10W-30 Redline

[Musky Mike]

Does 10W30 Redline have the same film strength at operating temperature as standard 10W40? If I usually use 10W40 in my old truck, would 10W30 Redline be about the same?

 

[ToxicFire]

I would say no.
What 10w40 did you run normally? I'm sure someone on here @Burla would have numbers with difference. I know he helped me comparing oils before

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[HEMIMANN]

Film strength needs to be for high temperature high shear test conditions - otherwise comparisons are meaningless.
https://www.redlineoil.com/10w40-motor-oil
https://www.redlineoil.com/10w30-motor-oil

10W-40 is superior for a single comparable test. Surprisingly, volatility (NOACK) is the same as well. The sole question would be how long the 10W-40 stays in grade prior to sheardown compared to 10W-30. For that, you'd have to ask Red Line.

 

[Burla]

Does 10W30 Redline have the same film strength at operating temperature as standard 10W40? If I usually use 10W40 in my old truck, would 10W30 Redline be about the same?

Some oils don't follow "traditional" thinking. The benefit of 10w30 redline is that this particular formula has no vii's, however 5w30 redline is the better performer in what you are talking about as "thicker" at operating temp and like hemiman says higher hths.

Most people agree that the 30 weight redline's are similar in cSt performance to the 0w40, 5w40, and 10w40, due to the large swing winter rating to weight. I'd suggest look at uoa's at BITOG of the 10w40 you are thinking about, and look at the tons of redline uoa's on the board, most will be near 12 at the end of a run. Kyles just came back from his 6.4, I don't know what his cSt was but you can compare it to the 10w40's and get a more accurate answer. It is most likely the 10w40 will be thicker in the beginning of an interval, but maybe redline would be thicker at the end.

A better question is should you run redline 10w30 in an old truck, I'm not sold on that strategy. I think maybe look at HM oils and maybe 15w40 for an aging truck. Many reasons for this, redline has been known to clean the hell out of older trucks that don't respond well to be that clean. Redline is a good high performance oil for high performance vehicles and as we know vehicles that have perpendicular metal challenges such as lifter issues, but if the old truck is humming along on 10w40 I'm not sure i would mess with it.