As long as your not having to start the car when its really cold like (-) degrees and as long as your car is not oil pressure sensitive then no big deal.
No
10W-30 or 10W-40
10W-30 or 10W-40 can be used.
10W-40 10W-40
What do you think will happen when you ignore the manufactures recommendations and use a weight of oil they do not recommend? You will have premature internal engine wear. It may take time but you are causing wear. Use exactly what the manufacture recommends.
it needs 10w-40
10w 40 or 10w 50 this is for the southern part of the country
Neither one of these. Your car requires SAE 5w30 weight oil.
No, absolutely not.
SAE 10W-30 synthetic oil.
The user's guide to my 130 series B&S engine (garden cultivator) says: 10W-40 can be used if 10W-30 is not available at your location. So, if you fit to the 10W-30 oil temperature interval then 10W-40 can be used. On the other hand lawnmower is usually used at spring-summer temperatures so why not to use SAE30 oil?
oil can make energy like ,your car needs oil!