Suzuki 4-stroke motor oil

i thinks they run 1030?? i was told to run Honda oil,,, meh, now my honda has suzuki oil, when in bamfield,blend in
 
I had a 2003 140 Johnzuki and it called for 10/40 oil. I used to use Pennzoil 10/40.
 
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from my 90 suzuki 4stroke manual it says to use premium quality 4 stroke motor oil, SAE 10W-40 and to use only SE SF SG SH or SJ under the API class. system.
 
I think there's some "fear mongering" on the part of the manufacturer's in order to keep selling their high priced product.
I use Castrol GTX in my outboard and have no complaints.
 
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