How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Don 'Mo Lurch' Your Own Que...
Don 'Mo Lurch'
Don 'Mo Lurch', Auto Mech / Electronics
Category: Chevy
Satisfied Customers: 20798
Experience:  Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
Type Your Chevy Question Here...
Don 'Mo Lurch' is online now
A new question is answered every 9 seconds

what kind of oil does my 84 chevy caprice use 107500 original miles

Customer Question

No Comment Added
Submitted: 9 years ago.
Category: Chevy
Expert:  Don 'Mo Lurch' replied 9 years ago.


Since 1980, the preferred viscosities for GM gasoline engines are SAE 10W-30 for the larger engines and SAE 5W-30 for the smaller engines (engines sizes defined later).

SAE 10W-40 is not included in the viscosity chart for 1984 GM gasoline engines, for several reasons, including:

^ Fuel economy with SAE 10W-30 oils is about 1% better than that with SAE 10W-40 oils.

^ SAE 10W-30 oils generally produce less piston and ring deposits than SAE 10W-40 oils. Such deposits can lead to stuck rings and increased oil consumption.

The use of SAE 10W-40 engine oil in a vehicle equipped with a gasoline engine will not automatically void the General Motors Corporation New Car Limited Warranty. However, since SAE 10W-40 engine oil is not recommended for use in 1984 GM
vehicles equipped with gasoline engines, if the use of such oil causes damage, the cost of the engine repair will not be covered by the Warranty. The Warranty does not cover any damage due to the use of non-recommended oils, whether SAE 10W-40 or some other viscosity. In addition, the Warranty does not cover damages caused by the use of oils that do not meet the recommended API quality or SAE viscosity grade.

Related Chevy Questions