Best Synthetic Motor Oil Comparison for 5W-30 A5/B5 Specification NOTE: Before we get into motor oil comparisons let’s look at the “problems” that exist when trying to compare manufacture data head to head…. and then we can understand the “solution” Problem – lack of transparency with ASTM tests NOTE: If there is a test that … Continue reading Best Synthetic Motor Oil Comparison ASTM Test Charts – all compared oils meet A5/B5 Specs