question po..

toyota casa has been using 5w40 for my vios 1k, 5k, 10k and 15k mileage.. out of warranty na nung nagpa-20k ako kaya sa speedyfix ko dinala.. ginamit nila is 10w40 RP..

is it ok to switch back to 5w40 sa 25k ko (sa April)? i feel like mas ok yung 5w40..

thanks in advance sa reply..