Engine noise increased after oil change

When my car was running with a total of 10-40 oil, I put castrol 5-40 in oil change. but the car's voice grew louder. whereas castrol 5-40 is a thinner oil, wouldn't it be necessary to reduce the sound? Why do you think it will hurt?

hello my friend makes a sound since it is 5-40 thin oil and can make a little more noise in tupluse vehicle .. i experienced the same problem more loudly, it does no harm to the engine .. the service outlet of the vehicle is 10-40 oil and i use 5-40 oil 10000km 10 -I use 40 oil now .. if I think the vehicle is 307

You should give more information about your vehicle. What engine and mileage count?

my vehicle 307 1.4 hdi 2004 model 89 thousand.

Last year, I had the oil service done in Sevis. The car started to work more loudly. I took it to the service the next day and explained the situation. He adjusted the thing in 2 minutes on the side of the engine and the sound returned to normal.

[QUOTE = pt206] I had the oil maintenance done in Sevis last year. The car started to work louder. The next day I took it back to the service and told the situation. I wonder what he's setting?