AMSOIL Turns me off with their MLM marketing just like AMWAY...... But I noticed yesterday while walking the dog that the NAPA store in town sells AMSOIL........
Mobile Delvac Super 15W-40 is NOT synthetic....... It's dino....
Mobile Delvac 1 5W-40 is the synthetic....... Mobil Delvac 1 5W-40
The Stealership is using Mobile Delvac Super to GMPP service my rig free for a year. I am going to switch to synthetic right after that at approx 10,000 miles - and most likely go Mobil Delvac 1.
If you compare the rating of Mobil dino to Mobil synthetic - they are darn near identical. In fact the dino has less ash. Makes me think continuing to run the non-syn will be just fine. Plus 15W-40 is the recommended oil from GM, and the synthetic only comes in 5W-40 which really is for temps below zero and up. It never gets even near below zero where I operate the beast.
The main reason i would run synthetic besides possibly better protection - would be if it increases MPG. 
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'07 GMC Sierra 2500 4x4 SLE 1. LMM, CC, 6' Box.
LT275/65R-18 Toyo Open Country H/T on Venti V98 18x9 +25mm offset. 50psi front, 40psi rear unloaded.
A.R.E. Canopy, Willmore Stainless Steel Tube Steps, Bed Coating, Bed Mat, Rear Wheel Wells Undercoating, GM Mud Flaps, Stanadyne, B5 BioDiesel, Fumoco Valve, Baldwin Filters.
21 MPG freeway with 4,000+ miles…. 18 MPG freeway when new... up 1 MPG with Stanadyne... up 1 MPG with the cab-high canopy... up 1 MPG after hitting 4,000 miles…..
Last edited by MR SHORTY : 10-25-2007 at 06:54 AM.
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