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Sorry, but if you are spending all of that unnecessary money on Royal Purple, and change it every 3500 miles, you are just pissing money away. Going at least to 5000 miles is a more reasonable approach. I use PP Platinum or Ultra with a high quality WIX-XP filter every 5K like clock work. Costs me under $30 for the oil and around $7 for the filter. As was stated by @UnloosedChewtoy ...your money, spend it however you wish
The difference in pumpability (flow) between 0W-20 and 5W-20 is relatively small and isn't really apparent until ambient temperatures are down to around -35C or so, and both oils will be extremely viscous at those temperatures. 0W oils are tested for pumpability using a piece of equipment known as the Mini-Rotary Viscometer at -40C while 5W is tested at -35C. That said, I fully understand you're interest in using 0W-20 if your area regularly sees temps of -35C or lower, but anything above that a 5W will work. A good block heater would help a lot as well. Since both oils are the same grade at operating temperature it's anyone's guess how FCA would feel about using 0W-20 instead of 5W-20.
The odds are extremely low. A simple, inexpensive UOA from labs like Blackstone or Polaris shows the oils grade at operating temperature at 100C (212F) but not the winter rating. To test for the winter rating FCA would have to submit a sample to be tested using either the Mini-Rotary Viscometer or Cold Cranking Simulator equipment which is quite expensive. Obviously FCA can afford to pay for the tests but would they since both are 20 grades at operating temperature, and could they prove the engine was damaged by using the recommended 20 grade viscosity but with a slightly lower winter rating? Who knows.
Amsoil signature series is recommended. Liquid Moly also makes a really good 5/20 full synthetic
All depends on how long you like to keep your vehicles, and how hard you work them. FWIW I am a dealer, but I'm not going to tell someone they have to run AMSOIL or else...just not how I am and not how AMSOIL even wants their dealers to act. I see the benefit to running it and like the reduced maintenance schedule with increased equipment life.
Prepping for a long road trip in a few weeks, I just did my first oil change today with roughly a few miles over the 2k mark. I used the XL Boosted knowing it’s a good quality oil to protect my baby. I’ve used Amsoil in 2 of my previous Silverado’s.
And pickup their street tacos! Love Costco
Threads on people's experience with their oil changes. You are not alone.
Their oil is very good...I would have no issues using it. People that are spending ridiculous money on high-end oils are crazy IMPO. They truly will not do any more for any your engine than the cheaper quality fully synthetic oils. If you want to go 12K - 20K miles before an oil change, now that may be another story. However, great quality oils are cheap enough that changing your oil every 5000-7500 miles certainly cannot hurt and I just can't get myself to trust going beyond 10K regardless of what any oil manufacturer may say.
