salam! helo to all

juz want to ask...

1) can i use petronas syntium 800 SM 10W-40 4.0L to replace petronas syntium 800 SL 10W-30? coz during my 1st svc they use syntium 800 SL 10W-30 but have to buy 2 bottle (3.0L & 1.0L)...more expensive instead of using 1 bottle syntium 800 SM 10W-40 4.0L only...

2) are semi synthetic oil sutable for 10K service interval? or i must use fully syn oil only for 10K svc interval?

tq guyz!

solid white CFE CVT PREMIUM AHX85xx