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yes if makes your car faster
Although 10W40 can be used, most auto manufacturers recommend 10W30 or 5W30. Check your owners' manual or on the dip stick for correct oil type recommended for your vehicle.
probly 10w40 but it may be lighter like 5w30 if it's a turbo car. you can see what type in your car or call the stealership and askem
General Motors recommended 10w40 synth or semi when the car was built. They then chaged to 5w30. Either should be fine.
It shouldn't hurt anything until you get into the colder months. But, 5w30 is the recommended oil for that car. 10w30 is also a suitable oil down to 0*F.
No, 5w30 is a higher grade so itshould be Ok.
Any premium brand. The weight I cannot tell you as you did not list the year. My 1995 LTC calls for 5w30 weight oil...
5w30 synthetic
10W 30, 5W30 in >32 degree constant weather (winter up north). On a car that old, I'd go with something slightly heavier unless you've had your engine rebuilt recently - 10W40 would be smarter IMO
5w30
you can use castrol 10w40 for this car
Yes, no problem.