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[Datsun 1200 encyclopedia]

Oil cap

From Datsun 1200 Club

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Category: Engine Lubrication System

The stock Datsun 1200 Rocker cover uses a push-and-twist oil cap. It is a classic all-chrome cap and seals with a simple round gasket. Some other Datsuns use a threaded cap that will not work in a 1200. By the way, this is where you add oil to the engine.



All A-series engine rocker covers uses a cam-twist (push-and-turn) oil filler cap.

Datsun 1000 vented cap
Datsun 1200 sealed cap
  • All A-series engines from 1970-on use a sealed cap including all A12/A13/A14 and A15
  • Other Datsun engine types use a threaded cap that will not work in a 1200
  • Alloy rocker covers invariably use a different type of oil cap

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The original 1200 cap Part Number is Nissan 15255-15953. However if you order this part number you are likely to get one of the superseded styles instead of the plain silver version.

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The timeless style of the original B110 cap looks good with customized engines
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1200 from intro to 1978 March (Japan) or to circa 1973 (USA)
* superseded by #B34 'NISSAN MOTOR OIL' cap
15255-15953 CAP-OIL FILLER
2-3/4" Oil Filler Cap (1-13/32" x 1-19/64" Cam Twist)
* STANT Part # 10102
* GATES Part # 31088 
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* NOT BECK/ARNLEY Part # 0160048 screw-in cap (fits L-series)

Aluminum Version

Machined aluminum version of original 1200 style oil cap

VENDOR: Bprojects Product: Billet Hollow Oil Filler Cap RAW☁
Aluminum A6063
Hollow structure, very lightweight 100g

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May be finished with Elephant applique from Bprojects
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Or a Nissan applique
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Color varieties from Bprojects
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Datsun 1000

The earliest A-series engine, the B10 Datsun 1000 A10 engine, uses a vented oil cap, so it doesn't work with the 1200 (Datsun 1200 caps are sealed). Vented cap is also known as a "blowby cap" because fumes will come out of it -- visibly so when the engine is worn. 1200 uses a sealed cap for happy motoring.
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* R16 engine (Datsun Roadster)
* J13 engine (Bluebird 411, Datsun Trucks 521, 620)
* H engine (Datsun Roadster?)

Datsun 1000 used one of three varieties of oil cap

* plain blue
* plain blue with Nissan text overlay applied
* Elephant cap

The regular 1000 oil cap is plain blue with a little arrow sticker.
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Datsun B10 Elephant Cap was used in some markets. Apparently the elephant oil cap is a JDM OPTION cap

15255-10651 CAP-oil filler (op.) ALL

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Subtle difference between original and repro caps. The cap on the right has no arrow:
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The following is reportedly from 1000 coupe brochure, but looks very much like an A12. Did they make an updated A10, or is this a prototype Elephant Oil cap for an A12?
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B10 Japan
15255-15852 CAP-oil filler <> 15255-15853
15255-15853 CAP-oil filler (from E/E A10-1550971)
15255-10651 CAP-oil filler (??地仕様) (op.) ALL
15270-11200 PACKING-oil filler cap


Later Nissan replacement caps differ stylistically from the original but work on all 1200 engines.
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Circa 1973 they updated the cap by putting writing on it, and used it for the USA market. Japan did not switch over until April 1978. This replaced the #original plain silver cap.

15255-B3430 CAP-OIL FILLER $12.12
* supersedes 15255-15853/15255-15903/5255-15952/15255-15953
* A-series engine, R16, J13, E-series Engine
15270-B3400 PACKING-OIL FILLER CAP $1.40

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ニッサン モーター オイルを
For Nissan Motor Oil

Fill Occasionally

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1980s Nissan stamped-steel cap
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The 80s cap was eventually replaced with a stylish sculpted version
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I bought a brand new oil cap last year from Nissan Parts Business (Japan) for about $15 USD. It was the gold finish kind. The original plain silver type has been replaced by the gold type.

15255-G8250 - latest version drops the text in favor of an international oil symbol
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