Originally Posted By: Dually
Can a good conventional oil like Valvoline(white bottle) with a OCI of 3-5K keep a engine as clean as a synthetic oil?I looked at some of the photos on this site with people using conventional oil with near spotless engines.I have 115,500 on my Jeep and was thinking of going back to the conventional oil. Joe
In a word, yes. Prior to using synthetic, I used VWB for almost 15 years, anything from 3000 to 5000 mile OCI, in vehicles from new to nearly 200000 miles. Never had one oil related issue, and although there was a little varnish under the valve cover in the older vehicles, I can't say if that was there when I bought them used.
UOAs on VWB at 5000 miles in our current vehicles showed it could go further, and the results were every bit as good as what was seen at the same distance for Amsoil and ST Syn.
That said, since you're on Long Island...if you have numerous short trips then synthetic may be better for you.