Mobil 1 Annual Protection - going for it!

[opas ride]

AMSOIL makes the same claim, 25k under "normal driving conditions"; 20K under "harsh, dirty & dusty conditions". I've been going 20-25K between changes since back in the late 1980's, hardly ever had to ad oil (only when towing a heavy load) & never had a oil related problem using AMSOIL. I usually sell my cars / trucks around 200,000 - 250,000 miles. I'm sure Mobil One is a good oil & will give good service. == there are no rules or regs. on the term "par synthetic" as to how much "synthetic" is in the mix. A drop, a cup, 50/50, who knows? The term "oil is oil" is not true, there's a huge difference between quality name brand oils & no name, auto parts or big box store oils.

I wonder if living in a moderate climate like Florida, Calif, Arizona, etc. has any bearing on how long oils last in engines compared to Michigan and other areas that have cold, long winters?...Just curious as I live in a very cold, damp state that has miserably cold and long winters at times...Regards

[Ewreck]

I wonder if living in a moderate climate like Florida, Calif, Arizona, etc. has any bearing on how long oils last in engines compared to Michigan and other areas that have cold, long winters?...Just curious as I live in a very cold, damp state that has miserably cold and long winters at times...Regards

Excessive heat breaks down oil quicker so colder temps would theoretically help. I'd ask my wife but she's tired of my "oil thread" questions. Cheapest oil and filter money can buy >< most expensive oil and filter money can buy?