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On Castrol's site they proudly list being partnered with the following OEMs (https://www.castrol.com/en_us/united-states/home/why-partner-with-castrol/castrol-oem-partnerships.html): Honda Volvo Ford Jaguar Land Rover Renault/Nissan Subaru Toyota is tied to Exxon-Mobil and BMW switched from...

With the trend toward reducing OCIs compared to years past, combined with the perceived higher quality of synthetic blends these days, why aren't they a more common choice on BITOG? I see tons of people here currently running 5,000 mile intervals, which seems like it would lend itself well to...

Say you have two oils, one blend and one full syn, both are 5W-30 SP gasoline engine oils. The ambient temp is below 5 degrees F. Cold start in the morning. Both of these oils are within the temp range for their viscosity, but does the full synthetic circulate through the oil galleries and up...

I read all the time how so and so company has higher quality base oils than another. My question is, with the Group categories, how much of a range in quality is there between Group II base oils from XOM versus Group II base oils from Shell, etc, etc. Is there really even a difference as long as...

Castrol touts on their high mileage oils a reduced level of phosphorus to protect from catalytic converters poisoning. As the owner of an oil burning car, is this something that all high mileage oils tend to have, or or this actually a valid reason to switch to Edge from PPHM or M1HM?

I know Rotella is a popular choice, but I've been wondering why SOPUS doesn't have a motorcycle oil within their Pennzoil lineup. Looks like that's changing, with a GTL base motorcycle oil hitting shelves anytime now - article says Q1 2023. I'll be giving it a try when the time comes...

Something I've been thinking about a lot lately when it comes to oil is vertical integration versus buyers and blenders. I'm going to pick on Valvoline here as an example. I've used Valvoline products many times over the years, but when you look at the pricing of Valvoline against Mobil and...

E-cores, louvered center tubes, media tears, poor quality anti-drainback valves, wire mesh backing being removed... It seems like every filter I read about, every brand has some type of issue or lowering of the quality of the product. What is still left that isn't just settling? Which brand do...

I have two jugs in my stash right now. One SuperTech 0W-20 HM, and one Pennzoil Platinum 5W-30 HM. Engine is a Honda 3.5 V6. Burns a bit of oil, maybe 6/10ths of a quart every 3,000 miles. Car calls for 5W-20. Mileage is approaching 150,000. I'd like to start running 30 weights for film...

The A/C in my Accord stopped working one day, just overnight. It only blows lukewarm air now. Now, the pulley on the A/C compressor spins freely at all times with the serpentine belt, but the inner portion inside the pulley does not spin with the A/C on nor does it spin even if you try to spin...