Well I have a bought new 2007 Prius that has lived its life on Redline 5-30 engine oil and D6 trans fluid. Car runs like new and one of the few rare G2's that does not eat oil. It does not eat oil because it has run very high quality oil all its life and no ring clogging.
No sludging no burning. It has the usual amount of oil at the bottom of the intake they all have.
Check out the throttle body last I cleaned it was 50,000 miles ago.
Here's recent pics of its valve train at 160,000 miles. 5K OCI. I use Redline products on all my cars. This is the only oil that can quiet down this Toyota solid lifter motor that sounds like a broken sewing machine. The zdp pack in it really works great as you can see there is no wear whatsoever on the cam journals. Works great fixing hemi motor lifter tick too I hear.
I see the same results on every engine I have used this product on. There gear oil is the best too.
If I could open up the trans it would look just as clean. All the trans has is a fill & dump bolt no filter. Basically a manual trans.
So yes Redline is very worth it.
Careful, the Super tech users will be along here shortly