Originally Posted By: Volv04Life
Longest OCI youve done with Penzzoil Ultra? Ive heard its not supposed to be used for more than 4000 miles. Is that true? Would you use it for 7500 or 10000?
In general there are a lot of other factors that can determine how far an oil can be pushed. Driving habits, environment, current condition of the engine, etc. It's possible your situation might be more unique than others. If you really want to know try to quantify it with data and take UOA's at some intervals (7.5k, 10k, etc)
In my 2007 Ford Focus, I've pushed Pennzoil Ultra to 15k with UOA's done at 10k and 15k. My driving style is pretty easy, mostly highway miles, with a daily round trip commute of 45 miles in Colorado(-15F to 95F)