oil is oil?

[Rustryone]

Is there a differance between shell rotel 15w40 and mobil delvac 15w40. Have always used rotel in my 7.3 ford but the mobil is a good price right now and I havn't changed yet. Don't put many miles on a year(2500), but change every fall.
 

[David G]

I have used both, and use the Delvac now. The 4020 was using a lot of Rotella, and seems to use less Delvac, but could be a fluke.
 

[John730D]

I switch back and forth all the time, even mix them between changes. No problems with 10,000 mile oil changes in my semi.
 

[farmer boy]

I don't think it really matters. As long as it's a decent quality oil it should be fine. I've been using Rotella in the diesels, but wouldn't hesitate to switch to something else.
 

[to_many_irons]

at work we have used about ever thing .
just went from shell to delvac seems good .
keep to good stuff .
lubes and oils should not be cheap .
parts are more !!
 

[guido]

Hello David G,
Not a fluke! The 15w40 Mobil oil seems much better at controlling oil consumption, with better oil pressure as well.
Guido.
 

[guido]

Hello Rustryone,
I have converted (NOT MY TRUCK)from Rotella T to the Mobil 15W40 delvac and found the change to do two things.
Better oil controll, and more oil pressure.
Guido.
 

[greygoat]

I was looking at Shell, when it was on sale,but
the fine print on the jug said, "Filled for
Shell, by Pennzoil"...No Thanks!
When I was rebuilding engines, you could always
tell a Pennzoil engine because it had a grey
waxy sludge inside!
 

[RodinNS]

If the Delvac is the same as Esso/Exxon XD3... then you won't find a better oil as fas as I'm concerned. I don't think you're really going to find much of a change one way or the other myself.

Rod
 

[scotc]

Pennzoil bought Quaker State and was bought out by Shell. All one company now.
 

[buickanddeere]

Check the fine print on every little spec.