What is better 5w30 or 10w30?
5w30 is a great multigrade oil for use in low starting temperatures as well as high summer temperatures.
It is also more fuel efficient since it creates less drag on the bearings and moving engine parts.
10w30 is thicker and may provide better sealing capability for older engines..
Should I use thicker oil in an older engine?
A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil — 10W — can help protect worn engine bearings as well.
Which is thicker 10w30 or 10w40?
The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature.
Is it bad to mix 5w30 with 10w30?
Mixing different oils will not improve the performance or efficiency of the engine in any way. The additives in synthetic oil may have limited or no effect at all when mixed with a regular engine oil. … 5w30 and 10w30 are both 30 weight oils and the exact same thickness in your engine when it is at operating temperature.
Is 10w30 better for high mileage?
Both high mileage 5w30 and 10w30 engine oils have the same additives, the only difference is the viscosity at cold startups. Since both oils have the same operating temperature viscosity (30) and additives, they will perform exactly the same. However, 5w30 flows much better than 10w30 during cold starts.
Is 5w30 or 10w30 better for winter?
At operating temperatures, both oils will have the same viscosity (30) and will flow and protect identically. If the oil will be in the engine during winter and you live in a place where it gets cold during these months, use 5w30 oil. If it will only be in the engine during the summer, use 10w30.