Ford engine oil level indicators (sometimes referred to as a dip stick or dipstick) are identified by basic part number 6750. Ford used two different service part numbers for the indicators used with the 428 CJ and SCJ engine.
|Service Part Number||Engineering Part Number|
The indicator includes a chrome handle and a black plastic plug to close the loop of the handle. The C7OE-A indicator was used from the beginning of production through May 1970, when Ford published TSB article #2322 that describes a new oil pan fill level and a new indicator to properly measure the revised fill level. The Ford Master Parts Catalog describes the dimensions of the C7OE-A indicator as '17.42" shield to full', '18.50" shield to add', and '19.25" shield to end'. Actual measurements taken from the bottom of the shield are a little different as noted below.
C7OE-6750-A and D0OE-6750-C Indicator Comparison
As shown in the previous picture the D0OE-C indicator is marked "ADD 2 ->| ADD 1 ->| SAFE |<- WARRANTY REQUIRES 101-B OIL D0OE-6750-C <oval Ford script logo> M". The markings on this indicator measure 16 5/16" from the bottom edge of the shield to the lower SAFE line, 17 1/16" shield to bottom of ADD 1 line, and 19 3/8" shield to end.
At some point during the 1969 model year the markings on the C7OE-A indicator were revised. The version used during the 1968 and "early" 1969 model year is marked "ADD ᵒ ᵒ ᵒ FULL C7OE-6750-A <rectangular FoMoCo logo> M" (image courtesy of Dale McVicker). The markings on this indicator measure 16 15/16" from the bottom edge of the shield to the lower edge of the highest ADD dot, 18" shield to the lowest ADD dot, and 18 11/16" shield to end.
We haven't been able to identify a transition date or reason for the change. The "later" 1969 and early 1970 version is marked "ADD 2 ->| ADD 1 ->| SAFE |<- WARRANTY REQUIRES 101-B OIL C7OE-6750-A <oval Ford script logo> M" (image courtesy of James Baker).
The markings were revised yet again when a later service part was released. This third version is marked "ADD 2 ->| ADD 1 ->| SAFE |<- WARRANTY REQUIRES SE 101-C OIL <oval Ford script logo> C7OE-6750-A M". The markings on this indicator measure 17 5/8" from the bottom edge of the shield to the lower SAFE line, 18 1/2" shield to bottom of ADD 1 line, and 19 7/16" shield to end.
The service part also has a slight dimple in the chrome handle just above the shield and below the loop. This dimple doesn't appear on the original C7OE-A or D0OE-C indicators.