I've got my 90K service coming up and am going to use it for the first time. Any reviews? Thanks.

 

I don't but I read a lot on forums about Pennzoil Platinum.

It seems the Platinum is just as good as the other major brands, with the edge to be the one that will clean the engine the most because of particular detergents. However, I would be aware of cleaning a 90k engine that has run mostly on regular oil. It could quickly clog the oil filter.