QUOTE(J-keyLudacris @ Aug 9 2014, 03:53 PM)
Castrol semi syn.. 10w40 engine oil. Reached 5k change engine oil. the engine oil still look clear... Not like others cars... very black..
Anyway dun use semi sync for 10k.. engine performance will be low.. and harm ur engine.
Actually you don't really measure how long an engine oil can last by the colour of it. If its clear even after 5K, it could mean the engine oil is NOT doing one of its major tasks of cleaning your engine and suspending the contaminants in your engine oil. As a matter of fact, if its an older engine and it still looks almost golden at 5K, I would suspect it might not be cleaning then engine at all....where the heck are the contaminants....
If you use an GOOD engine oil and it turned black after 2K, it could be cleaning your DIRTY engine wondrously and suspending its contaminant in its oil.
Once it goes dark brown or near black, one of a way (not the only means) is to check if your engine oil is still watery. If its getting thicker or in worst case scenario, sticky like thick gravy, then CHANGE it immediately, its a goner. If its a used only in short time span, you either got yourself a extremely lousy lube, its a fake lube or you got bloody dirty engine.
Therefore a GOOD lube can turn dark brown/black after 2-3K sometimes and as long as its still watery, its doing its what an engine oil should do. Of course, if its celup brand or fake ones, no one can guarantee if its working even if its still watery.
This post has been edited by Cavino: Aug 11 2014, 10:20 AM