What is the difference between PB2400 and EPDM in improving the viscosity and index of lubricating oil respectively?

1) uses about 5% tackifier, including ethylene propylene tackifier and chloroprene tackifier. This cost is very low. But also can improve the viscosity index and is suitable for low-temperature start-up.

2) Use 25% high viscosity base oil 500Sb or bright oil 150BS. Because the viscosity of these two base oils is between 24 and 30, they are used for adjustment, but the cost is higher.

1. The brands of oil used in winter are 0W, 5W, 10W, 15W, 20W and 25W respectively.

The symbol w stands for winter, which is the abbreviation of winter.

The smaller the number before W, the smaller the low-temperature viscosity, the better the low-temperature fluidity and the lower the applicable minimum temperature.

2. The brands of oil used in summer are: 20, 30, 40 and 50 respectively. The higher the numerical value, the greater the viscosity and the higher the applicable maximum temperature.

3. The brands of general oil in winter and summer are:

5W/20、5W/30、5W/40、5W/50、

10W/20、 10W/30、 10W/40、 10W/50、

15W/20、 15W/30、 15W/40、 15W/50、

20W/20、20W/30、20W/40、20W/50，

The smaller the number representing the winter part, the larger the number representing the summer part, the higher the viscosity and the wider the applicable temperature range.

You can find the information yourself.

Should be easy to find.