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I finally worked up to the max recommended interval at 7500 miles. The PU is still performing just as good as it has been. This will probably be my last sample on this car for a while. I'll just continue to keep it on a steady diet of PU 5W-30 and PureOne PL14612 filters at 7500 mile changes.

I am working my way up to the maximum Infiniti interval of 7500 miles. I went 6250 this change (longer than planned due to some family emergencies over the last few months.) It looks like it went fine though, other than viscosity dropping again, but not as much as it did at 4000 miles. My wife...

I was a little worried after seeing other oil analysis with this engine, particularly the Nissan Ester oil. I was very pleased with this though and plan on going to 5000 miles on the current fill, eventually working up to the maximum 7500 mile interval required by Infiniti for warranty coverage...

I just placed an order for an Audi S4 with the 3.0 Liter direct injected engine with factory supercharger. Audi pays for the first oil change at 5000 miles, and then recommends one every 10,000 miles afterward. I will be changing it myself after the first free one, probably at 5000 miles again...

I have a 1988 Chevrolet K1500 with the 4.3L engine and 108,000 miles. I purchased it about 3 years ago strictly for hauling stuff occasionally and for getting around in the snow. It runs and drives great, much better than trucks that we test drove that were several years newer. It does not seem...

I am getting ready to purchase a new Audi S4 and am trying to get my ducks in a row for oil changes. It looks like the GC and M1 "european" oils are the best choice for this engine. Both have the required ratings from Audi and are on the approved list. Where are you finding these oils? I did...