Originally Posted By: FrankN4
OK....I am referring to the Mobil 1 5W-30 Truck and Sport Utility Vehicle (TSUV) oil. Are you referring to the TDT truck oil?
The MObil 1 web site shows a picture of the bottle with the Starburst in the lower right hand corner. Their web site also says ILSAC GF-4. In the blue band on the back of the bottle it says ILSAC GF-4, API SM, SL/CF. In the doughnut it says API service SM/CF on the top and Energy Conserving on the bottom.
I can't answer for Amsoil. Try Gary or Pablo for more accurate answers about the Amsoil products. I do know that Amsoil claims ACEA A1/A5, IlSAC GF-4. If they don't, and one can prove it, one would own Amsoil.
I was referring to the Mobil 1 5W-30 Truck and Sport Utility Vehicle (TSUV) oil (not the TDT truck oil). I don't see the text "energy conserving formula" or "starburst" anywhere in the specs on the webpage like I do for the regular 5W-30. The starburst on the picture is too small for me to read it, but if you say that is what it says, I believe you. I am not sure that the Mobil 1 specs on the website are all that accurate.
Amsoil uses tricky language when it comes to certification. The say that XXXX 100% Synthetic oil is recommended when the following certifications (ACEA A1/A5, IlSAC GF-4, etc) are required, but don't say that Amsoil 100% synthetics are actually certified (unlike their non-100% Synthetic oils which are certified).