Oil is oil..... Not really ...... Use synthetic ... Period ..... Why? For all the stated reasons plus one rarely mentioned..... It is cheap insurance if you loose your cooling system . Synthetic will not breakdown at elevated temperatures during this brief temperature excursion . It will save your engine when dyno oil will not . Personally I use Mobil 1 ...... In 30 years it has always resulted in the same outcome. Zero engine problems ..... Zero increase oil burn as mileage piles up . Current cars have > 150 k .
Many synthetics on the market . Mobil 1, Royal Purple , and Amsol are the only true Synthetics .. The rest are technically not syn but ultra refined dyno oils ...... So again oil is not oil . For a few pennies more.... Just stick with Mobil 1 ... And everybody has a Walmart store nearby. .... Right?