question, would chevron superme 10/40 be ok to use in summer {120-phx.,pulling trailer,short time,say 400 miles,??? total miles 3000! OR use 10/30? thank's

What type of vehicle are you pulling with? Engine oil cooler, extra (external) tranny cooler?

Right now, if I were pulling anything here in the MidWest (105 F min today ) I would go with a full synth 10W30 or a 15W40 Blend.

And bring at least one extra spare tire with you!

I agree with Molekule, a good 10w30 or 15w40 would be the better choice, as it would have less VII than 10w40 would.

Patman

More that once you've stated 10w40 has more VII than 10w30.

That might be true in some cases but I doubt it's true in all cases.

Does Redline or Amsoil 10w40 have more VII than Maxlife 10w30 or Shaefers 15w40? I don't know. I'd hope the best full syns in the 10w40 grades have less VIIs than a dino 10w30 or blend 15w40.

I doubt I'll ever know for sure.

You are probably right, a good synthetic 10w40 might just have less VII than a conventional 10w30 would have. But at the same time, that same brand of synthetic's 10w30 would then have less VII too.

I guess that's another good reason I'm getting away from the Maxlife. Although based on how well it held it's viscosity after 2300 miles of hard driving I would have to say it probably doesn't have too much VII.

In the original question though, he was referring to a conventional 10w40 though. That would most likely have quite a bit of VII.

It would be nice if there was some way that the technical specs on an oil would list the amount
of VII that they use.

[ July 26, 2002, 08:30 PM: Message edited by: Patman ]

I guess it really doen't matter how much VII an oil has. If it can hold its' grade for the time it's in the engine then that's good enough.

[ July 26, 2002, 09:34 PM: Message edited by: satterfi ]

"Does Redline or Amsoil 10w40 have more VII than Maxlife 10w30 or Shaefers 15w40? I don't know. I'd hope the best full syns in the 10w40 grades have less VIIs than a dino 10w30 or blend 15w40."

I am confident that Redline and or Amsoil 10W40 and for certain the 15W40 AME, has less VII's than does Maxlife 10W30. I attempted to look at the Schaeffer's spec sheet a moment ago, but their site is down for reconstruction, but as I recall, the Schaeffer's 15W40 blend has a good amount of PAO's in them, so the VII level would probably be lower than even for MAxlife 10W30.

Now I really am anxious to get this Maxlife out!

But in the name of science, I will run it the full 6000km (3700mi) interval I intended, just
for a baseline before the switch to Schaeffers. I calculate I should reach this mileage
within a few days of Sept 15.