I'm seeing people post 10W30, 15W50, 20W50. Personally, I wouldn't even recommend them on a higher mileage 1.3L. The recommended oil is 5W30. Use of heavier grades is going to induce a lifter tap, particularly at cold start-up. I learned this the hard way. I'll not put 10W30 in it again. 5W30 - it is!
I've had it explained to me that the 1.3L lifters have an unusually small oil hole that supplies oil to the lifter internals. From there, its commonsense to use the recommended oil.
You might check out this thread.
http://www.suzuki-forums.com/suzuki-...-start-up.html
I just called Priority Suzuki (local dealership) they informed me that they use only 5W20. Go figure!
