StrokeThis
The difference between AMSOIL's Series 3000 5W-30 and it's 15W-40 Marine, besides the obvious viscosity, is the additive package. Call AMSOIL at (715)-392-7101 and ask for technical services, they are the ones who know. I do know that Lubzoil, an industry leading maker of oil additives, claims that AMSOIL is the ONLY U. S. manufactorer to use some or their top shelf additives. Even thoe the Series 3000 is a superior oil, I do not use or recommend it over the 15W-40. This is mainly because of price and the great results I and my customers have seen with the 15W-40. The Series 3000 retails at $7. 38 per QT when purchaced by the gallon. The 15W-40 retails at $4. 40 when purchaced by the 10 Qt jug. I have 9 customers running 22 diesel pickups: 12 Fords, 9 Dodges and 1 Chevy. All use the duel remote by pass system, all use oil analysis. One guy Changes every 25,000 mi even thoe his oil analysis has always shown alot more life left in the oil. He feels that he is money ahead at this point. The most his oil, full flow and by-pass filters and analysis and make up oil has cost him is $120. 30 for 25,000 mi. The rest of the guys sample the oil and change the full flow and bypass filters at 25,000 mi and, if the oil is fine, usually run to 35,000 and sample again. The most make up oil any of them has used in 25,000 mi is 6 qts in a Ford , most use only 1 to 3. I use U. S. Oil Chek instead of AMSOIL to do the analysis so there will be no appearance of impropriety. In 122 oil samples of these 22 trucks Iron wear ranged from a low of 18 to a high of 47. Copper from 0 to 36, lead from 2 to 44 and Tin from 0 to 78. All oils had between 25,000 and 45,000 mi on the same drain. So far the only sample that came back recommending an oil change was because of fuel dillution because of a bad fuel injector. The guys that push it the most drain when the TBN hits 5 or lower. We just don't feel that the difference in fuel economy between the 5W-30 and the 15W-40 would ever make up the difference in price. The 5W-30 may last longer, but none of these guys run to the max out of the 15W-40 as it is and none feel they would want to push the 5W-30 any more than the current drains.
amsoilman
In your experiance, do you feel the 5w-30 is cheaper to run?
MichaelT
Using AMSOIL 5W-30 on extended drain intervals will NOT automatically voil a Ford, Dodge or Chevy warranty. I've seen this put to the test.
oilman
Why are you down on the 4 ball Wear test? It was developed by Shell and adopted as an industry standard test by the ASTM. AS for AMSPOIL using the 1800 rpm over the usuall 1200 rpm to the advantage of a lighter oil. AMSOIL did the same thing with motorcycly oils and AMSOIL 20W-50 trounced Golden Spectro's 5W-40 by a wide margin, . 39 to . 65. And when testing AMSOIL's Series 2000 20W-50 Racing oil to Mobil 1 15W-50 racing oil AMSOIL had a . 514 to Mobil's 1. 474 !!! This was the ASTM D 4172 60kg pressure @ 150 C, 1800 rpm for 1 hour. Are you saying at another parameter the results would be reversed? All companies show their products in the best possible light. But I don't know of another oil company that clearly prints the ASTM ytest number and parameters with every one of it's tests, do you?
Sorry for being so long, But I love this subject.
Mr Freeze aka Rudy