I am not surprised you have that problem with the 10w-30 as 30 weight Mobil1 have that sometimes.
I am however surprised at the 50 weight noise.There are many other good oils out there and otehr issues can play into it.For example Heath shouldnt be too surprised ata nosie after a week+ of sitting that is not uncommon stuff 's just gotta get re-lubed.
Other good oils to try in that price class: Valvoline SynPower 5w-40, Kendall 5w-40, Mobil1 0w-40, Valvoline Durablend 10w-40 ( hi detregnecy and still meets ACEA A3).
One new oil that's real good, even tho its only a 30 weight is Castrol Syntec 0w-30 its real thick for a 30 weight at running temps but still plenty thin at start-up. Kinda like a 0w-35 would be if tehre was such a class.
Also uses >very< hi end lube stock, but ONLY buy if it says ACEA A3 and Made in Germany on back, (they still have old stock which states neither)
Fred..
PS: Also execute a Nico search on "MB229"