the only time that I have noticed a difference after an oil change this when I put 17000 on Castrol Edge in my Beamer. The other time the transmission started shifting smoother after I did a power steering drain and fill. I don't believe in the butt dyno
Sounds like placebo effects. If maintence on a car is done often then butt dyno is all in the head. Run a car 25,000 mi on dino all in town and change the oil? Well it will seem faster and maybe even faster as the motor is falling apart as you drive down the freeway and all the nuts and bolts you lost caused a stage 1 weight reduction. Followed up by a stage 2 which involved a bank reduction as now you need a rebuild.
Originally Posted By: camrydriver111
The oil that came out of that car looked black.
If lower viscosity oils improve fuel economy, why shouldn't there be an improvement in power?
Less oil drag means less parasitic loss. Whether thinner oil translates to faster lap times let's ask nascar since iirc they use thinner oil for qualifying don't they?
However in the real world I can't say for sure.
A person who spends enough time in their vehicle can certainly tell if something is different. I know I can.