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Im over in China and the only Valvoline fully synthetic I can find is Euro formula 5w-40 supersyn. Is there any difference between the USA version vs the Euro version?

Sorry for the lateness, was having computer problems. The car in question is a 1998 Citroen ZX 1.6L 4 cly, right now im in South China. The car is driven at speeds over 100mph for extended periods of time. Also, my car in the States is a 1989 Dodge Caravan with a built up 2.5L turbo and runs...

ahh again---cant type

drive hard--I can type today..

So far, no oil consumption, the reason I am considering it is because im in a hot climate and drive very hard. I have heard to heavy an oil can damage an engine but iv also heard if you hard a heavy oil is best--so im confused....

Is using 15w-50 or 20w-50 in a car that is driven very hard and fast a good idea or can it cause problems from being to heavy? The owners manual recommends 5w-40 but the car also has 120000K miles on it.

Anyone here rebuild engines? If so, I wanted to know if you can tell a significant difference in the condition of engines that have used synthetics vs dino oil?

Thanks for the reply. I can get Amsoil here, but I was worried about it causing oil leaks due to the high mileage of the engine. Im also worried that the previous owner just used whatever cheap Chinese trash oil before, as a lot of people here do, so there could be a sludge issue. I guess I...

Hello everyone, this is my first post but I have been a lurker for quite a while. I was wondering if you all would be so kind as to help me choose oils for a ride I just picked up a month ago. Right now I am in South China near the city of Guangzhou (about 70 miles north of Hong Kong). The...