Infiniti Q60 Forum - View Single Post - Oil color after 250 miles
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post #5 of (permalink) Old 08-07-2018, 12:07 PM
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Originally Posted by Right.On.Q! View Post
Also, according to one of the oil mfrs, direct-injected motors produce more "soot" than other fuel delivery systems, and that will also turn the motor oil darker.
DI can also cause a higher % of fuel dilution in the oil, which depends on drive cycles, mods (i.e., higher boost levels). In my case, the Used Oil Analysis (UOA) showed 2% fuel dilution in a 5W30 oil after 4500 miles.

Why be concerned about fuel in oil, you may ask? For one thing, it changes the viscosity of the oil. When it was tested, my 5W30 oil was effectively performing as a 5W20 oil with the entrained fuel. If I had been running the 0W20 oil, would the loss of viscosity been similar? I shutter to think about it.

In addition, the "soot" caused by DI can result in carbon deposits on the backside of the intake valves. With that in mind, I'm currently using Valvoline 5W30 Modern Engine Oil, available in a 5 qt. jug at your local Wally World, and using Top-Tier gas (Chevron).
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Last edited by IridiumRS400; 08-07-2018 at 12:13 PM.
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