a synthetic product of liqui moly is preffered over mineral one
uk4455 posted a pic back in posts to see the diff
the synthetic engine oil keeps engine smoother and keeps on optimum lubrication
if u see that pic u can see smoother flow of fluid across engine parts
kiqui moly products are of superior quality
if u r satisfied with LM 20 W50 then in winters im dead sure u will be double satisfied from 5w40 and 10W40 synthetic one;s
becoz they are design to meet winter requirement while 20w50 for summer
please refer to post 449 in this topic for understanding
temp and engine oil