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Every mom and pop auto performance shop was selling them back in the day, it was like other snake oil products being sold back then, no proof needed , just a clever marketing scheme. The guys running my local performance shop convinced me to buy one, I was gullible enough , more money than...

Just like deer-crossing signs direct the deer where to cross :)

Me too

Everyone wants to think they are getting an improvement on something that costs money

There have been some dyno tests of those devices, they either caused zero gains or small losses. I know on my Honda VTEC cars they had one smaller cam lobe that induced lower rpm swirl in the cylinders to gain some efficiency, but that effect was in cylinder, not just the intake tract ahead...

My guess is that factory motor oil could be conventional, factories go out of their way to save 1 cent on every vehicle produced, it adds up over time. I think most factory transmission fluids (manual tranny) are conventional, along with differential fluids. All of my vehicles have...

So not likely picked up by the butt dyno. I can believe that.

I remember reading some tests done where they switched older cars to full synthetic fluids and they found some power gains on the dyno. I think Royal Purple was a proponent of that testing, often on older muscle cars. Do you think that is still possible today when you dump factory...

I think you are correct, they would be far better off making them for other customers if such business exists. That plant used to build GM Equinox SUV's that sold in the six digits of production. I think the production of these EV vehicles is set at 20,000 a year max, they were down for...

I believe they produce those vehicles just down the highway from where I live. I don't think they are selling or producing very many of them as people are getting laid off at the plant, very low production vehicle.

Thank you for the reply and link to the other thread. It is unfortunate that some owner manual statements can be misleading for owners and you have little to refer to other than that. We try to apply common sense to issues like that, and hope for the best.

I've often heard that your engine can still benefit from faster oil flow at start up , even at 70 degrees F

That is good news, thanks for the reply, then one should be able to run any viscosity that is within reason and not affect operation of the LSD for Torsen units. I think our owner manuals are a bit incorrect as they talk about potential extra noise and vibrations when going from 75w85 to...

Thank you for the reply, that gives me some peace of mind, one less thing to be concerned with and I should be okay to run any thickness I think is reasonable then. Thanks.

I recall when I had my Honda S2000 the engagement of the differential LSD seemed to be affected by different viscosity fluids I experimented with, it was a bit subtle and mostly noticed when taking wide sweeping curves like highway on-ramps. That car spec'd SAE 90 fluid, we tried 75w90...

Oh wow, I never would have expected BMW to be that conservative. Avoiding full load for 1,200 miles must be hard to do on that car :)

Thanks for the info. I'm curious to know what BMW recommends for break-in ?

My Subaru BRZ manual suggested using a 75w90 fluid was okay in place of 75w85, but noted that it might cause more noise. Do you know any way a 75w85 might be less noisy than 75w90 ? , what causes the noise ? I have 75w90 in my BRZ now and it is quiet so far.

That is true, one my car I have the rear diff to consider and the transmission, and brakes to some degree. I agree with you, but I also think the "book" is often designed for a myriad of reasons that encompasses may possible situations when you have so many different owner types buying the...

Thank you for the added info on this topic. I've been a Honda fan for about 30 years, having owned countless of classic Hondas from the good old days, lol. I had the new generation Honda Civic Si a few years ago which was really nice. I would have loved a new CTR but ended up doing...