AtlasFBG2

Yes both test was Walmarts SuperTech Full Synthetic. From the same jugs. Pretty good oil for $14.50 per 5 quart jug. Got some Rotella Gas truck 5w20 in the engine now. Probably wont test that one. Then I got Pennzoil 0w20 Probably have the Pennzoil tested to see how it compares to the Super Tech.

Grumpy Bear I just got my second test results back a couple days ago. I will post the report here again. The 20 weight oil seems to be holding up good in the 4.3 v6. Both of these reports was a mix of 3 quarts 0w20 and 3 quarts 5w20. My truck has the factory oil cooler which is where the higher copper is coming from. My understanding is most of the 4.3 v6 don't have the factory oil cooler.

Ever consider trying a couple tanks of E85 to see what you could get? Ran my last oil change on only E85 and got a average of 16 mpg over 7460 miles. That was 23 tanks. Cost was $0.14 mile. This oil change I am only using 87 octane E10 and so far getting 20.7 average over 3 tanks. Cost so far $0.13 mile. Using Fuelly .com to track. http://www.fuelly.com/driver/atlasfbg2

Grumpy Bear Here is my oil analysis of my 4.3 v6 using 20 weight oil. Thought I would share it with you since we both used 20 weight oil. I know you posted your results in another thread but they no longer show up. This is a mix of 3 quarts of 0w20 and 3 quarts of 5w20 Walmart Supertech Full Synthetic. No make up oil was added. Used E85 fuel the entire oil change. Currently I am using the same mix of oil but going to use 87 octane E10 fuel this time. Doubt I will see and difference but never know.

Well the `15.7 average is combined city and hiway driving. If the speed limit is 55 i am doing 58-59 and 65 i am doing 68-69. E30 really is the sweet spot. You really dont loose mpg over e10 and the octane is 94 which is a little higher than premium fuel. I made a chart so i could combine e85 and e10 and keep it close to e30 depending on how much i had in tank before refueling. Just kind of a hasle when the station is busy because the e85 is seperate from the other pumps.

Grumpy Bear If the temp is in the mid 70's I can stay in v4 mode up to 64 mph in east or northeast direction. West or south direction about 55 mph is the max it will stay in v4. That little bit of tail wind makes a difference. At the speeds I drive if the temp stays in the 70's or higher all week v4 mode give me 1-1.4 mpg average gain over the course of a tank.

With E85 actual ethanol percentage range between 73% and 80% I am averaging 15.7 mpg. This is with 0w20 oil in my 4.3 v6 which helps to keep it in v4 mode a little more.

If you read his build thread you will understand how he gets 27+ MPG. The truck is lowered, using 0w20 oil instead of 5w30 and never driving over 55mph. It is a regular cab short bed 2 wheel drive. The rest of us 4.3 owners will never see those mpg numbers.

Are those all 5w30 that are listed at top? Here is some specs to compare on new oil samples. These are all 5w30 tested by the same lab. Royal Purple AC Delco Mobil 1 Mobil 1 Supertech AC Delco Quaker State UD Amsoil Sig Series 0w20 0w20 0w20 TBN 9.7 8.0 8.03 8.5 12.8 9.07 8.05 9.53 Vis @ 100 11.0 10.9 11.1 10.1 10.7 8.6 8.51 8.8 Vis@40 62.4 62.0 64.95 55.3 60.5 45.27 44.59 45.97 Vis Index 170 168 164 172 171 171 171 174 Vis@-30 3937 4576 4884 4184 3398 5949 5642 4182 Vol loss 1 hr 10.1 11.3 7.9 8.8 7.6 10.9 12.0 10.7 Calcium 1161 2367 2224 2411 3619 1203 2158 1120 Magnesium 772 9 10 8 19 847 9 789 Phosph 689 706 803 687 701 769 743 709 Zinc 821 838 863 847 809 831 824 730 Moly 85 1 83 58 153 69 81 88 Barium <1 <1 <1 <1 <1 <1 <1 <1 Boron 108 198 248 5 236 235 247 102 Silicon 8 6 4 6 7 8 3 6 Potass 5 5 <5 <5 <5 <5 <5 <5 Manganese <1 <1 <1 <1 <1 <1 <1 <1 Titanium <1 <1 <1 <1 <1 35 <1 <1 Copper <1 <1 <1 <1 <1 <1 <1 <1 Sodium <5 <5 6 <5 5 <5 7 <5 Vandium <1 <1 <1 <1 <1 <1 <1 <1 Silver <1 <1 <1 <1 <1 <1 <1 <1 Aluminum 2 2 2 2 4 <1 <1 2 Chromium <1 <1 <1 <1 <1 <1 <1 <1 Iron <1 <1 1 <1 1 2 <1 <1 Nickel <1 <1 <1 <1 <1 <1 <1 <1 Lead <1 <1 <1 <1 <1 <1 <1 <1 Antimony <1 <1 <1 <1 <1 <1 <1 <1 Tin <1 <1 <1 <1 <1 <1 <1 <1

You guys that drove these 4 cylinders. How often did it go into AFM and drop down to 2 cylinders?

I think all the OEM parts needed to do the conversion are listed in this thread with part numbers. Should be able to order those parts online cheaper than what the conversion kits cost.

If you program with the Hypertech are you able to use the HP tuner to see what changes was made??

I emailed them last week asking about what version is needed for the 2019 trucks. They said 8.6r1 is the current version.

On my 4.3 v6 when it went into v4 mode it could be felt. There was a vibration mainly around 35 mph and 50 mph. I believe the cause of the vibration in v4 was the flapper valve. After changing to a MBRP exhaust the vibration is gone and v4 mode can not be felt anymore.

I raised my Silverado speed limiter to 112mph but rethinking it now after reading this thread. I have had a driveshaft let go once. Don't want to experience that again. It was in a 81 Monte Carlo that had a built 406 sbc 4500 stall converter and 4:56 gears. Ripped a hole in the floorboard and cracked the tranny bellhousing.