Mobil 1 Synthetic 10W-30 okay for an 03 6MT Coupe?

I also have an M1-110 Mobil one filter.

 

If it's cold weather I'd stick to 5-30w as the manual recommends. Use 10-30 only for continous hot weather. The 5-30 is more fluid at cold temperatures. I'd stick to using a stock oil filter. I can't remember if the oil filter you're using has the anti-drainback valve in it. This helps the filter keep oil in it to prevent startups w/o oil or at least that's what it claims to do.

 

The Mobil 1 oil filter does have the anti drain valve..It's the best oil filter when using synthetic oil ...

 

I use M1 5W30 SuperSyn with OEM 15208-9E000 (the non ****ty one)

I could use a higher viscosity since it never gets below 50F here but I figure Ill stick with whats recommended