what oil should i put in my eclipse ?

Question

i put 5w-30 and someone told me to put 10w-30 in it to help it with some noise's in the engine...should i just buy the 10w-30 and put it in or drain the 5w-30 and then put in the new oil .. ???

it's easier for me if i could just put in the new oil...

and what brand should i buy of oil ?

i used havoline b4 is that good ?

Answer 1

5w30 is usually recommended by manufactures, but the 10w30 is fine also, and better in some cases. You can add the new oil to the old, it's fine as long as they are the same grade and perferably the same brand as there are occasionally compatiability issues with the additives different brands use.

Answer 2

5W30 versus 10W30

Virtually all new passenger vehicles sold in the U.S. use either 5W30 or 10W30 oil. The difference between the two is that the 5W30 flows better when cold, so if you live in a cold climate or operate your vehicle in a cold climate during the winter months, you should use 5W30 if it is the preferred oil for your vehicle. If you live in a sub-tropical climate and don't operate your vehicle in cold climates, then 10W30 is acceptable as long as the manufacturer specifies that it is permissible to use it.


Is there a disadvantage to using an oil that flows better when cold, i.e. 5W30 versus 10W30?

Sometimes, but usually not. The crux of the issue is this: the bigger the difference between the cold oil viscosity and the hot oil viscosity, the more the volume of viscosity modifiers and the less the volume of base stock. If you are good about following the manufacturer's recommended oil change interval then stick with the 5W30 if that is the preferred oil for your vehicle, even if 10W30 is acceptable in warmer climates. Older cars may specify 10W30 only. This is because they need a little more viscosity when cold to keep a protective film on the cylinder walls. There have been instances where the larger amount of viscosity modifiers that are present in 5W30 have broken down due to excessive heat and have left carbon deposits on the valves, but this is extremely rare. The proper fix would be to reduce the excessive heat, but the workaround was to use an oil with less viscosity modifiers.


Why do many oil change places, even dealerships, use 10W30 instead of 5W30, even when 5W30 is preferred?

According to www.cartalk.com (see link in the references section), as well as many mechanics who have posted on usenet, 10W30 is the closest thing to a one size fits all oil. Many older vehicles need 10W30, and most newer vehicles are okay with it in warmer climates. Since many garages don't want to have multiple tanks of bulk oil they choose to carry only 10W30. The advice that Tom & Ray give is correct, 'it would not be a disaster if you used 10W30, but given a choice, go with the manufacturer's recommendation and use the 5W30.

Answer 3

royal purple 5w-30!

Answer 4

Crisco.