there is no universal best oil for a used car. The oil required for your car is specified in the owner's manual, or you can do a Google query on the make and model.
Castrol Motor makes the best engine oil for classic cars. Also, Pennzoil is an good choice for classic cars . Including, Mobil 1 and Amsoil. They are all great sources of oil for classic cars, but Castrol is the number one best oil for classic cars.
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cars
Cars tomove
oil, petrol is oil
Oil is used to fuel cars
If it's new vehicle. Then check owners manual. If it's a used vehicle 10w30 or 10w40 Castrol Motor Oil
For cars, the manufacturer recommended motor oil.
vegetable oil
no
oil
Oil