Hyundai: oil grade, valve tappets, cam lobes

Question
i own a tiburion (1997) 2.0 liters FX.

i live in a moderate climate 0C (32F) in winter, 35C (95F) in summer.

what is the best oil grade to use:
10W30
10W40
20W40
or 20W50

many thanks

george

Answer
Your best bet is to stick with 5w30 as recommended in the owner's manual.  During the hottest months of the summer you may want to switch to 10w30.

Making sure the oil is the correct weight is important as the oil needs to make it to the top of the cylinder head and lubricate the camshafts as well as provide pressure to keep the valve tappets lifted against the cam lobes.