I'm not a huge fanboy, I use the cheapest oil I can find for my drag car. Why waste extra $$ if the oil gets changed every 12-15 passes. I've read a lot about using the shell oil, and I have no problem doing it. I just have about 20 more gallons of Mobil 1 to use lol

 

I drain the Castrol 30 WT every February. I'll use it for bar oil for next years wood. 10G would be an active year.

 

How did you like the T6? Any issues running the 5w 40 when it calls for 10w-30? I was also thinking of using it in my F150 that calls for 5w-20. A lot of guys in the motorcycle forum I belong to swear by it in their bikes.

 

I use it in all my bikes and come next oil change in my Jeep too. Out of all the different brands and types T6 is definitely my favorite and its readily available most places. Its also nice to be able to justify buying in bulk during a sale because I use it in everything. Obviously motorcycles are different than cars but my Yamaha 175 calls for 10W-30 and when I switched to T6 5W-40 I saw these improvements, easier starting, smoother clutch articulation and shifting, quieter engine overall, and I've noticed that the engine as a whole seems to operate better, so far it hasn't caused any problems because of the different weight.

 

good to see your going to get a elbow adapter.. i swapped over to the 51515 filter and rotella 15w40... but when temps started to dip out here into the 20's... i got a little nervous and drained and filled with mobile1 10w30 and a mobile 1 m1-301 filter...

strange thing is that 51515 was HEAVY even after i let it drain out... worried me for a bit... but i guess its just the soaked media.. (i hope)

It probably wasn't going to hurt anything.. but just gives me the warm and fuzzy on a cold crank you know?

I might even swap over to the delvac or t6...but the zinc worries me with catalytic converters... I did some reading on this.. and it just bugs me..

 

Like it very much. The 4.0L can handle 40 weights just fine and was originally specified with them, over the years the recommendation was changed to Xw30s for emissions and parts chain reasons. If you look at used oil analyses Xw40s show less wear metals. Downside of course is lower fuel economy. If your F-150 calls for 5w20 I would not put 5w40 in it without careful research. The Jeep 4.0L is not a modern design with tight clearances and actually will take 20w50.

Why aren't you using a winter viscosity? 5w should be the only thing anybody runs this time of year if you see snow.

The 51515 is a cellulose media filter with a quality anti drainback valve. It's retaining oil and dirt like it's supposed to. I would not recommend using any filter that is not appreciably heavier after it's removed.

Regarding catalyst poisoning this is a non-issue. Most of today's mixed-fleet oils have the same or less phosphorous (zinc isn't what kills cats) than the oils specified when the XJs were designed and sold. Yes the cat won't last as long as it will on a low-phosphorous SM or SN oil but it certainly won't be worse than the original specification.

Since most of us here use cheap high-flow cats and the emissions tests our old Jeeps have to meet are pretty sloppy in the first place I don't see any issue. However if you have a 2000+ with the mini-cats I can definitely see this as a concern and would not recommend dumpin in whatever fleet oil without research. Those guys are EGGspensive.