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The above are 10 web links talking about non-detergent vs. detergent. Link 10 is from Briggs and Stratton. I believe they have made a few engines and know the proper oil to use.
Here are quotes from link 10.
"We recommend the use of Briggs & Stratton Warranty Certified oils for best performance. Other high-quality
detergent oils are acceptable if classified for service SF, SG, SH, SJ or higher. Do not use special additives."
"Use a high quality
detergent oil classified "For Service SF, SG, SH, SJ" or higher."
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