Check me before a make a major investment in several gallons of Mobil Delvac 1300 Super SAE 15W-40. Reason: Currently on sale at O'Reilly Auto Parts Stores. $12.99/gallon; but buy one, get one free. It's been a long time since I've seen any oil at $1.62/quart. I've been using Shell Rotella T and paying $49.99 for a 5 gallon pail.

Question: These two oils are close enough in properties to switch back and forth with no issues, right?

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386