I just did an OCI with Formula Shell 5W20 conventional oil. Any ideas as to how long it can go (miles) until the next OCI? I travel about 85-90% highway miles.
Formula Shell is a fine oil. I use it exclusively now that I can get it at BJs for about $2/qt during their annual or semi-annual instant savings sale. All highway miles, you can probably easily run it for 5000-7500 miles.
Originally Posted By: HKPolice
Download the PDF, lubeDB misread the 40C viscosity. It's supposed to be 46.5 instead of 35.1, which puts the VI in the high 160s.
Originally Posted By: BlueOvalFitter
Check out this Viscosity Calculator. Very Interesting.
I ran it for 5-6K in both of the Hyundais with no issues. Both cars were mixed driving (mostly in town). I think with the amount of highway driving that you are doing, 6K would be a nice round number.