this is the test I used when I owned my trucking company. I did this infront of both the Amsoil rep and the Royal Purple rep. I was testing the Amsoil rep's claim that amsoil would reduce engine vibration. I tested Delvac Synthetic (my pick), Amsoil (whatever the rep had brought to show off) and Royal Purple 15w-40 (brought by the local RP rep, I think he actually came from Chicago for this).
We picked a truck at random and drained out its oil and changed its filter (the truck used was a 2003 Kenworth T-600 with a 475 C15 cat)then poured in the Delvac and started the engine and let it run for 20 min. I put a full pack of cigarettes on the driver side steer tire with the hood up and timed how long it took for the pack to vibrate off the tire.
then we drained it, changed the filter, poured in the Amsoil, and repeated the test with the same pack of cigarettes.
Did the same with the Royal Purple. as we gave the engine 20 min warm up time in a temperature controlled environment for all three tests and any argument that the engine was warmer for 1 test than another is moot.
the pack of Marlboro Blend 27 vibrated off the tire in 31 sec with the Amsoil
47 seconds for the Delvac
over 10 min for the Royal purple.
the amsoil rep went home with his head in shame and I continue to use Royal Purple exclusively.
to b fair the times we used was a best of 5 incase air current made changed or the pack didn't get in the exact right spot...... except the the RP because the engine really did just smooth out right away with it.
this is by far a scientific method, but it is a practical real world test.
you tell me that royal purple is from far the best diesel oil or petrol engine..??? I prefer Rotella oil the has your..at same I use in my car every day ....
CHEVRON DELO 400 LE (5w40)(15W-40) (APPROVED BY MFG FOR GAS & DIESEL ENGINES)
valvoline SynPower Full Synthetic Motor Oil
and valvoline racing vr1
I buy quaker state (not the cheapest but not that expensive either) 5w-30 and a Motorcraft filter. oil changes every 5k. I'd go longer but shes got 154k miles on her and it runs at around 2500rpm for 25 minutes on the way to and from work so i figure rather safe than sorry. My step father runs 8000 mile oil changes in his '08 F150 using quaker state and Fram filters.
nice to know oil is just oil. I know walmart tell's company's want they want to pay and company's have to lessen their product quality to make that cost work and some places they really cheap out on quality. So know all their oil atleast is the same. Just to brag my dad takes his 2002 dodge caravan in for an oil change every 10,000 miles (he thinks 3-5 is to short) I cant wait for that thing to die.
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