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5w30 or 10w30
The recommended weight of oil in an older GMC 454 engine is 5 W 30. This oil can be purchased at any auto parts store.
what weight oil for 6.5 engine
DEPENDS ON THE SIZE OF YOUR OIL PAN 5 with the filter change
10w30 synthetic is best
10W30
It depends on what car you have as to what oil would be best for it. All major brands of oil are excellent products. Just make sure you use the exact weight oil that the manufacture of your vehicle recommends and nothing else.
best is 20w40 grade engine oil.
You can use any SAE certified engine oil in your Nissan. The engine oil should be a 10W-30 weight engine oil.
The best engine oils has a strong properties like Cools, Cleans, Lubricates, Seals, Cushions. And for new engine you can use Castrol GTX Engine Oil. Use exactly the weight of oil the manufacture of your vehicle recommends. All major brands are excellent lubricants so the choice is yours. Also use a quality filter and change it with each oil change.
If you accidentally did that then drain the engine oil out immediately and pour in the correct weight oil.
the weight of oil viscosity weight is strictly related to temperature of operation. there is no set rules for it since anew engine will benefit from less dense oil an old wore out engine will not.