146-G2501 GUIDE-OIL LEVEL GAUGE 8912-

RWD

B10 JPN
15140-18001 GAUGE-oil level
11140-18002 GAUGE-oil level <> 15140-18001

B210 USA + JPN
11140-H5001 GAUGE-OIL LEVEL 
* USA -0275
* dipstick L-H lines 1.3 liter
11140-H7200 GAUGE-OIL LEVEL 0375- USA 4/5 11140-H5001
* dipstick L-H lines 1.0 liter. See A-series_Engine_Changes#1976
15146-H5001 GUIDE-OIL LEVEL GAUGE

B310 JPN
11140-H5001 GAUGE-OIL LEVEL [all engines, all years]
11140-H5010 GAUGE-OIL LEVEL -8010 [2nd source]
15146-H5001 GUIDE-OIL LEVEL GAUGE [all years]
15146-H5002 GUIDE-OIL LEVEL GAUGE 7910-

B310 USA
11140-H5001 GAUGE ASSY-OIL LEVEL (NOK) A12A
11140-H5010 GAUGE ASSY-OIL LEVEL (OOI) A12A
11140-H9500 GAUGE ASSY-OIL LEVEL (NOK) A12A <> 11140-H5001
15146-H5001 GUIDE ASSY-OIL LEVEL GAUGE
15146-H5002 GUIDE ASSY-OIL LEVEL GAUGE -0780 <> 15146-H5001
15146-H9801 GUIDE ASSY-OIL LEVEL GAUGE 0880- <> 15146-H5002

FWD

FWD A-series engines use a totally different dipstick.

F10 USA
11140-M3001 ASSY-GAUGE,OIL LEVEL -1076
11140-M4965 ASSY-GAUGE,OIL LEVEL 1076- Y 11140-M3001
11145-M3001 ASSY-GUIDE,OIL LEVEL -1076
11145-M4966 ASSY-GUIDE,OIL LEVEL 1076- Y 11145-M3001
11146-M3000 ASSY-SUPPORT,OIL LEV

N10 USA
11140-W6660 GAUGE-OIL LEVEL A15S
11140-W7000 GAUGE-OIL LEVEL A14S
11140-W7001 GAUGE-OIL LEVEL A14S <> 11140-W7000
15146-W7001 GUIDE-OIL LEVEL GAUGE A14S
15146-W6660 GUIDE-OIL LEVEL GAUGE A15S
15146-W6661 GUIDE-OIL LEVEL GAUGE A15S

Oil Level

Oil should be between H and L marks.

Marks are the same for early (H10) vs late (H50) gauges, even though the overal gauge length differs. That's because they use the same oil pan! The oil level from the bottom of the pan is what is important.

Tube Removal

Use vice-grips and tap it up and out while twisting back and forth.