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'''[[Oldsmobile]]''' produced three versions of a [[diesel engine]] between 1978 and 1985: a {{convert|350|CID|L|1|abbr=on}} V8 in 1978-85, a {{convert|261|CID|L|1|abbr=on}} V8 in 1979, and a {{convert|263|CID|L|1|abbr=on}} V6 from 1982 until 1985. The engines powered front and [[rear-wheel drive]] vehicles; the 4.3-litre V6 was adapted to both transverse and inline [[front-wheel drive]] applications. Sales peaked in 1981 at approximately 310,000 units, which represented 60% of the total U.S. passenger vehicle diesel market. However, this success was short-lived as the V8 diesel engine suffered severe reliability issues. While Oldsmobile had appropriately strengthened the block, they left the head bolt design and pattern unchanged to enable them to use the same tooling as for the gasoline engines.<ref name=popmech>{{cite magazine | url = https://www.popularmechanics.com/cars/a6599/top-automotive-engineering-failures-oldsmobile-diesels/ | archiveurl = https://web.archive.org/web/20160612081206/https://www.popularmechanics.com/cars/a6599/top-automotive-engineering-failures-oldsmobile-diesels/ | archivedate = 2016-06-12 | title = The Top Automotive Engineering Failures: Oldsmobile Diesels | last = Wojdyla | first = Ben | date = 2011-05-04 | magazine = Popular Mechanics | publisher = Hearst Magazine Media, Inc. }}</ref> Catastrophic head bolt failures were thus legion, as diesel engines have [[compression ratio]]s that are as much as three times higher than a gasoline engine.<ref name=popmech/> The sales and reliability woes were compounded by a decline in gas prices as well as fuel quality issues including large volumes of diesel fuel containing water or foreign particles.<ref name="phr">{{cite web|url=http://www.hotrod.com/features/0408phr-worst-automobile-engines/
==Failures==
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