Penzoil is practically the worst motor oil out there. I dare say it is the single WORST name brand oil available on the market.

Let me state that I do use some oils that would be classified as "botique oils" but I don't use them for everything. I use Royal Purple or Red Line for gear oils in my rear ends and transmissions and my dad loves Amsoil for motorcycle use.

For day to day use, I use the Ford Motorcraft oil in my Fords and Mobile 1 synthetic for my mom's benz. I know Mobile 1 isn't as good as it use to be but its still a [censored] good oil by compairison.

Castrol GTX or synthetic isn't bad, I have friends that swear by it and havn't found any problems when they have torn down a motor. Shell Rotella T is good stuff for motors with lots of load on them. A friend of mine uses it in his work trucks. I'm not sure if that oil is better suited for a desil motor or not.... I can't remember. I've never heard of any problems with Valvoline but I havn't looked.

If you change your oil every 2500 miles with regular penzoil you will be ok, leave it in for 4000+ miles regularly and I would be shocked if you didn't have sludge in your engine block. I've seen what years 5-10 years of penzoil does on the inside of engine blocks in person and it is NOT PERTY.

Bottem line, don't buy this [censored].... it sux.

Flame me if you want but I'm just trying to save yer motor.

It's pretty common when it comes to oils. You get a snap shot of one condition ..and you assign it to the oil brand. You have to ignore millions that used the product and didn't experience the same condition.

Suppose the engine in question was a known sludge engine from Toyota? He's one of the NEVER AGAIN!!!! types. The "never again" isn't necessarily a bad thing ..as long as there's plenty of whatever it is you're finding problem with. Otherwise, you quickly run out of options.

My evolutions on some products is so protracted that I find total dissatisfaction with the new product in terms of either performance or quality ($ value). I then deem it junk. I then go to an alternative item and also find that it's junk ..and that junk is the new standard for quality.

Hated It!