X2fulsizjeep wrote:I am back to Rotella 15-40 after trying several other brands in our 401s. The synthetic probably works well for an engine with fresh seals but leaks popped up all over when I started trying different brands.
One of my first jobs was working for a motor machine shop. After seeing the inside of an engine that ONLY ever had Pennzoil in it, I have NEVER used it. There was wax build up everywhere that there wasn't moving parts! Oil pan couldn't hold more than 2-3 quarts and the pump had to be pushing some of that crap through the motor.XJChad wrote:I run synthetics also, Amsoil 10w30 and a Napa Gold filter.
Penzoil, Trop Artic, Quaker State are some of the worst to run. They turn into a wax and build up like crazy.
Amsoil, Mobil 1, Castrol, Valvoline, Napa's store brand, and Royal Purple are some of the better oils to run.
Mars wrote:One man's trans leak is another's penetrating oil
Yep! A friends dad bought a truck with about 50k on it. The P.O. ran Penzoil only. He pulled the valve covers and the heads were caked with that crap. He started running Valvoline and it actually cleaned that wax build up out of it. After about 10k.KJ Ryu wrote:One of my first jobs was working for a motor machine shop. After seeing the inside of an engine that ONLY ever had Pennzoil in it, I have NEVER used it. There was wax build up everywhere that there wasn't moving parts! Oil pan couldn't hold more than 2-3 quarts and the pump had to be pushing some of that crap through the motor.XJChad wrote:I run synthetics also, Amsoil 10w30 and a Napa Gold filter.
Penzoil, Trop Artic, Quaker State are some of the worst to run. They turn into a wax and build up like crazy.
Amsoil, Mobil 1, Castrol, Valvoline, Napa's store brand, and Royal Purple are some of the better oils to run.
I usually use Valvoline. Haven't tried synthetic in my FSJs. When I had my KJ, I only used Mobil1.