True... I've used Amsoil for many years and have had great results. My daily driver has a hard 280K on it right now... my truck has well over 200 k, and was burning oil, and tired when I switched it over, and I got better gas mileage, better performance, and no more smoke?

And as far as leaks, there is a lot more to it than the rumors would have you believe. Changing to a quality full synth actually will prolong the life of your rubber seals and similar parts, and will to an extent make them playable again.

Yes it lubricates considerably better, so you get less friction, less heat, more performance, can run a much lighter weight (even more performance) and there are numerous other advantages.

I've always used Amsoil, as they have been in the synth business the longest, and have always been the best. Notice how just in the last 5 yrs or so... all the major brands are coming out with some type of synth? Hmmm? why now all of a sudden when Amsoil has been around for 25 years+?

Anyway, truly, it comes down to personal preference, and personal experience. I use it as it's always worked well me, costs me much less per year, keep my cars going for much longer... and so on...

I just have enough miles on the 455 to switch that over pretty soon. IF I ever get the time to get her out and drive her!

If you look into Synthetic oils, I do suggest Amsoil, Redline or Royal Purple. These are the ones that I hear consistantly as being the top dogs, and would be the only ones I'd trust to actually do anything for me. Anything less, and to me, you may as well stick with dyno juice...

Just my thoughts...

Brett - 67 Drop Top 455!