At operating temperature 10W30 has the same viscocity of 30W, when engine is cold (Winter) 10W30 has the viscosity of 10 weight which has much more viscosity than 30W at operating temp.
The only problem with using 10W30 is that under extreme conditions (conditions that won't be seen with these engines - extreme heat) multigrade oil can break down. The bigger the multiple from the W number (in this case 10) to the operating temp number (in this case 30) the miore suseptible they are to thermal break down (does not normally apply to synthetics). 10W30 has a multiple of 3 - its a fairly stable oil even. 5W30 has a multiple of 6 and won't stand up as well to high heat as 10W30 which in turn doesn't handle high heat as well as straight 30W.
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