okay searched tons of times on here and cant find anything.. i hear of people running diesel oil apparently its high in zinc. has anyone ever run say valvoline premium blur hd in there xj?

 

True, the diesel engine oil has more zinc than the newer gas engine oil. The zinc is being taken out because it is said to ruin the cat converters on todays vehicles. I've heard Royal Purple has more zinc in it, but I could not verify that.

 

ok how about this valvoline vr1 it says right on their website high in zinc and phosphorus. im not worried bout my cat since it doesnt have one bought it that way

 

Diesel oil is too thick, stick with a normal XXW30 or XXW40, the fourty will have a higher zinc content than xxw20/xxw30. Our flat tappet cams like the xxw40 the most.

 

A diesel 15w40 is no thicker than a gas engine 15w40. But 15w40 may be too thick for the winter in your area.

 

VR1 is high in zinc, but it is low in cleaning agents. its intended as a racing oil. Racing engines don't normally see extended usage like a regular vehicle motor. So it would depend on what your usage is, but a short OCI would be recommended.


And for the record, it was the phosphorous that the EPA objected to.

 

I just tried running Rotella 15w-40 for the first time, when I opened the gallon jug it surprised me how DARK that stuff is, looks almost like used oil. I'm broke right now, I bought the Rotella 'cuz Wallyworld has it on sale for $11/gallon in my area (KS), I've always run Castrol GTX with a quart of Lucas and it's always seemed to work well for me, so far the Rotella seems to be working fine, just thought I'd share my experience running "diesel" oil.

 

Rotella is good oil, you shouldn't worry about using it.

 

Wouldn't worry about lower levels of zinc in motor oil. Zinc has been replaced with other additives that do just as good. Besides, spring pressures are so low in the 4.0, it's a non-issue.

 

awwwwwwwwwwwwww god again

 

Oh c'mon rich, you're no fun, u love a good oil thread and u know it. LOL

 

so are all these guys running diesel oil the same ones with blown motors it the tech section i run castrol high mileage oil for 10 years and i live in florida where it gets fin hot as hell here never had any probs

 

No, those are the ones that run no/low oil, never check/change it and want to know why the coolant is brown/lumpy. LOL