Question: The Y platform, or Y body, designation has been used twice by the General Motors Corporation, the first was for a group of entry-level compacts including the conventional front-engine compacts built by GM divisions Buick, Oldsmobile and Pontiac from 1961 to which year?

Context articles: GM A platform (1982)
General Motors
Oldsmobile
Oldsmobile Cutlass Calais
Oldsmobile V8 engine
GM Y platform
Scraper (car)
SAIC-GM
GM H platform
Buick

The General Motors A platform (commonly called the A-body) was a mid-size car automobile platform designation used from 1982 to 1996.
 Previously the A body designation had been used for rear wheel drive mid-sized cars.
 The Chevrolet Celebrity and platform-mates were introduced in the 1982 model year which were essentially similar in mechanical design and interior space with the troubled X-car compacts, but long enough to be classified as intermediate cars with more traditional styling.
 They were initially offered alongside, but eventually supplanted rear-drive nameplates such as the Malibu for the intermediate niche.
General Motors Company, commonly known as GM, is an American multinational corporation headquartered in Detroit, Michigan, that designs, manufactures, markets, and distributes vehicles and vehicle parts, and sells financial services.
 With global headquarters at the Renaissance Center in Detroit, Michigan, United States, GM manufactures cars and trucks in 35 countries.
 In 2008, 8.35 million GM cars and trucks were sold globally under various brands.
 GM reached the milestone of selling 10 million vehicles in 2016.
 Current auto brands are Buick, Cadillac, Chevrolet, GMC, Holden, and Wuling.
 Former GM automotive brands include McLaughlin, Oakland, Oldsmobile, Pontiac, Hummer, Saab, Saturn, as well as Vauxhall, and Opel, which were bought by Groupe PSA in 2017.
Oldsmobile was a brand of American automobiles produced for most of its existence by General Motors.
 Olds Motor Vehicle Co. was founded by Ransom E. Olds in 1897.
 In its 107-year history, it produced over 35 million vehicles, including at least 14 million built at its Lansing, Michigan factory.
 When it was phased out in 2004, Oldsmobile was the oldest surviving American automobile marque, and one of the oldest in the world, after Daimler, Peugeot and Tatra.
The Oldsmobile Calais, renamed the Cutlass Calais for 1988, and briefly available in 1987 as the limited edition GMO Quad 4, is a compact car that was produced by Oldsmobile from 1985 through 1991.
 In part, it was intended to replace the Omega in Oldsmobile's lineup.
 It shared the GM N platform with the Pontiac Grand Am and the Buick Skylark/Buick Somerset and was replaced by the Oldsmobile Achieva in 1992.
 During this time, Oldsmobile also produced two other Oldsmobile Cutlass models, the Oldsmobile Cutlass Ciera and Oldsmobile Cutlass Supreme, each on its own platform.
 The 1985 Calais, named for Calais, France, was chosen to be the Indianapolis 500 Pace car that year; it was driven by actor James Garner.
The Oldsmobile V8 refers to a series of Oldsmobile engines beginning with the advanced 1949 Rocket which was, along with the 1949 Cadillac V8, the first post-war OHV V8 engines produced by General Motors.
 Like all other GM divisions, Olds continued building its own V8 engine family for decades, finally adopting the corporate Chevrolet 350 small-block and Cadillac Northstar engine only in the 1990s.
 All Oldsmobile V8s were manufactured at plants in Lansing, Michigan.
The Y platform, or Y body, designation has been used twice by the General Motors Corporation to describe a series of vehicles all built on the same basic body and sharing many parts and characteristics.
 The first was for a group of entry-level compacts including the conventional front-engine compacts built by GM divisions Buick, Oldsmobile and Pontiac from 1961 to 1963.
 The second, and current, incarnation is used for a high-end rear-wheel drive automobile platform from the 1980s through the 2000s.
A scraper is an informal term to describe a modified American-made luxury/family car, usually a General Motors model from the 1980s to current vehicles, typically enhanced with after-market rims.
 Scrapers are popular in the San Francisco Bay Area of Northern California, usually associated with the hyphy music and lifestyle movement.
 An example of hyphy is shown in the E-40 lyrics "sittin' in my scraper watching Oakland gone wild".
 A scraper is a general description and can refer to a number of different model cars.
 Popular models include the Buick Regal and LeSabre, Pontiac Bonneville, Buick Century, Oldsmobile Delta 88, Buick Riviera, Buick Reatta, Oldsmobile Cutlass Ciera, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, Lexus SC, Chevrolet Caprice Classic, and Chevrolet Impalas, as well as full size conversion vans such as the GMC Vandura.
 Supercharged automobiles are particularly sought after due to their high performance.
SAIC General Motors Corporation Limited (More commonly known as SAIC-GM; ; formerly known as Shanghai General Motors Company Ltd, Shanghai GM; ) is a joint venture between General Motors Company and SAIC Motor that manufactures and sells Chevrolet, Buick, and Cadillac brand automobiles in mainland China.
 SAIC-GM was founded on June 12, 1997 with 50% investment each from each partner.
 SAIC-GM began assembling the venture's first vehicle, the Buick Regal, in Shanghai, China in 1999.
The H Platform, or H-body, name has been used twice by General Motors.
 The 1970s H-body was an inexpensive rear-wheel drive compact automobile platform from the 1970s, used for the Chevrolet Vega and Monza and their derivatives.
 The 1980s H-body was a front-wheel drive full-size car platform, and was the basis for GM's second generation downsized full-size cars, such as the Buick LeSabre/Electra, Oldsmobile 88/98, and Pontiac Bonneville.
Buick ( ), formally the Buick Motor Division, is an upscale automobile brand of the American manufacturer General Motors (GM).
 It has the distinction of being the oldest active American marque of automobile, and was the company that established General Motors in 1908.
 Before the establishment of General Motors, GM founder William C. Durant had served as Buick's general manager and major investor.
 Buick also has the distinction of being the first automobile maker in the world to equip its cars with overhead valve engines, which it did starting in 1904.