30W non-detergent or synthetic oil is what they need in summer, 10W30 is what they need in cold weather (winter). The reason for using non-detergent oil in a K series is simple "NO OIL FILTER SYSTEM" so you don't want to wash the crankcase and bring back those nasty particles back in your oil, better let them stick where they are.
Now I can give you a long list of good oil brand but the shell Rotella 30W you use is a good one, Mobil Delvac 1630 is another good choice. 30w synthetic are pretty expensive but some guy find them for cheaper at a local boat dealer (Look for the Volvo Penta brand apparently)
Now "IF" you decide to rebuild your engine yourself, add a dial bore gauge to your list of tools already suggested and learn how-to set it and use it, you can get one today for
-$50 and they are enough accurate for mechanical precision spec demand (.001).
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Gilles.
1988 2072 401 54" hyd angled blade
1988 1872 364 snowblower/C50 deck
1976 1650/QA42A blower/44A deck/standby
1976 1450TS/Sleeve hitch/44A deck/in storage
1963 100 (red)/in storage
2010 Kubota 2380-2/42" infinity deck (engine swap)
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