JOHN DEERe Model B uses 20-20W oil. Some shock forks do also.
I have an old Hesston Haybine that uses in the hydraulic system.
The W stands for Winter. The oil is 20 weight when cold so it will flow easier, and becomes 50 weight when it is at full operating temperature.
Yes, 20 W 50 motor oil can be used in a 2001 Chevrolet Silverado with a 5.3 liter engine. This oil is great for older model vehicles.
5w 20
The motor oil that is recommended for a 1996 Honda Civic automatic is 5w 20. This motor oil can be purchased at any auto parts store.
5 w 20
Check out this URL: http://www.upmpg.com/tech_articles/motoroil_viscosity/ I believe your question will be answered there.
You must use the manufacturer's recommended weight. Diesels run hotter than automobile engines so you may need a heavier oil. Read your owner's manual. Also at the oil intake, it should list the type of oil needed. It is the weight of the oil that is important. If it requires 20W-40, do not put in 5W-20.
SAE (Society of Automotive Engineering) 20W is a quality (viscosity) of oil. SAE J300 has established eleven viscosity grades, of which six are considered Winter-grades and given a W designation. The 11 viscosity grades are 0W, 5W, 10W, 15W, 20W, 25W, 20, 30, 40, 50, and 60. These numbers are often referred to as the 'weight' of a motor oil. The lower the viscosity grade, the lower the temperature the oil can pass the standard test. For example, if an oil passes at the specifications for 10W and 5W, but fails for 0W, then that oil must be labeled as an SAE 5W. That oil cannot be labeled as either 0W or 10W.
I would use a synthetic 20/50 motor oil
General Motors specifies 5W-20 engine oil for the 4.3 engines.
Needs to be 20W-50. Should use a synthetic as it will reduce your summer temps by about 20 Deg. F.
I would go with the 20 since it's thicker. 20 is NOT thicker then 30. Yes you can use a 30 weight oil with no problems. 20W oil may be recommended in order to achieve maximum fuel efficiency but, using a 5W30 oil will protect the engine better!