Now i know the most common oil is still 5w30, but so many are moving to 5w20 now, but i keep seeing the major oil brands making their claims on testing Vs. anything, but it's all based on their 5w30 (and they make sure that's noted) for things like sheer/film strength etc.
Have any brands started being more comprehensive? or can 5w20 not make that spec they state?
Have any brands started being more comprehensive? or can 5w20 not make that spec they state?