Car oil change over!?

im using 5w-30 super synthetic on my car at the moment.


will it be safe on my engine if i pit in 10w-40 super synthetic on my next oil change.


(car is Astra Coupe Turbo)Car oil change over!?
So many oils and so many myths. One person may tell you one thing and someone else will tell you the complete opposite. Remember that the higher the viscosity, the higher the oil pressure and the less the oil flow. Oil pressure is inversely related to oil flow. So if you go thicker than normal then you are reducing the flow of oil in your engine. My opinion is go as thin as your vehicle's handbook recommends eg 0W30 synthetic. Most of engine wear occurs when the engine is cold and started. a 0W oil will be as thin (or rather unthick) as possible when engine starts... a 10W would be thicker so flow will be restricted at start up more than 0W oil. So it might be safe but 5W or 0W would be 'safer' in terms of engine wear. Putting in thicker oil than recommended is more dangerous than putting in a thinner oil. Scientists have spent millions trying to make the oil as thin as possible in normal temperatures whilst preserving the ideal viscosity at operating temperatures.... it begs belief people try to put thicker oil into their car engines!Car oil change over!?
as long as you use motor oil, you should be fine. 10w40 might make the car hard to start if your car is in a cold climate and it presently is cold.





can you find super duper synthetic??
Well one begs to ask the question WHY,what does the manufacturer require for the engine,go with what they require.It probably would not harm it in anyway but why take that chance,inless of course you have lots loot and you like to spend it.
Changing from a light to a heaver oil is not gonna hurt anything now that the weather is warming up.


It will help to protect the engine better in the summer.


If you live in a cold climet be shure you switch back in the winter for better and quicker starts in the cold weather.
Never change the oil away from the manufacturers specifications. The engine is designed and manufactured with very close tolerances and an increase in the cold viscosity will result in abnormal wear to the engine.


I the olden days when an engine was starting to look worse for wear it was recommended that you use a higher viscosity oil to improve the noise levels in the engine on cold start up. However modern engines are manufactured with much closer tolerances and as in your case comes with a turbo.
If it is within the manufacture spec, then use it. Change the filter also. Never mix different oils.
No it will not hurt anything, but 5W is better. Once the engine warms up, 40w is 40w regardless of the cold temp rating (the first number).





Ideally, you'd run a 0W-whatever because over 90% of wear happens at startup. People that go from 5w to 10w, etc are confusing the first and second numbers.





The best advice you can get in general terms is to not listen to ANYONE about oil and use what your manual calls for. Engine oil, computers and vehicles are some of the most widely myth-plagued, falsified topics known to man.





Yes, you can do better than the manual but without more indepth knowledge you are risking waisted money, time and effort.
Crack open the owners manual in the glove compartment for their recommendations of oil viscosity.





Generally speaking 10w-40 is not recommended for anything these days. I read an article recently that 10w-40 non- synthetic has a viscosity problem. It seems that after a very short period of time the oil does not return to a 10w when cold. The additive package tends to thicken the oil as miles are driven.





Please remember that the most wear in any motor happens in the first ten seconds as you start it . The 5w of the viscosity range pumps to the internal parts quicker than a heavier viscosity oil.





That's why your car manufacturer is recommending 5w-30. It will definately cool your motor more efficiently than the 10w-40. Thin oil (adsorbs) heat faster and returns to the oil pan where it cools.





You are making a very wise choice by using the best synthetic you can lay your hands on when maintaining a turbocharged motor. If you have any doubts on the use lower viscoty oils go to: Joe Gibbs Racing Oil on the net. It'll shock you!
You should only use what the owners manual recommends. They tell you to use 5w/10w for a reason. ESP being that it's a turbo car.