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All oils pass a seal compatibility test as part of their SAE certification. There's not really any chemical difference between most synth and dino oils.

Old Volvos. S70 is a great car to do lots of miles in, mpg is not great though.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: d00df00d</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I don't need "accuracy" to compare two oils.</div></div> This should have been the end...

I have the APR 91, 93 and 100 octane on my VW 2.0 TSI.

My VW is VERY sensitive to octane. I usually BYO to 90-91 but things liven up a LOT on 93. 87 is out of the question. With a $.40c difference between 87 and 93, it's a no brainer. I'd need +10% to break even, or 2mpg. I think I have that. 93 to 89 would be a more appropriate comparo, at...

You want me to admit Edge 5w-30 is thinner than TDT 5w-40? Ok. <img src="http://i15.photobucket.com/albums/a364/AudiJunkie/bitog/TDTvsEdge.jpg" alt="" /> Looks like >10% deviation to me.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BritGerCarLuvr</div><div class="ubbcode-body">Here we are, and I've made a lot of changes & I wish to thank many members of this board for their great advice. I do, however how one more issue for which I need some...

You might like Rotella Synth 5w-40 or Mobil 1 High Miles, 10w-30 or 10w-40. Since you're open to suggestions, try some 2-cycle oil in the fuel at 500:1 (3oz 10g) Add some extra the first time.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: GMorg</div><div class="ubbcode-body">Audi Junkie, if the issue is A3 vs A5 cold viscosity, then why doesn't the graph above that includes GC (A3) and Edge 10W30 (A5) demonstrate the opposite of your position. Doesn't...

Just a reminder, the subject is A5 vs A3, not visc calcs. Maybe you guys should let Shell know their online calc is so fatally flawed. Again, it's not a matter of accuracy, were not launching satellites, it's a tool to make a rough comparison between 2 oils. I have yet to hear a better method...

The honor is all yours.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JHZR2</div><div class="ubbcode-body">Ummm, yeah you do. Plug in a 1 cst difference at 100c and see what it does to your curves. Try a similar error at 40c. Need to work on your math. </div></div> So changing the...

I don't need "accuracy" to compare two oils.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: GMorg</div><div class="ubbcode-body">To be classified as 5W40, the M1 that is graphed above has be be less than 6600 cP at -30C. cP and cSt are measured different ways, but are essentially equal units. So M1 5W40 must...

The graphs are based on logical scientific principles, well-known in the industry. What's speculative is the idea there's a variance from the extrapolated values....YOUR speculation. You have no idea WHICH oil is at a greater or lesser value, do you? For all you know, the oils could diverge even...

[html]<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Trajan</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Audi Junkie</div><div class="ubbcode-body"><div class="ubbcode-block"><div...

<img src="http://i15.photobucket.com/albums/a364/AudiJunkie/bitog/TDTvsEdge.jpg" alt="" />

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Audi Junkie</div><div class="ubbcode-body">Maybe the experts can explain how/why 0w-20 and 0w-50 are the same in the cold, if that's their assertion....hard to tell. </div></div> Just explain it to me like I'm an 8th...

[html]<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Doug Hillary</div><div class="ubbcode-body">Hi, There is nothing wrong in changing lubricants according to the season - it is just not needed if the correct lubricant is chosen in the first place. </div></div>...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Doug Hillary</div><div class="ubbcode-body"> the OP's Thread has been mutilated </div></div> <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BritGerCarLuvr</div><div class="ubbcode-body">...