oil question
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Joe28443
Joined: Jul 2009
Posts: 1,163
Likes: 4
From: Hampstead NC
oil question
I know this has probably been answered before but here goes.i just bought a 2001 Ex 7.3 with 143k miles, I am trying to find out which oil to use , synthetic or regular diesel oil? what I have read is the 15-40 rotella, this is my first diesel and I run mobil one in my pick up. I talked to a friend that is a mechanic and he advised me of the 15-40 rotella regular oil and not the synthetic because of the miles and keeping oil pressure. But its a 7.3 with 143k miles and not a gas engine so its not that hurt. Any help will be appreciated. thanks
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
A lot of us use Shell Rotella syn 5w-40.. which your engine will love.. 15w40 will work, but if you experience any loping or romping on cold start ups, i would switch to 5w-40 syn.. Your 143K is not excessive mileage..
Cargo Master
Joined: Oct 2008
Posts: 3,330
Likes: 13
From: Eaton, CO
My experience since I bought the truck... When I bought the truck it had 15W-40 dino in it. I didn't experience any romps on cold starts. It didn't leak oil. I switched to Schaeffer 9000 5W-40 fully synth oil. After the first oil change running that synth. I noticed a leak. It'll leak a little under a half quart every thousand miles. I've been changing it at 6k miles and wanted to go 3 changes before getting an oil analysis. Rotella synth is $19/gal, Schaeffer is $21/gal. Delo and Rotella 15W-40 dino is $10.50 to $11/gal respectively. 5k miles is a good change interval with the Delo and Rotella dino oil. I'm switching back to dino oil today if the weather clears a bit. I'm sure that goes against what most on this forum believe. Our truck is our work truck and I can't justify the business spending double per gallon of oil right now.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
IMHO, you can run syn oil longer to make up the difference in price, and it handles heat and cold better making it better for the motor. I run syn Rotella all year and I really like it, so does my truck. I tried Delo once in a pinch, but I didn't like how my truck sounded no the stuff. Buy 4 gallons of it, and a quart of dino. When you're done with the change, put a little of both dino & syn in your freezer -- you'll be amazed. 
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