Originally Posted By: GSL
O.K. all of you oil nuts out there! Here is the inside scoop on oil. If your owner's manual says you can use either 0w-20 or 5w-20, then it is O.K..But if your factory manual says only 0w-20, do not use 5w-20 (Unless your vehicle is old & out of Warranty.).The reason is all new vehicles that were designed to run only on 0w-20, is because of newer tighter engine machining tolerances between moving parts[For more efficiency(Power,fuel burn, emissions,less blow-by,etc.)].Thicker oils or additives would mess this up & can{ & has...} cause excess wear & blow out seals(Caused by the oil not being able to get into the very tight machine spaces where it is needed. Also over pressurization at the many delicate seals.). Please note that all same grade oils are not always the same viscosity all of the time, hence why many manufactures request only single multi-grade of oil.
Oh then goodness I had my scooper handy, that was a lot to scoop!
And that's why manufacturer will say for high speed or blah blah situation just higher on viscosity, not 30 wt, not 40, (not even the magical w rating that makes oil thicker lol) just says got up on it.
O.K. all of you oil nuts out there! Here is the inside scoop on oil. If your owner's manual says you can use either 0w-20 or 5w-20, then it is O.K..But if your factory manual says only 0w-20, do not use 5w-20 (Unless your vehicle is old & out of Warranty.).The reason is all new vehicles that were designed to run only on 0w-20, is because of newer tighter engine machining tolerances between moving parts[For more efficiency(Power,fuel burn, emissions,less blow-by,etc.)].Thicker oils or additives would mess this up & can{ & has...} cause excess wear & blow out seals(Caused by the oil not being able to get into the very tight machine spaces where it is needed. Also over pressurization at the many delicate seals.). Please note that all same grade oils are not always the same viscosity all of the time, hence why many manufactures request only single multi-grade of oil.
Oh then goodness I had my scooper handy, that was a lot to scoop!
And that's why manufacturer will say for high speed or blah blah situation just higher on viscosity, not 30 wt, not 40, (not even the magical w rating that makes oil thicker lol) just says got up on it.
