On another discussion group, a person posted a message saying that he preferred his chosen brand of passenger car motor oil over another because it didn't get as black as the other after 3000 miles. He expressed his opinion that the brand with the lighter oil color after 3000 miles meant that it didn't expire as quickly as the other.
I have no qualifications to comment on the posting mentioned above but nothing I have read suggested to me that there is any merit whatsoever in his conclusion. Any comments?
This is further to my original message on this topic. I think the color of the used motor oil after 3000 miles doesn't really mean anything because when I shifted my previous car over from Pennzoil's regular petroleum based oil to Mobil 1 synthetic, one of the first things I noticed was that the synthetic came out a lot darker at oil chane time.
quote:Originally posted by Islander: This is further to my original message on this topic. I think the color of the used motor oil after 3000 miles doesn't really mean anything because when I shifted my previous car over from Pennzoil's regular petroleum based oil to Mobil 1 synthetic, one of the first things I noticed was that the synthetic came out a lot darker at oil chane time.
[EMAIL] One of the important chemical charecteristics of any engine oil is its ability interact with fuel combustion products and incomplete combustion products and make them unharmful substance and keep them under suspension. While doing this job, engine oil will have to change to black color. So if an engine oil does not undergo to this process, it may not be a good quality type of engine oil. I would also like mention that one should not evaluate oil quality based on oil color alone. A full chemical tests can alone reveal its usefulness
