Clarity should not be lacking for something as basic as how much oil to pour in when changing the oil and filter.
I have on order the official service manual and a '94 owners manual that might answer some questions. Or possibly raise more questions.
The B234 was created in 1990 by increasing the bore of the B202 engine from 78 mm to 90 mm. Then the engine was revised in 1994. I don't know what exactly was revised or why, but changes were made to the oil sump system, head, timing cover, and bell housing pattern. The block went from angled to straight. 1994 was when the dry 2.3L engine's oil capacity excluding the oil cooler increased from 4.3 to 5.5 liters.
All 9k's with 2.3L engines made between '94 and '98 have the same engine oil capacity. There is no apparent reason for the variation in what the owners manuals say about how much oil to add when changing the oil and filter.
Here is a recap of what I think the USA owners manuals say about 2.3L engines. I know for sure what the '96 and '98 manuals say because I have hard copies. Because of a number of comments on this board I'm very confident about what the '97 manual says. I'll start with the '93 manual as a reference point. Half of these manuals have incorrect conversions between liters and quarts.
The '93 manual says add 4.3L, 4.4 Qt (the conversion is incorrect)
The '94 manual says add 5.1L, 4.4 Qt (the conversion is incorrect)
The '95 manual says add 4.7L, 5.1 Qt (the conversion is incorrect)
The '96 manual says add 4.7L, 5.1 Qt (the conversion is incorrect)
The '97 manual says add 5.0L, 5.4 Qt (the conversion is incorrect)
The '98 manual says add 4.7L, 5.0 Qt
One of the '94 revisions was the oil pan. The old oil pan part numbers 9117029 and 9133158 were superseded by 30540514 which fits '86 - '93 9k's with both the 2.0L and 2.3L engines. The '94 - '98 models with the 2.3L engine have oil pan 9144023. I assume but don't know for a fact that the new oil pan accounts for much of the 1.2 liter oil capacity increase that started in 1994.
I saw a mention somewhere that people racing these cars were getting oil pressure drops during sweeping left hand turns because centrifugal force prevented sufficient oil from returning to the sump. That would be a good reason to make changes.
The dipstick tube apparently didn't change. I think part number 8787707 applies to all 2.3L engines and possibly also to some 2.0L engines.
All 2.3L engines from 1990 through 1994 had dipstick part 8787731. The '95 - '98 models have dipstick 9170655. I know there has been some discussion about whether the lengths of 9k dipsticks have varied over the years. I believe that only the color of the cap has changed, from black to yellow. Perhaps someone who has both an early generation 9k and a late generation 9k can advise whether there are any differences other than the cap color and stamped part number.
If only the color of the dipstick cap changed in '95 then we can understand why adding 5 quarts fills it to about the X in MAX on the dipstick. The owners manuals and hands-on experience arguably have been more reliable than the dipstick for owners of '94 - '98 9ks.
->Posting last edited on Fri, 9 Feb 2018 13:37:28.
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