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Source:  GM TechLink, July 2004: This information applies to 2004 Light Duty Trucks, Corvette and GTO. General Motors Powertrain has made a design change to oil pump to case oil seal on the 2004 4L60E (M30) and the 4L65E (M32). The new... Read More

Subject: Needle Bearings Found In Oil Pan (Replace Rocker Arms)Source: Chevrolet Dealer Technical Service BulletinNumber: 02-06-01-029Models:1998-2002 Chevrolet Camaro, Corvette1998-2002 Pontiac Firebird2002 Cadillac Escalade, Escalade EXT1999-2002... Read More

Service Bulletin #:  05-00-89-072 Date: NA Subject:  Fuel and Oil Additives - Facts and Myths/Maximizing Fuel Economy Model(s): 2006 and Prior All GM Cars and TrucksA Statement About Fuel EconomyAs gasoline prices have increased, the... Read More

Subject: Higher Than Expected Oil Consumption (Replace Rings and Engine Valley Cover)Source: Chevrolet Dealer Technical Service BulletinNumber: 01-06-01-023AModels: 1999-2001 Chevrolet Camaro, 1999-2002 Chevrolet Corvette, 1999-2001 Pontiac Firebird,... Read More

The following service bulletin was issued by Chevrolet in May of 1986 and contains excellent tips for tracking down hard to find fluid leaks which can be applied to all vehicle lines.Subject: Fluid Leak DetectionSource: Chevrolet Dealer Service... Read More

From Jim Ingle, GM Powertrain Engineer (this question was asked in terms of adding Mobil 1 to a ZR-1 after engine break-in):"There is probably more misunderstanding of lubricants and "old wive's tales" about them than any other automotive issue. A... Read More

Subject:  4L60-E, 4L65-E Automatic Transmission Fluid Leak from Oil Pump or Bell Housing Area (Remove Small Burrs on Torque Converter Hub, Pump Drive Slots and Replace Torque Converter Hub-to-Oil Pump Seal Assembly (243)Models:  2006... Read More

By John Hinckley, Corvette Enthusiast MagazineUsed here with permission.Copyright John Hinckley, Corvette Enthusiast MagazineREADER’S QUESTION: My ’69 restoration is about half done; the body is at the painter, and I’ve completed... Read More

Subject: Loss of Oil PressureModel and Year: 1962 Corvette 250 H.P. 327" V-8Source: Chevrolet Technical Service BulletinBulletin Number: TSB #838Section:  VIDate:  October 16, 1962 TO:  ALL CHEVROLET SERVICE PERSONNELIf loss of engine... Read More

Subject:  Oil Pump Suction PipeModel Year:  1955 6-Cylinder EngineDate:  February 8, 1955Bulletin Number: DR-197, Section VI TO:  ALL CHEVROLET DEALERS A new Oil Pump Suction Pipe for 1955 6-Cylinder Engines is now in production... Read More