What grade of oil should I choose for a car with a compression ratio of 10.5? How to improve the performance of your car?

My car is a POLO and the compression ratio is also 10.5. I have encountered the same problem as you before. Those who laugh at you don't understand the relationship between engine compression ratio and gasoline grade. They link gasoline grade to car price. Ignore them. I called several experts specifically for this purpose and consulted on this issue. They told me not to believe those pseudo-experts. The following are the suggestions they gave:\x0d\Normally:\x0d\Compression ratio below 8.5, Use No. 90 oil; for cars with a compression ratio between 8.5 and 10.0, use No. 93 oil; for cars with a compression ratio above 10.0, use No. 97 oil. \x0d\If you use power additives:\x0d\For cars with a compression ratio below 10, you can use 90# oil plus power additives;\x0d\For cars with a compression ratio between 10 and 10.5, you can use 93# and 90# Compare between adding additives and choose the most suitable oil solution; \x0d\ For cars with a compression ratio above 10.5, you can use 93# plus power additives; \x0d\ For cars in Europe that require 98# oil, you can use 97 #Add power additives. \x0d\According to experts, it can not only ensure the best power and economy, but also ensure the current high standards of exhaust gas requirements.