Quote:
Originally Posted by spork2367
https://www.mobil.com/lubricants/-/m...pecs-guide.pdf
Notice on every Mobile 1 oil with API certification the recommendation states "Vehicles that require XW‐
XX."
There is not one spot in their product guide that recommends using a viscosity not originally recommended by the manufacturer.
Notice the zinc and phosphorus content on the racing oils...
Again, this whole topic is grayed significantly by the regulations governing oil, fuel economy, emissions equipment, etc. Aviation oil still has or recommends as an additive, Tris(methylphenyl)phosphate (Tritricresyl phosphate). Long banned in automotive oils and with relatively high toxicity, but in a market that is widely unregulated. A market that suffered many of the same issues listed in Hib's articles, such as the ceasing of lifter production by Eaton who's secret sauce recipe for lifters supplied aviation for a long time.
Another good read for those who really want to get into the weeds: https://www.mdpi.com/2075-4442/1/4/132/htm
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Interesting stuff for the engineering types out there. The paper gives a sense of the complexities if tribology, and the difficulty in balancing advantages and disadvantages of various additives for oil manufacturers.
My takeaways: motor oils are not all created equal; stick with what is known to work unless there's good reason not to; the devil is in the details.
Appreciate the reads!
