oil is oil?

Rustryone

New User
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.
 
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.
 
I switch back and forth all the time, even mix them between changes. No problems with 10,000 mile oil changes in my semi.
 
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.
 
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 !!
 
Hello David G,
Not a fluke! The 15w40 Mobil oil seems much better at controlling oil consumption, with better oil pressure as well.
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.
 
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!
 
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
 

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