Hey Zonestar as far as your reports go can you tell us what they say are the best oils? Worst? How is the dealer oil?
Since you ask.
Todays SM motor oils do a very good no matter what brand you buy. If someone was dead set on doing 3000 mile oil changes they could use Wal-Marts house brand and it would be fine. Speaking of Wal-Mart's brand, their oil filters are better constructed then the orange Fram oil filters. There is really no bad SM motor oil now a days. Most dealers buy motor oil in bulk so its no telling what they are putting in your engine. But as long as it is an API SM oil it will do its job. The add pack that is blended with the base motor oil is what makes the oil different now a days.
seems to be one of the favorites due to its reputation. Mobil 1 was reformulated sometime between 2005 & 2006 and the new formula is a blend of Group III and IV oil bases instead of the more expensive Group IV only. The only oil that is mostly Group IV is the 0W40 viscosity and it is good. The other viscosities have shown higher metal wear in engines when compare to the other Group III synthetics. The public thinks because Mobil 1 is the factory fill in so many vehicles it must be the next best thing to white bread. Any manufacture will use a motor oil is given to them free. This was a great idea from the marketing department of Exxon/Mobil.
is another motor oil that is a favorite and it is Group IV. The only negative thing I do not like about RP is it does not meet the new API guidelines of SM oils; its rated as SL. Have you read the back of the oil container? It states to be use in 2004 and older vehicles.
one of the better motor oils available to public. I would try it if I could find at a retail location. Have to buy through mail order and I like to check date codes on the motor oil I buy.
motor oils constantly turns out good oil analysis reports when used in the proper application.
motor oils no mater if you use the regular (yellow bottle) or Platinum (silver bottle) turns in some of the best oil analysis reports on all engines it seems. Engine configuration does not seem to make any difference, good for all four, six, and eight cylinder engines. Pennzoil Platinum is what I use. One of the best add packs in the oil industrial, good price and I can buy everywhere.